Custom API development connects your systems, automates workflows, and unlocks data that isolated applications cannot provide. Whether you need a REST API for your mobile app, a GraphQL endpoint for your frontend, or integrations between your existing tools, I build APIs that are documented, tested, and ready for production.
Off-the-shelf solutions rarely fit your exact business logic. Custom APIs give you full control over data flow, security, and integration points. Every API I build includes authentication, rate limiting, error handling, comprehensive documentation, and load testing results.
API Development Services
REST API development
Resource-oriented APIs built with Express.js or Fastify. Proper HTTP methods, consistent response formats, comprehensive error handling with appropriate status codes, and versioning from day one. Every endpoint is documented with OpenAPI/Swagger and tested with real traffic patterns.
GraphQL API development
Flexible GraphQL APIs for applications with complex data requirements. Schema-first approach with resolvers optimized for performance. DataLoader integration for efficient query batching. Subscription support for real-time data.
Third-party integrations
Custom integrations connecting your systems with payment gateways, CRMs, email platforms, analytics tools, and any service with an API. Secure credential management, webhook handling, data transformation, and error logging.
API migration and refactoring
Migrate legacy APIs to modern Node.js. Refactor poorly designed endpoints that are slow, inconsistent, or insecure. Add authentication, documentation, and testing to existing APIs that were built without them.
Frequently Asked Questions
How long does API development take?
A typical REST API with 10-20 endpoints, authentication, and database integration takes 2-4 weeks. Complex APIs with multiple third-party integrations, real-time features, or GraphQL implementations may take 4-8 weeks. Timeline depends on endpoint complexity and integration requirements.
Do you guarantee performance?
Yes. Every API is load-tested before handoff with traffic patterns that match your expected usage. You receive test results showing response times, throughput, and error rates under load. Performance benchmarks are included in the delivery documentation.
Related: REST API services – Node.js development – Backend for SaaS
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