API development
APIs that other software can trust.
REST or GraphQL, authentication done right, and response times kept low under load. Documented so the next engineer picks it up in an afternoon, and the code lands in your repo as it is written.
We build APIs that other software depends on: REST or GraphQL, with authentication done properly and response times kept low under load. That covers a backend for your own app, an integration layer between systems that were never meant to talk, or a public API for other developers to build on. Everything is documented so the next engineer, ours or yours, can pick it up. The code goes into your repo as it is written, not at final payment.
Not sure what a backend costs? Read the MVP cost guide or get an instant range from the estimator.
Documented REST or GraphQL endpoints, authentication done right, and latency kept low under load. Pick a request and watch the response come back.
{
"id": 42,
"email": "ada@example.com",
"name": "Ada Lovelace",
"role": "admin",
"created_at": "2026-01-14T09:20:11Z",
"verified": true
}RESTful APIs
Clean, well-documented REST APIs following industry best practices.
GraphQL
Flexible GraphQL APIs for efficient data fetching and real-time updates.
Secure Auth
OAuth 2.0, JWT, and API key authentication implementations.
High Performance
Optimized for speed with caching, rate limiting, and load balancing.
| With us | A typical backend contractor | |
|---|---|---|
| API documented as it ships | At the end, if ever | |
| Code in your repo from day one | ||
| Auth done properly (OAuth 2.0 / JWT) | Bolted on late | |
| Load-tested before launch | Sometimes | |
| Rate limiting and caching built in | ||
| Fixed scope, agreed up front | Hourly, open-ended |
- Week 1
Contract and endpoints
We agree the resources, the shapes, and the auth model, then publish an OpenAPI spec you can review before a single route is written.
- Weeks 2–3
Build against the spec
Endpoints land in reviewable slices with tests. You hit a live staging URL and the docs update themselves as each route ships.
- Weeks 3–4
Harden and load-test
We add rate limiting, caching, and auth guards, then run the API under load so latency stays low when traffic spikes.
- Launch
Handover you own
Deploy to your accounts, hand over the repo and the docs, and leave a backend your own team can extend.
- REST API Development
- GraphQL API Development
- API Design & Architecture
- Third-Party API Integration
- OAuth & Authentication
- API Documentation (OpenAPI/Swagger)
- Webhooks & Real-time APIs
- API Testing & Monitoring
- Node.js
- Express
- NestJS
- GraphQL
- Apollo
- PostgreSQL
- MongoDB
- Redis
- Swagger
- Postman
★★★★★
“codingeagle was awesome. The seller went above what I was paying for and was so patient. I would definitely recommend this service if you are looking for a professional to add payment integration to your site.”
Both, and we help you pick. REST suits most public and internal APIs and caches well; GraphQL earns its keep when clients need to fetch varied, nested data in one round trip. We scope the choice on the first call so it fits your clients, not our habit.
Properly, and from the start. We implement OAuth 2.0, JWT, or API keys depending on who is calling the API, with token rotation, scopes, and rate limits per key. Auth is designed in, never bolted on at the end.
Yes. Every endpoint ships with an OpenAPI or GraphQL schema and human-readable docs, generated as the code is written rather than hand-typed after the fact. The next engineer, ours or yours, can pick it up without a handover call.
That is a lot of what we do: an integration layer between systems that were never meant to talk, a backend for your own app, or a public API for other developers. We map the data, handle the edge cases, and keep the contract stable.
Yes. The code goes into a repository you own as it is written, deployed to your own accounts. There is no lock-in to our hosting, and nothing is held back until final payment.
Need an API your software can depend on?
Book a call and get a fixed scope, an OpenAPI spec, and endpoints you can hit in staging within the first weeks.