What We Think
November 28, 2025
Working with collections in Java used to involve a lot of boilerplate code—loops, conditions, and temporary variables. But with the introduction of Java Streams, developers gained a powerful way to process data in a declarative, readable, and functional style.
November 28, 2025
Have you heard about the Year 2038 problem? This time-related issue could affect many computer systems in the future. This is because it causes systems to process dates incorrectly, which can lead to errors, unpredictable behavior, system failures or data loss.
November 28, 2025
In software development, writing unit tests is an effective technique for developers to ensure the quality of their source code. There are many popular testing frameworks, such as Cypress, Vitest, Jest, Mocha, etc. In this article, I will guide you through writing unit tests using Vitest, a modern framework that leverages the speed of Vite.
This guide will walk you through, step-by-step, how to write robust unit tests for quite common scenarios in a modern Vue 3 + TypeScript application: get data from API and fetching data to populate a table. Finally, we'll learn how to measure the effectiveness of our tests using Code Coverage.
Assume that we have a page that displays a list of users when opened. The data is fetched from an API.
During the data fetching process, a loading icon is displayed and is hidden once the data retrieval is complete.
The content of the component that displays the user list. To keep this article from being too long, you are free to define the CSS yourself.
<template>
<div class="user-table-container"> <h2>User List</h2> <divv-if="loading"class="loading-message"> <div class="spinner"></div> <span>Loading users...</span> </div> <div v-if="error" class="error-message"> <p>Error: {{ error }}</p> <p>Please try again later.</p> </div> <table v-if="users.length > 0" class="user-table"> <thead> <tr> <th>ID</th> <th>Name</th> <th>Email</th> </tr> </thead> <tbody> <tr v-for="user in users" :key="user.id"> <td>{{ user.id }}</td> <td>{{ user.name }}</td> <td>{{ user.email }}</td> </tr> </tbody> </table> <p v-else-if="!loading && !error" class="no-users-message">No users found.</p> </div></template>
<script setup lang="ts">import { fetchUsers, type User } from '@/services/userService';import { ref, onMounted } from 'vue';const users = ref<User[]>([]);const loading = ref(true);const error = ref<string | null>(null);onMounted(async () => { error.value = null; try { users.value = await fetchUsers(); } catch (e: any) { error.value = e.message; } finally { loading.value = false; }});</script>export interface User { id: number; name: string; email: string;}export async function fetchUsers(): Promise<User[]> { if (!response.ok) { throw new Error('Failed to fetch users from JSONPlaceholder'); } return response.json();}npm install -D vitest @vue/test-utils jsdomimport { defineConfig } from 'vitest/config'import { fileURLToPath, URL } from 'node:url'import vue from "@vitejs/plugin-vue";export default defineConfig({ plugins: [vue()], resolve: { alias: { '@': fileURLToPath(new URL('./src', import.meta.url)) }, }, test: { coverage: { reporter: ['text', 'json', 'html'], }, globals: true, environment: 'jsdom', },})package.json{ "scripts": {......................................................... "test:unit": "vitest", "test:unit:coverage": "vitest run --coverage", "test:unit:ui": "vitest --ui --coverage" }}npm install -D @vitest/uitests folder alongside the src directory that mirrors its structure.import { mount, flushPromises } from '@vue/test-utils';import UserTable from '../../src/components/UserTable.vue';import * as userService from '../../src/services/UserService';import type { User } from '../../src/services/UserService';import { beforeEach, afterEach, describe, expect, it, vi } from 'vitest'; describe('UserTable.vue', () => { // Declare global variables to control the Promise let resolveFetchUsers: (value: User[]) => void; let rejectFetchUsers: (reason?: any) => void; // Configure mock before each test beforeEach(() => { vi.restoreAllMocks(); // Ensure a clean state before each test // Create a pending promise and store its resolve/reject functions. // `fetchUsers` will be mocked to return this promise. const pendingPromise = new Promise<User[]>((resolve, reject) => { resolveFetchUsers = resolve; // Store the resolve function rejectFetchUsers = reject; // Store the reject function }); vi.spyOn(userService, 'fetchUsers').mockImplementation(() => pendingPromise); }); // Test Case 1: Initial loading state it('should display a loading state initially', () => { // Since loading.value is true from the start in the component, // the loading state will appear immediately after mount. const wrapper = mount(UserTable); // Now, the loading state should be present for us to assert expect(wrapper.find('.loading-message').exists()).toBe(true); expect(wrapper.text()).toContain('Loading users...'); // Ensure other sections are not displayed expect(wrapper.find('table').exists()).toBe(false); expect(wrapper.find('.error-message').exists()).toBe(false); }); // Test Case 2: Successful API call and rendering of user data it('should render a table of users on a successful API call', async () => { const mockUsers: User[] = [ { id: 1, name: 'Alice Smith', email: 'alice@example.com' }, { id: 2, name: 'Bob Johnson', email: 'bob@example.com' }, { id: 3, name: 'Charlie Brown', email: 'charlie@example.com' }, ]; const wrapper = mount(UserTable); // Component mounts and fetchUsers starts (pending) // Trigger the Promise to resolve successfully with mock data resolveFetchUsers(mockUsers); // Wait for all Promises to resolve and the component to update the DOM await flushPromises(); // Assert successful outcome expect(wrapper.find('.loading-message').exists()).toBe(false); expect(wrapper.find('.error-message').exists()).toBe(false); const table = wrapper.find('table.user-table'); expect(table.exists()).toBe(true); const rows = wrapper.findAll('tbody tr'); expect(rows).toHaveLength(mockUsers.length); expect(rows[0].text()).toContain('Alice Smith'); expect(rows[0].text()).toContain('alice@example.com'); }); // Test Case 3: Handling API call failure it('should display an error message on a failed API call', async () => { const errorMessage = 'Failed to connect to server'; const wrapper = mount(UserTable); // Component mounts and fetchUsers starts (pending) // Trigger the Promise to be rejected rejectFetchUsers(new Error(errorMessage)); // Wait for the Promise to be rejected and the component to update the DOM await flushPromises(); // Assert error outcome expect(wrapper.find('.loading-message').exists()).toBe(false); expect(wrapper.find('table').exists()).toBe(false); const errorDiv = wrapper.find('.error-message'); expect(errorDiv.exists()).toBe(true); expect(errorDiv.text()).toContain('Error: ' + errorMessage); }); // Test Case 4: Handling an empty array from API it('should display "No users found" if API returns an empty array', async () => { const wrapper = mount(UserTable); // Component mounts and fetchUsers starts (pending) // Trigger the Promise to resolve with an empty array resolveFetchUsers([]); // Wait for the Promise to resolve and the component to update the DOM await flushPromises(); // Assert no user found outcome expect(wrapper.find('.loading-message').exists()).toBe(false); expect(wrapper.find('.error-message').exists()).toBe(false); expect(wrapper.find('table').exists()).toBe(false); expect(wrapper.text()).toContain('No users found.'); expect(wrapper.find('.no-users-message').exists()).toBe(true); }); });import { fetchUsers, type User } from '../../src/services/UserService'; // Adjust path if neededimport { beforeEach, afterEach, describe, expect, it, vi } from 'vitest'; describe('userService', () => { // Variable to store the Spy object for the global fetch function let fetchSpy: vi.SpyInstance; // Runs before each test case beforeEach(() => { // Reset all mocks and spies to ensure each test case is independent vi.restoreAllMocks(); // Create a spy on the global `fetch` function. This allows us to control its behavior. fetchSpy = vi.spyOn(global, 'fetch'); }); // Runs after each test case (vi.restoreAllMocks is already in beforeEach, but can be kept for robustness) afterEach(() => { // Restore the original `fetch` function after the test is done vi.restoreAllMocks(); }); // Test Case 1: Check fetch users successfully it('should fetch users successfully', async () => { // 1. Prepare mock data that `fetchUsers` should return const mockUsers: User[] = [ { id: 1, name: 'Alice Smith', email: 'alice@example.com' }, { id: 2, name: 'Bob Johnson', email: 'bob@example.com' }, ]; // 2. Mock the `fetch` response // `mockResolvedValueOnce` will make this `fetch` call return a successful Promise // with a simulated Response object. fetchSpy.mockResolvedValueOnce({ ok: true, // `response.ok` will be true json: () => Promise.resolve(mockUsers), // The json() function will return the mockUsers data status: 200, statusText: 'OK', } as Response); // Type assertion for Response properties // 3. Call the `fetchUsers` function to be tested const users = await fetchUsers(); // 4. Assertions // Check if `fetch` was called exactly once expect(fetchSpy).toHaveBeenCalledTimes(1); // Check if `fetch` was called with the correct URL expect(fetchSpy).toHaveBeenCalledWith('https://jsonplaceholder.typicode.com/users'); // Check if `fetchUsers`'s return value matches the mock data expect(users).toEqual(mockUsers); }); // Test Case 2: Check throw an error if fetching users fails it('should throw an error if fetching users fails (e.g., HTTP 404/500)', async () => { const errorMessage = 'Failed to fetch users from JSONPlaceholder'; // 1. Mock the `fetch` response to indicate an error (response.ok is false) fetchSpy.mockResolvedValueOnce({ ok: false, // `response.ok` will be false status: 404, statusText: 'Not Found', json: () => Promise.resolve({ message: 'Resource not found' }), // Return JSON for the error } as Response); // 2. Assert that the function throws the expected error await expect(fetchUsers()).rejects.toThrow(errorMessage); // Still check if `fetch` was called expect(fetchSpy).toHaveBeenCalledTimes(1); }); // Test Case 3: Check throw an error if there is a network issue it('should throw an error if there is a network issue (fetch itself fails)', async () => { const networkError = new Error('Network request failed'); // 1. Mock `fetch` to throw an error directly (simulating a network error) fetchSpy.mockRejectedValueOnce(networkError); // 2. Assert that the function throws that network error await expect(fetchUsers()).rejects.toThrow(networkError); // Still check if `fetch` was called expect(fetchSpy).toHaveBeenCalledTimes(1); });});npx vitest .\tests\
npm run test:unit:uinpx vitest .\tests\
Ready to get started?
Contact IVC for a free consultation and discover how we can help your business grow online.
Contact IVC for a Free ConsultationNovember 28, 2025
JavaScript has always been evolving, introducing new features to make coding more expressive, concise, and powerful. One of the most anticipated features slated for ES2025 is Pattern Matching — a powerful tool that enables developers to destructure and analyze data structures more intuitively and declaratively.
In this blog, we will explore what pattern matching is, how it works in ES2025, and walk through practical examples with detailed explanations.
const result = match ("hello") {
case "hello" => "Greeting detected!";
case "bye" => "Farewell detected!";
default => "Unknown message";
};
console.log(result);
// Output: Greeting detected!
Explanation: The match expression compares the input string against each case. When it matches the string "hello", it returns the corresponding message.
const user = { name: "John", age: 30 };Explanation: Here, pattern matching destructures the object and applies a guard condition (
const greeting = match (user) {
case { name, age } if age >= 18 => `Hello, ${name}. You are an adult.`;
case { name } => `Hi, ${name}. You are a minor.`;
};
console.log(greeting);
// Output: Hello, John. You are an adult.
if age >= 18) to decide which branch to execute.
const numbers = [1, 2, 3, 4];
const description = match (numbers) {
case [first, second, ...rest] => `First two numbers are ${first} and ${second}, rest are ${rest.join(", ")}`;
};
console.log(description);
// Output: First two numbers are 1 and 2, rest are 3, 4
Explanation: This example matches an array, capturing the first two elements into variables and the rest into another array using the rest pattern. It then constructs a descriptive string.
const response = {
status: 200,
data: {
user: {
id: 101,
name: "Alice",
roles: ["admin", "editor"],
},
},
};
const message = match(response) {
case {
status: 200,
data: {
user: {
name,
roles: [firstRole, ...restRoles]
}
}
} =>
`User ${name} has role ${firstRole} and others: ${restRoles.join(", ")}`;
case {
status
} => `Request failed with status ${status}`;
};
console.log(message);
// Output: User Alice has role admin and others: editor
Explanation: This example demonstrates matching deeply nested objects. The pattern matches a successful HTTP response and destructures nested properties to extract the user's name and roles.
function process(value) {
return match (value) {
case (x) if typeof x === "string" => `String of length ${x.length}`;
case (x) if typeof x === "number" => `Number with value ${x}`;
case (x) if Array.isArray(x) => `Array with ${x.length} elements`;
default => "Unknown type";
};
}
console.log(process("hello")); // Output: String of length 5Explanation: This example uses guards (
console.log(process(42)); // Output: Number with value 42
console.log(process([1,2,3])); // Output: Array with 3 elements
if conditions) within pattern matching cases to handle different types dynamically.
const shape = { kind: "circle", radius: 10 };
const area = match (shape) {
case { kind: "circle", radius } => Math.PI * radius * radius;
case { kind: "square", size } => size * size;
case { kind: "rectangle", width, height } => width * height;
default => 0;
};
console.log(area); // Output: 314.1592653589793sfsdfsfsfs
Explanation: This example matches on the kind property of a shape object to compute areas for different shapes, demonstrating how pattern matching can elegantly replace switch-case statements handling tagged unions.
The Pattern Matching proposal is still evolving as part of TC39 discussions. While the syntax and features showcased here reflect the current proposal drafts, they may change before final inclusion in ES2025. Developers should keep an eye on official updates and consider using transpilers or experimental flags if they want to experiment early.
Pattern Matching in ES2025 promises to be a game-changer for handling complex data structures with clarity and brevity. It combines destructuring, conditional logic, and expressive syntax to help developers write cleaner, more maintainable code.
As JavaScript continues to evolve, embracing new paradigms like pattern matching will empower developers to solve problems more elegantly. Keep an eye out for this feature’s release and try experimenting with it once available!
[References]
Ready to get started?
Contact IVC for a free consultation and discover how we can help your business grow online.
Contact IVC for a Free ConsultationNovember 26, 2025
For the past few weeks, I feel like I'm seeing the term "AI APIs" everywhere.
People are using them to generate content, summarize text, figure out if a customer review is happy or angry, or even... write code. I haven't actually tried one myself yet, but after reading around, I just kept wondering, "Wait, what's the actual difference between these and the traditional APIs I use every day?"
So, I did a little digging, and here's a quick brain dump of what I've learned so far.
As far as I get it, an AI API is basically a hotline to a pre-trained AI brain.
Instead of calling a traditional API to ask, "Hey, give me the JSON for user ID 5," you call an AI API and ask, "Hey, read this paragraph and tell me what it means." It doesn't just return static data; it returns something that has been processed and thought about.
How it works:
To make this more concrete, I decided to create my own example using Groq’s llama-3.1-8b-instant model and Postman.
POST request to: https://api.groq.com/openai/v1/chat/completionsContent-Type with the value application/json and Authorization with the value Bearer YOUR_API_KEY (replace YOUR_API_KEY with your own API key).
As you can see, I just need to send a question, and the AI will respond in natural language, making it feel like a conversation rather than a dry query.
After looking at a few examples, I'm starting to see why people are so hyped:
Smarter results: You can give it an instruction like, "Write a friendly email," instead of coding a bunch of templates and rigid rules yourself. It gets your intent.
Leaner code: It looks like one good "prompt" could replace hundreds of lines of if-else logic. For example, instead of writing insane regex to parse an address, you just tell the AI, "Get me the address from this text."
Super-fast prototyping: I can imagine spinning up a Proof-of-Concept (PoC) in an afternoon instead of spending months trying to train my own model.
Natural responses: The text it returns sounds human, not robotic. Users would probably love this for chatbots.
Of course, nothing's perfect. Browsing forums, I see other devs seem to complain about the same stuff:
Unpredictable results: This is my biggest worry. The same input can give you slightly different results. What if it "gets creative" and just makes something up that's wrong?
Slow and expensive: Big AI models need big servers to run. A request can take several seconds (not milliseconds), and the costs can apparently stack up fast if you're not careful.
Privacy nightmares: This one's obvious. You're sending your (or your customers) data to a third-party service. You have to be really careful about what you're sending.
Debugging sounds awful: If a traditional API gives you a 500 error, you can check the logs. But if an AI gives you an answer that sounds right but is factually wrong, how do you even start to fix that?
Clearly, there's a trade-off. We're swapping control and reliability for convenience and... well, magic.
If you want to start digging in like me, these are the "hot" names I've seen mentioned most:
OpenAI (GPT-4o / GPT-4o-mini): The big one, seems to be the standard for general reasoning.
Anthropic (Claude): I hear this one is great for creative writing and handling huge amounts of text.
Hugging Face (Inference API): The place to go if you want to tinker with open-source models.
Cohere API: Looks like it's more focused on business/enterprise tasks like summarization.
Google (Gemini API): Google's model, which is apparently a beast at multimodal stuff (text, images, and audio all at once).
Most of these have free tiers to play around with, so I'll probably sign up for one soon just to see what it's like.
I'm still just learning, but one thing is clear: AI APIs mark a major shift in how we think about APIs.
They don't just deliver data. They interpret it.
And maybe... just maybe... that's where backend development is quietly heading. A future where logic feels more like conversation than computation.
Whether you need scalable software solutions, expert IT outsourcing, or a long-term development partner, ISB Vietnam is here to deliver. Let’s build something great together—reach out to us today. Or click here to explore more ISB Vietnam's case studies.
[References]
https://treblle.com/blog/best-ai-apis?utm_source=chatgpt.com
November 25, 2025
Outsourcing fintech development has become a strategic move for financial organizations seeking innovation, agility, and cost efficiency. As the fintech market continues to grow in 2025, more companies are leveraging specialized partners to accelerate product launches, ensure regulatory compliance, and stay ahead of digital transformation trends.
But how do you choose a reliable outsourcing partner? What are the risks and opportunities?
This guide will walk you through the latest market data, the pros and cons of fintech development outsourcing, key factors to consider when selecting a partner, and actionable steps for successful collaboration.
Whether you’re a startup or an established financial institution, use this guide to make informed decisions and unlock new growth with outsourced fintech solutions.
The fintech market is booming, and outsourcing is helping companies keep pace. This section highlights key trends and why fintech outsourcing is on the rise globally.
Fintech Development Outsourcing means delegating fintech software projects—like apps, payment systems, or compliance tools—to an external partner. These specialists bring deep domain knowledge, security expertise, and scalable resources to help you innovate faster and manage costs.
According to Fortune Business Insights, the global fintech market is projected to be worth USD 394.88 billion in 2025 and reach USD 1,126.64 billion by 2032, with a CAGR of 16.2% during the forecast period. (※1)
Another report from Custom Market Insights estimates the market is projected to grow at a CAGR of 16.5% from 2025 to 2034, reaching USD 255.1 billion in 2025 and an estimated USD 1,008.56 billion by 2034.
(※2)
The global fintech market is growing rapidly due to digital and mobile banking, adoption of cloud computing, and API-driven open banking. Advances in AI, cybersecurity, and analytics are driving demand for new financial solutions. With rising competition, outsourcing fintech development to trusted partners is becoming essential to stay ahead.
Many financial organizations are turning to outsourcing due to talent shortages in AI, data, and cybersecurity and the high costs of in-house development. Outsourcing also enables faster launches, scalable solutions, and access to global fintech expertise that would be difficult to develop internally.
Outsourcing fintech development enables financial firms to innovate faster, manage costs, and maintain a competitive edge.
Outsourcing reduces overhead associated with hiring, training, and infrastructure, while offering fixed or flexible pricing models that support budget control.
Companies gain access to experienced fintech engineers skilled in payments, APIs, and secure system architecture without long-term hiring commitments.
Dedicated outsourcing teams accelerate project delivery and help businesses respond quickly to market changes and regulatory updates.
Internal teams can concentrate on strategic growth and innovation, while technical execution is handled by specialized partners.
Fintech outsourcing covers a wide range of services that help financial organizations modernize systems, enhance security, and deliver seamless digital experiences.
Outsourced teams can design and build web or mobile applications tailored to specific financial services, from online banking platforms to investment and lending apps.
Specialized providers develop secure payment gateways, digital banking systems, and AI-driven automation tools. In addition to blockchain-based transaction security and API integrations with traditional financial systems, cryptocurrency solutions are also part of the broader fintech landscape.
Outsourcing partners ensure that products meet key financial regulations such as GDPR, PCI DSS, and AML, implementing strong encryption and data governance frameworks.
Service providers also handle system integration, cloud migration, and continuous maintenance, ensuring scalability, uptime, and efficient performance across all digital platforms.
While fintech outsourcing offers many advantages, it can present certain challenges, especially regarding security, quality, and communication. Here’s how to manage them effectively.
Ensure partners meet global standards, conduct regular audits, and maintain transparent data practices. Strong data encryption, secure cloud environments, and continuous monitoring help prevent breaches and maintain customer trust.
Set clear milestones, KPIs, and QA processes using Agile or DevOps frameworks. Regular progress reviews and automated testing ensure consistent product quality and faster issue resolution.
Select teams with strong English, overlapping work hours, and collaboration tools like Slack or Jira. Encouraging open communication and aligning on shared goals early reduces misunderstandings and builds long-term trust.
Use NDAs, define IP ownership, and verify your vendor’s credentials before signing. Choosing partners with proven financial industry experience further safeguards proprietary technology and sensitive data.
A structured approach to outsourcing helps financial firms select the right partner, reduce risks, and ensure successful project delivery.
The first step is to clearly outline the business objectives, target users, and the project scope. This ensures alignment between internal teams and potential outsourcing partners from the start.
Identify and compare potential providers based on their fintech experience, technical expertise, and client references. Shortlisting helps focus on the partners most likely to meet project requirements.
Review each provider’s past projects and request detailed case studies. This helps assess their capabilities, problem-solving approach, and relevance to your specific fintech needs.
Agree on communication channels, reporting schedules, and project management tools such as Slack, Jira, or Trello. Establishing these early prevents misunderstandings and keeps the project on track.
Begin with a small pilot project to evaluate collaboration, delivery speed, and quality. Monitor progress closely and optimize processes before scaling up to full development.
For organizations seeking a long-term fintech partner, ISB Vietnam (IVC) provides expertise in legacy modernization, core banking portals, and scalable solutions.
Contact us today to learn more and explore collaboration opportunities.
Ready to scale your fintech vision?
Let’s collaborate to build secure, scalable, and future-ready fintech solutions.
Contact IVC for a Free Consultation
ISB Vietnam (IVC) develops professional applications for the Japanese financial market, covering banking, stock trading, and foreign exchange systems. Our teams are skilled in developing detailed specifications and delivering high-quality fintech solutions through secure, scalable, and modern architectures.
Beyond Japan, ISB Vietnam (IVC) also supports fintech development for clients in Southeast Asia and other international markets, providing scalable and secure solutions tailored to regional compliance requirements.
Bank Account System Package Maintenance
Updating and maintaining design documents in Japanese based on the source code of local bank account systems.
Language: COBOL
Foreign Exchange System
Monitoring order status changes and real-time transaction updates in the forex market.
Languages: Java, JSP, JavaScript (AJAX), Oracle 10G
Other Development Examples:
Looking to accelerate your fintech innovation?
From legacy system transformation to next-generation banking platforms, we support financial enterprises aiming for innovation, compliance, and long-term growth.
Contact us today to explore collaboration opportunities.
Ready to scale your fintech vision?
Let’s collaborate to build secure, scalable, and future-ready fintech solutions.
Contact IVC for a Free Consultation
Outsourcing fintech development often raises important questions about cost, security, and project management.
Below are key FAQs that help financial organizations make informed decisions when partnering with a fintech development vendor.
Fintech development outsourcing costs typically range from $30,000 to over $300,000, depending on project size and complexity. Basic apps with simple functions are cheaper, while advanced features like AI insights or fraud detection raise costs.（※3,4）
Conduct thorough research and obtain multiple quotes to ensure the best value. Partnering with vendors in cost-effective regions like Eastern Europe, Southeast Asia, or Latin America can further reduce expenses.
Services like payment solutions, compliance tooling, mobile/ web apps, and legacy modernization are commonly outsourced due to their need for specialised expertise.（※5）
Security is critical when outsourcing fintech development, as applications handle sensitive data like account and transaction details. Choosing partners with strong security practices, clear contractual obligations, open communication, and regular audits helps protect customer data and mitigate risk.
Effective cross-border fintech outsourcing requires clear governance, overlapping work hours, and robust collaboration tools. Setting milestones and KPIs while considering cultural and language differences ensures smooth project execution and successful outcomes.
Ready to take your fintech project to the next level?
Partner with ISB Vietnam (IVC) A trusted software development company with deep experience in banking, finance, and digital transformation.
Contact us today to discuss how we can help you build secure, scalable, and future-ready fintech solutions.
Fintech development outsourcing can serve as a strategic advantage, helping financial companies accelerate innovation, reduce costs, and access specialized expertise.
While ISB Vietnam (IVC) does not work with cryptocurrency, we have extensive experience in legacy system modernization and core banking solutions.
For organizations looking to strengthen their fintech capabilities and build a long-term relationship with a reliable technology partner, contact IVC today to explore how our expertise can support your next project.
Ready to scale your fintech vision?
Let’s collaborate to build secure, scalable, and future-ready fintech solutions.
Contact IVC for a Free Consultation
Data and insights in this article are based on the following sources:
November 24, 2025
Windows messages are integral to the Windows OS’s event-driven design. The OS communicates with your application by sending messages to your windows. These messages notify your app about everything from user actions (mouse, keyboard, etc) to system events (resize, paint, close, etc).
Messages are identified by constants like WM_PAINT, WM_KEYDOWN, WM_CLOSE, etc. Each message can carry additional information packed inside two parameters: wParam and lParam.
When a user interacts with a window, Windows puts corresponding messages in the message queue for your app's thread. The system only creates a message queue for threads that perform operations needing one, such as creating windows.
A thread must create at least one window before starting its message loop, which retrieves and dispatches messages to window procedures. Most applications use a single thread that registers a window class, creates and displays the main window, and then runs the message loop — typically in the WinMain function. The message loop usually uses GetMessage, TranslateMessage, and DispatchMessage to process input and deliver messages to the proper windows.
When GetMessage returns 0, it means your app received a WM_QUIT message — time to exit.
Once a message is dispatched, it’s handled by a Window Procedure, typically called WndProc. This is a callback function where you handle all kinds of messages.
A typical WndProc looks like this:
WM_QUIT message to break the message loop.If your WndProc doesn’t explicitly handle a message, calling DefWindowProc ensures that Windows performs the default processing — like moving, resizing, or closing the window. Skipping this can cause unexpected behavior.
These parameters are message-dependent and often require macros or bitwise operations to extract meaningful data.
For example:
int x = GET_X_LPARAM(lParam);
int y = GET_Y_LPARAM(lParam);
In event-driven programming, the flow of a program is determined by events — user actions, system triggers, or messages passed between components. While frameworks provide predefined messages and events, sometimes you need something more specific: Custom Messages.
In native Windows C++, you can define your own message using an offset from WM_USER or WM_APP:
You then handle it in your window procedure (WndProc):
And to send it:
The PostMessage call queues the message asynchronously, allowing your main thread to continue processing other events.
Understanding the Windows message loop and event handling model is foundational for any Win32 GUI application. While it might feel low-level compared to modern frameworks, it offers fine-grained control and insight into how operating systems interact with software.
If you're building desktop apps on Windows, mastering this will make you a more capable and versatile developer.
Ready to get started?
Contact IVC for a free consultation and discover how we can help your business grow online.
Contact IVC for a Free ConsultationReference:
https://learn.microsoft.com/en-us/windows/win32/winmsg/messages-and-message-queues
https://learn.microsoft.com/en-us/windows/win32/winmsg/using-messages-and-message-queues
November 12, 2025
Thank you.
November 3, 2025
Outsourcing mobile app development has become a proven strategy for businesses looking to bring high-quality applications to market without the overhead of building an in-house engineering team.
But choosing the right partner isn’t just about saving money; it’s about finding a team that understands your product vision and has the software engineering capabilities to make it a reality.
At IVC, we’ve worked with startups and SMEs to deliver scalable, user-centric mobile applications through flexible and transparent outsourcing models.
In this article, we’ll walk you through:
Whether you’re launching your first app or looking to improve development efficiency, this guide will help you make informed decisions and avoid costly mistakes.
Ready to get started?
Contact IVC for a free consultation and discover how we can help your business grow online.
Contact IVC for a Free Consultation
Outsourcing mobile app development means working with an external software company to design, build, and maintain your app instead of relying only on in-house engineers.
This approach gives businesses access to global talent, lower costs, and faster delivery.
The mobile app development market itself continues to expand at a rapid pace. According to Straits Research（※）, the global market is projected to grow from USD 302.1 billion in 2025 to USD 753.34 billion by 2033, with a compound annual growth rate (CAGR) of approximately 12.1%.
This growth is driven by the widespread adoption of smartphones, the deepening reliance on mobile solutions across sectors like banking, financial services, insurance, e-commerce, and healthcare, as well as the overall pace of digital transformation.
At the same time, high development costs remain a challenge. Factors such as operating system or platform choice, feature complexity, and vendor location can create significant cost variations, which can make advanced apps more costly to develop.
For many companies, outsourcing provides a smart solution, which can be seen as a practical and strategic path forward.
Frequent updates to operating systems and the growing variety of devices make it increasingly challenging for in-house teams to keep up. Outsourcing to an experienced partner can help companies stay current without overburdening internal resources.
Ready to get started?
Contact IVC for a free consultation and discover how we can help your business grow online.
Contact IVC for a Free Consultation
※Source: Straits Research – Mobile App Development Market Report
Building apps in-house requires hiring, training, and managing developers—a process that demands time, money, and long-term commitment.
Outsourcing, on the other hand, gives companies access to global talent pools without the overhead. The key difference lies in scalability and flexibility: outsourced teams can adapt faster to changing project needs.
Startups, SMEs, and even enterprises that lack large internal engineering teams often find outsourcing beneficial.
It’s particularly effective for:
From consumer-facing apps like e-commerce platforms and social media tools to enterprise apps for internal workflow management, virtually any mobile application can be outsourced.
Popular categories include gaming apps, fintech apps, healthcare apps, and e-learning apps.
Like any strategic decision, outsourcing has both advantages and challenges.
Understanding these upfront helps you prepare and maximize results.
Outsourcing provides access to skilled developers at a lower cost compared to hiring in-house staff. External partners bring proven experience across industries, accelerating project timelines while maintaining high quality.
Without proper project management, outsourcing can lead to challenges such as unclear requirements, cultural or time-zone gaps, and unexpected delays. Some companies also risk low-quality code if vendor selection is rushed.
To reduce risks, businesses should:
Selecting the right outsourcing partner is the most critical step.
A reliable software company becomes an extension of your team.
When evaluating potential partners, focus on companies with a strong track record and relevant technical expertise.
Look for:
These qualities indicate that the company can deliver quality results and communicate effectively throughout the development process.
Before making your decision, ask your shortlisted companies questions that help clarify their workflow and reliability.
For example:
Asking these questions gives you insight into the company’s professionalism and helps prevent misunderstandings later.
While reviewing potential partners, be alert to warning signs such as:
If you notice any of these issues, it’s best to proceed with caution or consider other options.
Following a structured process helps ensure smooth collaboration and high-quality outcomes.
Start with clear documentation: project goals, target audience, desired features, platform choice (iOS, Android, cross-platform), and budget range.
Agree on tools for communication (Slack, Teams), project management (Jira, Trello), and version control (GitHub, GitLab).
Regular stand-ups and status updates keep everyone aligned.
Track deliverables with milestone reviews. Stay flexible to adjust scope based on user feedback, market shifts, or technical challenges.
At ISB Vietnam (IVC), we prioritize trust, transparency, and business alignment.
Our outsourcing models are designed to empower clients with flexibility and control.
We have delivered mobile apps for a wide range of industries, such as camera control, fintech, education, and utilities. Our team uses technologies like C++, Objective-C, and Java to create effective solutions for different business needs.
With over 100 experienced engineers, we offer end-to-end support, covering everything from requirements gathering to deployment and maintenance. We also have expertise in both global and Japanese markets.
We offer:
Our flexible contracts allow us to adapt to client goals, budgets, and timelines while maintaining quality through agile or waterfall models.
IVC has delivered a wide range of mobile applications for clients across various industries, including finance, education, utilities, and technology.
Below are several representative projects that highlight our ability to deliver robust, user-focused solutions tailored to each client’s needs.
An application enables users to control and view live images on QBiC cameras via Wi-Fi. It also allows users to insert images into MP4 videos or trim clips from them.
Developed for the finance sector, this app supports multi-exchange rates, detailed statistics, and visualization charts.
Users can record their voice and embed it into the original image to create personalized image books. The app also allows uploads to YouTube, browsing and purchasing of voice books, and supports multiple languages including English, Japanese, and Korean.
This app is designed for English learning through drawing, featuring handwriting-based drills and a server-side system to store learning history.
A utility app for Secure Device Management (SDM) users, allowing admins to remotely change app order and helping users launch apps and access shortcuts.
Further case studies and detailed project insights are available on IVC Case Studies.
At IVC, we value long-term relationships with our clients. Reach out to us and let’s create innovative mobile apps that drive lasting value together.
Ready to get started?
Contact IVC for a free consultation and discover how we can help your business grow online.
Contact IVC for a Free Consultation
Have questions about outsourcing mobile app development?
Here are some of the most common inquiries we receive from clients, along with clear answers to help you make informed decisions.
The cost of outsourcing mobile app development can vary widely depending on the app’s complexity, features, and the region of the development team.
For example, in North America, developing a mobile app may cost significantly more than in Eastern Europe or South Asia. A basic MVP might start around $5,000–$50,000, while more advanced or enterprise-level applications with complex integrations can cost over $200,000.
Source: SpaceO Technologies, Aalpha Information Systems
All major platforms can be outsourced, including native apps (iOS, Android) and cross-platform frameworks (Flutter, React Native, Xamarin).
Yes, but it requires careful transition planning. Ensure all documentation, code repositories, and assets are handed over properly to minimize disruptions.
To maintain high quality, choose partners with robust QA practices, regular testing cycles, and clear, transparent communication. Ask for demos, code samples, and client references to evaluate their work before committing.
At IVC, we combine proven QA processes with open communication and end-to-end project support.
Reach out to us to discuss how we can deliver a high-quality mobile app tailored to your needs while building a long-term partnership.
Ready to get started?
Contact IVC for a free consultation and discover how we can help your business grow online.
Contact IVC for a Free Consultation
Choosing to outsource mobile app development is more than just a way to cut costs. It is a strategic decision that can accelerate business growth, improve flexibility, and help you deliver high-quality products to the market more quickly. The most important factor for success is finding a partner who truly understands your goals and brings technical expertise, transparency, and strong communication skills.
At IVC, we believe that successful outsourcing is built on trust, collaboration, and a clear understanding of your business needs. If you are ready to take the next step in mobile app development, talk to our team. We are here to help turn your ideas into reality.
Ready to get started?
Contact IVC for a free consultation and discover how we can help your business grow online.
Contact IVC for a Free ConsultationData and insights in this article are based on the following sources:
November 3, 2025
Struggling to expand your business due to limited internal resources, lack of sales expertise, or a slow lead generation process?
Business development outsourcing is emerging as a cost-effective and scalable solution for companies aiming to grow faster without overloading their in-house teams.
At IVC, we have helped many startups and mid-sized companies grow by providing outsourced sales and marketing operations. In some cases, we also implement customized CRM or workflow tools to improve efficiency and transparency.
In this article, we’ll walk you through:
Whether you’re a startup or an established company, this guide will help you understand how to leverage outsourcing to accelerate growth and stay competitive in today’s global market.
Ready to get started?
Contact IVC for a free consultation and discover how we can help your business grow online.
Contact IVC for a Free Consultation
Business development outsourcing involves delegating sales, marketing, and growth-related tasks to external experts, allowing companies to expand faster while staying focused on core activities.
Outsourcing business development means partnering with an external team to handle activities like lead generation, sales prospecting, and partnership building. Instead of hiring and training an in-house team, companies rely on specialized providers who bring expertise, technology, and proven processes.
Business development outsourcing typically covers functions that require both expertise and scalability, helping companies grow without the heavy investment required to build large in-house teams.
Some of the most commonly outsourced services include:
These services are widely used not only by large enterprises but also by startups and SMEs that need quick access to sales expertise, technology, and market knowledge without overloading their internal resources.
While business development outsourcing was once primarily used by large enterprises, it is now increasingly adopted by startups, SMEs, and fast-scaling companies.
These organizations often face challenges such as limited sales capacity, lack of in-house expertise, and the high costs of building a full internal team.
Outsourcing provides a strategic solution by enabling them to:
For smaller firms especially, outsourcing levels the playing field—allowing them to compete on a global stage, expand their customer base, and focus internal resources on innovation and core business functions.
Outsourcing business development isn’t just about reducing costs; it’s also a way for companies to achieve strategic goals.
According to Deloitte’s 2026 Global Business Services Survey, organizations today appear to be striving for greater efficiency, scalability, digital transformation, and enhanced customer experience. （※）
At the same time, the survey shows that demand for skilled talent remains high, and outsourcing may offer a way to address talent gaps while helping to drive innovation. By leveraging outsourcing, these goals can often be achieved more effectively than by relying solely on in-house resources.
（※）Reference:2025 Deloitte’s Global Business Services (GBS) Survey
Outsourcing allows companies to quickly access experienced professionals, proven strategies, and advanced tools for marketing. Experts can be brought in for areas such as customer acquisition, sales, website development, app development, and after-sales support, enabling businesses to accelerate growth using external expertise without building an internal team from scratch.
Outsourcing reduces the need for large upfront investments in recruitment, training, and infrastructure. Instead, companies can adapt resources as needed, driving efficiency and cost control while focusing their budgets on high-value areas.
External partners bring industry knowledge and market-ready processes, allowing businesses to expand into new regions quickly and scale operations with less friction. This agility supports faster growth in competitive global markets.
By outsourcing lead generation, sales development, or market research, internal teams can prioritize innovation, product development, and customer success. Outsourcing ensures essential functions continue to drive revenue while the company focuses on long-term strategic initiatives.
Understand the common challenges of outsourcing business development and how to manage them effectively.
Clear communication channels, defined processes, and regular check-ins help avoid misalignment. It’s also important to clarify roles and responsibilities upfront so that every team member understands their tasks and objectives.
Setting guidelines, providing training, and monitoring performance ensure brand consistency. Regular audits and feedback sessions can further maintain high standards across all outsourced activities.
Work with partners that follow strict compliance standards and sign NDAs to protect sensitive customer and business data. Implementing access controls and encryption adds an extra layer of protection for critical information.
Use project management tools, set KPIs, and establish regular performance reviews to keep outsourced teams aligned with your goals. Fostering open communication and building strong relationships with the team also helps sustain motivation and accountability.
From outbound sales to CRM support, here are the most valuable outsourced BD services. These services help companies scale their business development efforts efficiently while accessing specialized expertise and technology that might not be available in-house.
Cold outreach, follow-ups, and building qualified sales pipelines. Outsourced teams can help expand your reach more quickly than an in-house team alone, ensuring a steady flow of potential clients.
Content marketing, campaigns, and digital advertising to drive inbound leads. They also allow companies to experiment with new channels and strategies without overloading internal staff.
In many BDO projects, especially in marketing and sales outsourcing, effective management tools are essential to ensure visibility and performance. Depending on the client’s needs, we can assist in selecting, customizing, or even developing these tools.
One example is ISB Vietnam(IVC)’s customization of Odoo, an open-source business suite. We built a system that enables clients to track leads, manage tasks, and streamline team communication across outsourced operations.
Ready to get started?
Contact IVC for a free consultation and discover how we can help your business grow online.
Contact IVC for a Free ConsultationGather insights on industry trends, competitors, and target markets. Regular research helps inform both sales and marketing strategies, improving decision-making and reducing market entry risks.
Appointment Setting and CRM Support
Scheduling qualified meetings and maintaining clean CRM data. Consistent data management ensures your sales team can focus on closing deals rather than administrative tasks.
Beyond outsourcing outward-facing BizDev tasks such as lead generation and appointment setting, many companies also outsource the development of internal business systems to improve overall productivity across their business development departments.
At ISB Vietnam, we specialize in building tailored systems that streamline internal operations, enhance data visibility, and support strategic decision-making.
The following are examples of systems we’ve developed to support business development through internal operational efficiency.
This system was developed for logistics companies to manage shift-based operations. It supports time tracking, calculates profit and loss, handles billing and invoicing, and maintains master data—all essential features for smooth part-time workforce management. It was built using PHP and CakePHP.
Using Odoo Community v8, we created an ERP module to manage sales reporting on a daily, weekly, and yearly basis. It also includes a discount reporting feature for accounting teams and supports data import and master data management. The system was developed using Python, PostgreSQL, and JasperReport.
These two systems were designed to work together: one handles detailed network setting and configuration, while the other streamlines business workflow management. Both systems were built with PHP and CakePHP 3.5.
To support information security risk management, we built a system that maintains a detailed asset registry and offers risk forecasting and monitoring features. This solution was implemented using Java, JSP, and HTML.
Developed for restaurants, this system allows staff to monitor and manage orders via iPads. It integrates both web and mobile interfaces to ensure a seamless customer experience and optimized kitchen operations. Technologies used include iOS7, Objective-C, and PHP.
These systems go beyond simple digital tools, helping businesses reduce manual workload, improve transparency, and remain compliant as they grow.
Selecting the right partner requires clear goals, tools, industry knowledge, and cultural fit.
Be clear about whether you need lead generation, full sales support, or market entry. Defining objectives upfront prevents misunderstandings and ensures measurable outcomes.
Check past clients, success stories, and proven results. This gives confidence that the partner can handle the specific challenges of your market or industry.
Ensure the partner uses advanced CRM systems, automation, and analytics. The right technology stack ensures efficiency, scalability, and accurate reporting.
Successful outsourcing depends on both skills and cultural fit. Aligning values and communication styles ensures smooth collaboration and long-term success.
With extensive experience in the Japanese market, ISB Vietnam (IVC) delivers high-quality work on time while building lasting partnerships and fostering trust and transparency.
Looking for a partner who shares your values and supports sustainable growth? Contact us today to start a long-term collaboration.
Follow these steps to launch your outsourcing journey smoothly and effectively, ensuring alignment, performance, and growth.
Prioritize activities where your team lacks expertise or resources. Focus on tasks that have the biggest impact on growth, such as lead generation, sales outreach, or market research. This helps maximize ROI and ensures outsourcing delivers real value.
Define clear metrics such as the number of leads, qualified meetings, or conversion rates. Establishing expectations upfront allows you to measure progress and adjust strategies efficiently.
Work closely with your outsourcing partner to align workflows, tools, and communication. A thorough onboarding ensures the team understands your goals and can hit the ground running.
Ready to start working with the right partner and build a long-term, trusted collaboration that supports sustainable growth? Contact us today to begin your outsourcing journey and accelerate your growth.
Track KPIs regularly and review outcomes against expectations. Continuous monitoring helps identify bottlenecks, optimize strategies, and ensure your outsourced team remains aligned with business objectives.
Business development outsourcing is no longer just a cost-saving tactic.t’s a strategic move that empowers companies to grow faster, scale smarter, and access expert-level capabilities without overextending internal resources. Especially for startups and SMEs, outsourcing enables rapid market entry, improved lead generation, and greater operational focus.
While challenges such as communication gaps and quality control exist, they can be effectively managed through clear goal-setting, regular performance monitoring, and choosing the right outsourcing partner.
Ultimately, if your business is aiming for sustainable growth and wants to stay agile in a competitive landscape, business development outsourcing may be the key to unlocking your next stage of success.
Ready to get started?
Contact IVC for a free consultation and discover how we can help your business grow online.
Contact IVC for a Free Consultation
Why Outsource App Development? Key Benefits, Hidden Costs, and How to Get It Right
Top Software Outsourcing Companies in 2026: Find the Best Partner for Your Business
2025 Deloitte’s Global Business Services (GBS) Survey
All images featured in this article are provided by Unsplash, a platform for freely usable images.
The diagrams used in this article were created using Canva.