Modern applications often require backend APIs to handle data, authentication, payments, and third-party integrations. We design and build REST and GraphQL APIs with clear OpenAPI contracts, semantic versioning, and comprehensive documentation. REST endpoints follow standard HTTP status codes (200 OK, 201 Created, 400 Bad Request, 401 Unauthorized, 404 Not Found, 500 Internal Server Error) and use idempotent verbs (GET, POST, PUT, DELETE) consistently.
Authentication is handled using industry-standard protocols including OAuth 2.0 for delegated access and JWT (JSON Web Tokens) for stateless session management. Rate limiting protects APIs from abuse, and CORS policies are configured correctly for cross-origin requests. Backend services are built in .NET (C#) or Node.js depending on project requirements, both using strongly typed languages and robust frameworks.
Data persistence uses relational databases (SQL Server, PostgreSQL, MySQL) with normalised schema design, appropriate indexing, and transactional integrity. Third-party integrations include payment gateways (Stripe, PayPal), booking systems (Booksy, Square), CRM platforms (HubSpot, Zoho), and email services (Mailchimp, SendGrid). Each integration is abstracted behind a clean interface so dependencies can be swapped without rewriting application logic.
REST and GraphQL solve the same problem differently. REST gives you one URL per resource and is simpler to cache, debug and document — it is the right default for most business websites and integrations. GraphQL gives the client a single endpoint and lets it ask for exactly the fields it needs, which earns its keep when one screen pulls from many sources or when mobile bandwidth is a real constraint, at the cost of more complex caching and a steeper learning curve. For a small business site with a contact form and a booking integration, REST is almost always the correct answer, and we will say so rather than sell you complexity you do not need.