Backend and API development
REST APIs with validated inputs, proper error handling and documentation — built to be integrated with, not just to work once. This service covers backend work on its own: an API that a frontend, mobile app or another service can rely on, independent of who builds what consumes it.
Problems this service solves
No documented API for a frontend or third party to integrate against
Inconsistent error handling or response formats across endpoints
Missing input validation, leaving endpoints exposed to bad or malicious data
A backend that has grown without a clear structure between routing, business logic and data access
Who this is for
A business that needs a backend built or improved independently of the frontend — for example, an existing frontend team that needs an API to consume, or a business consolidating backend logic that's become hard to maintain. Typically a smaller-scale engagement than a full application build, since there is no frontend in scope.
What’s included
An Express.js REST API with a clear routes/controllers/services/models layering
Zod validation on every request body, params and query
A consistent success/error response format across all endpoints
Helmet security headers, CORS restricted to an explicit origin allowlist, and rate limiting on sensitive routes
Structured logging with Pino
OpenAPI/Swagger documentation
Development approach
Follows the standard eight-step process, with requirement analysis focused on the data model and the endpoints a consuming frontend or service actually needs, since there is no interface to design around.
See the full processTechnologies used
- Node.js
- Express.js
- MongoDB Atlas
- Mongoose
- JWT
Expected deliverables
A deployed, documented REST API
Source code repository access
OpenAPI/Swagger documentation
Server-side validation and error handling across all endpoints
Estimated timeline
There’s no fixed timeline for this service — it depends on scope, how many integrations or third-party pieces are involved, and how quickly feedback comes back during review. You’ll get a project-specific timeline as part of your quote, not a generic estimate.
Get a project-specific estimateRelated projects
Portfolio examples for this service are on the way — see the full Featured Portfolio for current work.
Frequently asked questions
Ready to talk about your project?
Tell us what you’re building and we’ll scope backend and api development around what your project actually needs.
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