Custom API Development and Microservices Integration Services.

Yes. Adding an API layer to an existing system is one of the most common things we do. The approach depends on your tech stack. For WordPress or WooCommerce, we build custom REST API endpoints as a plugin that sits alongside the existing system without touching core. For custom applications, we introduce a controller or route layer that calls your existing business logic rather than rewriting it. The existing system continues operating unchanged while the new API layer is built, tested, and validated on staging before it touches production.

API versioning (typically via URL path like /api/v1/ or Accept-Version headers) lets you introduce breaking changes to your API without forcing all existing consumers to update immediately. If your API will be consumed by external parties, mobile apps you do not fully control, or other teams with their own release cycles, versioning from day one is essential. If your API is strictly internal with a single frontend you own, you have more flexibility. We include versioning by default in our API designs and discuss the tradeoffs during scoping so the decision is made consciously rather than discovered as a problem after launch.

JWT (JSON Web Tokens) works well across both contexts. The user authenticates once, receives a short-lived access token and a longer-lived refresh token, and sends the access token with each request in the Authorization header. Web clients typically store the refresh token in an HttpOnly cookie for CSRF protection. Mobile clients store it securely in the device keychain or secure storage. Token expiry, refresh flows, and revocation on logout are all implemented. For third-party consumer access (like a partner integration), we use API keys with scoped permissions rather than user-level JWTs, which is more appropriate for server-to-server communication.

A regular API is an interface that exposes functionality from a system to consumers. A microservice is a small, independently deployable application that owns a specific domain within a larger system and typically exposes that domain via an API. The difference is in ownership and deployment, not just the interface. A microservices architecture means each service has its own codebase, its own database (ideally), and can be deployed independently. This gives you deployment flexibility and team autonomy, but adds operational complexity. Most early-stage products should start with a well-structured monolith and extract services only when a specific scaling or team ownership problem makes the complexity worthwhile.

We use three levels of testing. Unit tests cover individual functions and business logic in isolation. Integration tests call the API endpoints against a real database and verify the full request-to-response cycle including auth, validation, and persistence. Contract tests verify that the API response shapes match the OpenAPI specification so the spec and the implementation cannot drift apart. We also test error states explicitly: missing auth, invalid inputs, rate limit exceeded, and third-party service timeouts. All tests run in CI before any deployment. For public or partner-facing APIs, we additionally run load tests to confirm performance under expected peak request volumes.

Yes. Documentation is included in every API engagement, not treated as an optional extra. At minimum, we produce an OpenAPI 3.0 specification that serves as the machine-readable contract and powers interactive documentation tools like Swagger UI or Redoc. For public APIs where developer experience matters, we produce a hosted documentation portal with getting-started guides, authentication walkthrough, code examples in multiple languages, and an API changelog. If you need a full developer portal with API key management and usage analytics, we scope and build that as well. APIs that are not well-documented do not get adopted, regardless of how well they are engineered.