An API is a product. It deserves the same design discipline as a user interface.
A well-designed API enables integrations, mobile clients, third-party partners, and automation that a well-designed web interface can't support. A poorly designed API becomes a liability that breaks integrations, confuses developers, and resists change. We design and build production APIs with the standards that make them maintainable and extensible.
You need to expose your data or functionality to third-party integrations, a mobile app, or a public developer ecosystem. You want the API designed correctly the first time.
APIs built quickly for a specific internal use case have a common set of design problems that create maintenance debt when the API is eventually used by external consumers. Inconsistent naming conventions (some endpoints use camelCase, some use snake_case). Error responses that don't include structured error codes (just status codes and human-readable messages). No versioning strategy (a breaking change to the API breaks all existing integrations with no migration path). Authentication that works for internal use but isn't suitable for third-party developers (API keys stored in plaintext, no scopes, no rate limiting).
The cost of a poorly designed API is front-loaded in integration time (developers waste hours figuring out undocumented behaviour) and back-loaded in maintenance cost (every breaking change requires coordinating with all integration partners). Well-designed APIs minimise both.
The standards that make APIs maintainable: consistent resource naming (nouns, not verbs, hierarchical where appropriate); comprehensive OpenAPI documentation with examples; structured error responses with machine-readable error codes; API versioning with a clear deprecation policy; authentication with appropriate scopes; and rate limiting with documented limits and clear rate limit response headers.
A production REST or GraphQL API with authentication, rate limiting, documentation, versioning strategy, and the error handling that makes it reliable for consuming applications.
API design before implementation
OpenAPI specification written before a single line of code. Every endpoint, every request schema, every response schema, every error type documented. The specification is reviewed and approved before implementation starts.
RESTful resource design
Resource-oriented URL structure, standard HTTP methods (GET, POST, PUT, PATCH, DELETE) with consistent semantics, appropriate HTTP status codes, and pagination for collection endpoints.
Authentication and authorisation
API key management system for external developer access. OAuth 2.0 for user-delegated access when required. JWT bearer tokens with appropriate expiry. Scope-based access control that limits what each API key can do.
Rate limiting
Per-key rate limiting with documented limits. Rate limit response headers (X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset) following standard conventions. Graceful 429 responses with retry-after guidance.
SDK generation
TypeScript and Python SDK generation from the OpenAPI specification (using openapi-generator or equivalent). SDKs reduce the integration burden for consuming developers. Built on Next.js API routes or Node.js with TypeScript, Postgres.
One honest number to start.
Fixed-scope, fixed-price. The number below is the starting point — final scope is built from your brief.
A production REST or GraphQL API with authentication, rate limiting, documentation, versioning strategy, and the error handling that makes it reliable for consuming applications.
Three steps, every time.
The same repeatable engagement on every project. No surprises, no mystery, no billable ambiguity.
Brief & discovery.
We send you questions, then get on a call. Output: a written scope with every step, feature, and integration listed.
Build & ship.
Fixed schedule, weekly reviews. No scope creep unless you change the scope — and if you do, we reprice it transparently.
Warranty & retainer.
30-day warranty on every launch. Most clients stay on a monthly retainer for ongoing features and maintenance.
Why Fixed-Price Matters Here
An API is a defined product. The endpoints, the authentication model, the rate limits, and the documentation are the specification. Fixed scope, fixed price.
Related engagements.
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Read moreQuestions, answered.
REST is the right choice when: the API exposes well-defined resources; consumers have predictable data needs; the API will be consumed by third-party developers who expect standard REST conventions. GraphQL is the right choice when: consumers have highly variable data needs that would require many different REST endpoints; the API is consumed primarily by first-party clients (web and mobile apps) that can benefit from precise data fetching; or a single API needs to serve very different consumer types efficiently.
The standard versioning strategy is URL path versioning (/v1/, /v2/) with a defined deprecation policy (at least 12 months notice before deprecating a version). Additive changes (new endpoints, new optional response fields) are made within the current version. Breaking changes (removing fields, changing response shapes, changing authentication) require a new version.
OpenAPI 3.0 specification is the foundation. We generate Redoc or Swagger UI documentation from the OpenAPI spec, plus a developer portal with quick start guides, authentication instructions, and example code in multiple languages.
A production REST API with 10–20 endpoints, authentication, rate limiting, and documentation typically runs $25k–$45k. Complex business logic, OAuth 2.0 implementation, and SDK generation add to the scope. Fixed-price.
8 to 12 weeks from API design specification to production deployment.
Tell Ryel about your project.
Describe what you’re building and what outcome you need. You’ll have a written, fixed-price scope within the week.