What services does A Major offer?

A Major offers web design, web app development, mobile app development (React Native, Swift, Flutter), SaaS product development, enterprise systems, UI/UX design, DevOps, performance optimization, MCP server development, AI agent infrastructure, MVP scoping, digital transformation, and engineering consultancy.

Where is A Major based?

A Major is based in Singapore and works with clients worldwide.

Do you work with international clients?

Yes. While headquartered in Singapore, A Major works with founders and businesses across Southeast Asia, Europe, and North America.

Ryu is an AI agent orchestration layer built by A Major. It enables teams to run, coordinate, and monitor AI agents at scale — connecting LLMs, tools, and workflows into reliable production systems.

Do you build MCP servers?

Yes. A Major builds Model Context Protocol (MCP) servers that connect AI agents to databases, APIs, and internal tools, enabling reliable LLM-powered workflows in production environments.

REST vs GraphQL — which should I choose?

REST for public APIs, simple CRUD, and broad interoperability. GraphQL for complex UIs with varied data needs and internal APIs. REST is simpler to cache and easier for external consumers.

How much does REST API development cost?

Costs depend on complexity — a simple CRUD API costs $5K–$15K. A production API with auth, versioning, rate limiting, webhooks, and SDK generation ranges from $20K–$80K.

What makes a REST API 'RESTful'?

Proper HTTP method semantics (GET reads, POST creates, PUT replaces, PATCH updates, DELETE removes), resource-oriented URLs, stateless requests, and hypermedia links for discoverability.

Should I use REST or tRPC for my project?

Use tRPC for internal TypeScript-to-TypeScript communication. Use REST when you need language-agnostic access, OpenAPI documentation, or third-party integrations.

REST API BackendStandards-first HTTP APIs built to last

REST is still the most interoperable API style — consumed by any language, debuggable in any tool, and understood by every developer. We design and build REST APIs that are consistent, versioned, and documented.

REST (Representational State Transfer) is the most widely adopted API architectural style — understood by every developer, consumed by any programming language, and debuggable with any HTTP tool. At A Major, we design and build REST APIs that follow industry best practices: consistent resource naming, proper HTTP semantics, versioning strategies, and comprehensive OpenAPI documentation. A well-designed REST API is a product in itself. We focus on developer experience for API consumers — clear error messages, pagination, filtering, rate limiting, and webhook delivery — ensuring your API is easy to integrate with and reliable at scale.

Quick start

bash

npx create-fastify-app my-api
cd my-api
npm install @fastify/swagger @fastify/swagger-ui
npm run dev

Read the full documentation at spec.openapis.org/oas/v3.1.0

OpenAPI / Swagger docs

Machine-readable API specs that generate interactive docs, client SDKs, and mock servers.

Auth & security

JWT bearer tokens, OAuth 2.0, and API key strategies — with rate limiting and CORS configured correctly.

Versioning strategy

URI versioning (/v1/, /v2/) or header versioning — backward-compatible evolution without breaking consumers.

Webhook delivery

Event-driven integrations via signed webhooks — retry logic, delivery logs, and failure alerting.

Caching headers

ETags, Cache-Control, and conditional requests — reduce redundant data transfer and server load.

SDK generation

OpenAPI Generator or Speakeasy to ship typed client libraries in TypeScript, Python, and Go.

Why it's hard

Over-fetching and under-fetching

REST endpoints return fixed response shapes. Clients often receive more data than needed or must make multiple requests — consider sparse fieldsets or GraphQL for complex UIs.

Versioning strategy decisions

URL versioning, header versioning, or content negotiation — each approach has trade-offs. Choosing wrong creates migration pain for existing consumers.

Consistent error formatting

Without a standard error format, API consumers face inconsistent error handling. Adopt RFC 7807 Problem Details for structured, machine-readable errors.

Rate limiting and abuse prevention

Public APIs need rate limiting, API key management, and abuse detection. These cross-cutting concerns must be designed from the start, not bolted on later.

Best practices

Use OpenAPI 3.1 as your source of truth

Define your API contract in OpenAPI first. Generate server stubs, client SDKs, and documentation from the same spec.

Return RFC 7807 Problem Details for errors

Structured error responses with type, title, status, and detail fields — machine-readable and consistent.

Implement cursor-based pagination

Offset pagination breaks with real-time data. Cursor-based pagination (using opaque tokens) is stable and performant.

Version from day one

Even internal APIs benefit from versioning. Start with /v1/ in the URL path — it's the simplest approach for most teams.

Useful resources

OpenAPI Specification REST API Design Best Practices Swagger Editor Postman API Platform

Frequently asked questions

Node.js

JavaScript all the way down

FastAPI

High-performance async Python APIs

Laravel

Elegant PHP backends shipped fast

Looking for end-to-end delivery? These services complement REST API projects.

Want to build with REST API?

Talk to our engineering team about your REST API architecture. We'll respond within 24 hours.

1 spot available in May 2026Apr 2026 fully booked

We limit intake each month so every project gets the focus it deserves.

REST API BackendStandards-first HTTP APIs built to last