// Build
Custom API Development
Well-designed APIs are the backbone of modern software. We design and build custom REST and GraphQL APIs that are typed, documented, versioned, and built to handle the integrations, load, and security requirements of your specific product.
// Key benefits
What makes this service valuable
OpenAPI-first design
We define API contracts in OpenAPI 3.0 before writing implementation code — enabling parallel frontend development, auto-generated client SDKs, and clear versioning contracts.
Type safety throughout
TypeScript on Node.js or Python with Pydantic — type safety from database model to API response, eliminating a class of runtime errors and simplifying maintenance.
Security baseline included
Authentication (JWT, OAuth 2.0), rate limiting, input validation, SQL injection prevention, and proper CORS configuration are baseline requirements, not optional additions.
// Details
APIs that work reliably and document themselves
A custom API is only as good as its documentation and reliability. We deliver APIs with OpenAPI 3.0 specifications, Swagger UI, automated test suites, and deployment configurations that enable confident integration by any consumer.
We choose REST or GraphQL based on your access patterns: REST for simple, resource-oriented APIs; GraphQL for complex data relationships, multiple clients with different data needs, or real-time subscriptions.
// What this includes
- OpenAPI 3.0 specification (contract-first)
- RESTful or GraphQL API design
- JWT and OAuth 2.0 authentication
- Rate limiting and quota management
- Comprehensive error handling and status codes
- Automated test suite (unit and integration)
- API documentation (Swagger UI / Redoc)
// Deliverables
What you receive
Every engagement produces clear, documented deliverables. Here is exactly what is included in our custom api development service.
- 01OpenAPI 3.0 specification
- 02Production API implementation
- 03Authentication and authorisation layer
- 04Automated test suite
- 05API documentation (Swagger UI)
- 06Deployment configuration and CI/CD
// FAQ
Common questions about custom api development
REST or GraphQL — which is better for my use case?+
REST is simpler, more cacheable, and well-understood. GraphQL is better when multiple clients need different data shapes, when data relationships are complex, or when real-time subscriptions are needed. We recommend based on your specific access patterns and team experience.
Do you design the API or just implement it?+
Both — API design is a core part of our engagement. We work with you to define resource models, endpoint structure, and data contracts before implementation. Good API design is far cheaper to get right at the design stage.
Ready to get started with custom api development?
Share your requirements with our team. We respond within one business day with a clear plan from discovery to delivery.