REST API development and improvement — predictable contracts, no guesswork
I design and improve REST APIs from the consumer's side — the frontend. Predictable contracts, OpenAPI documentation, integration without chasing explanations in Slack.
Is your API a
bottleneck or not?
Подходит
- Frontend and backend are developed separately — you need a single contract
- You need a BFF layer so the frontend doesn't pull in extra data
- The API exists but is unstable — the schemas need to be put in order
- You want OpenAPI documentation for the integrators' team
Не подходит
- The backend runs on a heavy, specific non-REST stack (GraphQL-only, gRPC)
- You only need frontend work — the API is already well designed
Every integration feels like a quest.
I look at APIs through the frontend's eyes — I know what makes integration smooth, and what turns it into daily pain.
The API is unstable: you have to guess the structure, and contracts change without warning.
You need an API built from scratch — convenient for the frontend, not dictated by the backend.
You need improvements: new endpoints, versioning, order in the contracts.
The frontend makes 12 requests instead of one — you need a BFF layer.
From contract
to integration.
I design and build the API so the frontend stops depending on its quirks.
Contracts
Predictable request/response schemas, versioning, consistent error rules.
Documentation
Clear and up to date — the frontend integrates without guesswork or back-and-forth messages.
Improvements
New endpoints, optimizing existing ones, fixing unstable spots.
BFF layer
Backend-for-Frontend: aggregating data for the interface's needs, fewer requests.
An API you can
actually trust.
Stable contracts and documentation that remove the friction between frontend and backend.
- 01Predictable contracts
The frontend knows what to expect in the response and stops hedging against surprises.
- 02Up-to-date documentation
Integration by the docs, not by chat messages.
- 03Stable integrations
Versioning and clear errors — updates don't break clients.
- 04Fewer requests
The BFF layer aggregates data for the interface — faster and simpler on the frontend.
No black boxes —
just contracts.
We talk
I look into the task and context for free. If it's not something I do, I'll say so honestly.
~ 1 hrI estimate
Timeline, scope, risks, and cost — before we start.
1–2 daysI work in iterations
Regular demos and clear progress at every step.
from 2 weeksI deliver with the code
I hand over the code and documentation. The project stays yours.
~ 1 hrI know what the
frontend needs —
because I am frontend.
- ✓The consumer's point of view. I design APIs the way they're comfortable to consume, not just to serve.
- ✓8 years of integrations. The complex booking domain means hundreds of integrations and edge cases.
- ✓Open source on this exact topic. rest-pipeline-js — my package that's exactly about reliable REST work.
- ✓Flexible on stack. The backend stack is negotiable, task by task — the result matters, not dogma.
FAQ
Recognize yourself?
Common requests people come with — and ones I know how to solve.
- The frontend is ready, another team is building the backend — you need a single contractOpenAPI + versioning
- The app makes 10+ requests for a single screen — it loads slowlyBFF aggregation
- The API changed — the client broke, nobody warned youVersioning + changelog
- You need documentation — the integrators' team doesn't know the contractsOpenAPI / Swagger
Macrulez REST API — contracts in a live project.
Built a custom REST API on Node.js for several of my own projects, plus an interactive API explorer instead of manual documentation: a reference of every endpoint with parameter types, request execution with Bearer authorization, and JSON response highlighting right in the browser.
Read the case study →What's wrong with your API right now?
Describe the pain — unstable contracts, poor documentation, awkward endpoints. I'll tell you how to fix it and what will take the least time.