Services
API Development & Integration Services
Applications rarely operate in isolation — they need to talk to payment processors, mapping services, ERPs, messaging platforms, and each other. I design REST APIs from scratch and integrate third-party APIs into existing systems, with attention to the parts that are easy to skip: error handling, retries, and what happens when the third-party service is slow or down.
Good API work is mostly about handling the failure cases correctly, since the happy path is rarely where integrations actually break in production.
Problems This Solves
- arrow_rightNo API layer at all — the frontend talks directly to the database, which doesn't scale or secure well
- arrow_rightA third-party integration (payments, shipping, CRM) that needs to be added reliably, not just made to work once in testing
- arrow_rightWebhooks from external services that need to be handled idempotently and securely
- arrow_rightAn existing API with no documentation, making it hard for anyone else to build against it
What's Included
- checkREST API design with consistent resource naming and status codes
- checkAuthentication (API keys, OAuth, JWT) appropriate to the use case
- checkThird-party integration: payment gateways, maps, ERPs, messaging APIs
- checkWebhook handling with signature verification and idempotency
- checkError handling and retry logic for unreliable external services
- checkAPI documentation for internal or partner use
How I Work
- Define the resources and operations the API needs to support based on how the frontend or partner will actually use it
- Build authentication and authorization first, before any business logic
- Implement endpoints with input validation and consistent error responses
- For third-party integrations, build against their sandbox environment and handle documented failure modes explicitly
- Load test critical endpoints and add rate limiting where needed
Technology Stack
- arrow_rightNode.js
- arrow_rightTypeScript
- arrow_rightREST / GraphQL
- arrow_rightStripe, PayPal, HyperPay
- arrow_rightGoogle Maps API
- arrow_rightWhatsApp Business API
Suitable For
Products that need a proper API layer between frontend and database, businesses connecting their systems to payment processors or ERPs, and teams that need a specific third-party integration built and tested properly rather than patched together.
Frequently Asked Questions
REST or GraphQL for a new API?add
REST for most applications — it's simpler to build, cache, and debug. GraphQL earns its complexity when a frontend genuinely needs to query flexible, nested data shapes and over-fetching with REST becomes a real performance problem.
How do you handle a third-party API that's unreliable?add
Retry logic with backoff for transient failures, idempotency keys so retries don't create duplicate charges or records, and monitoring so failures are visible instead of silently swallowed.
Can you integrate payment gateways like Stripe or HyperPay?add
Yes — checkout flows, subscription billing, and webhook handling for payment events (successful charges, failures, refunds, disputes) across Stripe, PayPal, and HyperPay.
Do you document the API for other developers?add
Yes, typically as an OpenAPI spec or a written reference covering endpoints, auth, and expected request/response shapes — useful both for your own team and for any partner integrating against it.