Custom REST, GraphQL and gRPC APIs engineered for reliability, security and scale. We connect your platforms, automate data flows and eliminate the silos slowing your product down.
From greenfield API design to complex enterprise integrations — we architect, build, document and maintain your API layer.
Every API we build follows enterprise-grade engineering standards — documented, versioned, secured, and monitored from the moment it ships.
We don't just write endpoints — we architect integration layers that become the backbone of your product.
A proven 5-step API delivery process that ships fast without cutting corners.
From mobile backends to enterprise middleware — APIs we build are the backbone of real products.
REST is ideal for simple CRUD operations, public APIs, and teams that value convention. GraphQL shines when clients need flexible data fetching, you have multiple front-end consumers with different data needs, or you want to reduce over-fetching. We'll recommend the right approach after understanding your use case — sometimes the answer is both.
A focused API module typically takes 1–2 weeks. A complete product API layer with auth, versioning, documentation, and monitoring takes 4–6 weeks. Integrations with third-party services typically add 1–3 days per integration depending on API quality. We provide a detailed estimate after reviewing your requirements.
Yes — every API we build includes auto-generated OpenAPI 3.0 / Swagger documentation with live examples, a developer sandbox for testing, and written integration guides. We also offer optional developer portal setup on Readme.io or similar platforms.
We implement OAuth 2.0 / JWT authentication, rate limiting, IP allowlisting, input validation and sanitisation, HTTPS enforcement, and run automated scans against the OWASP API Security Top 10 on every release. Security is not an afterthought — it is part of the architecture from day one.
Yes. We specialise in building adapter layers and middleware that expose legacy systems (SOAP, FTP, database-direct) as modern REST or GraphQL APIs without requiring you to replace the underlying system. This is one of the most common engagement types we handle.
API development at Appther starts from $5,000 for a focused integration and ranges to $50,000+ for a complete API platform with gateway, docs, SDKs and monitoring. We quote fixed-price after reviewing your scope — no hourly billing surprises.
Get a free API architecture review. We'll map your integration landscape and propose a clean, scalable solution — no commitment required.