Backend and API integrations
We build a backend for a specific job or extend one that already works: an API on Node.js/TypeScript or Python, PostgreSQL, and the glue between payment systems, CRM, Google Sheets, Telegram and webhooks — the part that holds the data and automates the routine between services.
What is included
- an API on Node.js/TypeScript or Python, PostgreSQL or the database you already have;
- integration with payment systems, CRM, Google Sheets and Telegram;
- webhook receiving and sending with retries on failure and logs of what exactly broke;
- working with a backend written by someone else: new fields, new flows, fixes for what broke;
- API docs and a run guide.
How the work goes
What exists and what to wire up
We start from what already works: which backend, which database, which services. We say plainly what is cheaper to rework and what to build alongside — including, honestly, when fixing the other person's code turns out pricier than a fresh one.
Data model and contracts
Before any code we fix the entities, the fields and how the services talk to each other. The API contract can be tested before the backend is done, so the front end and the bots do not sit waiting.
Build and check on live data
Payments and webhooks are checked in sandboxes and on small real operations, not on mock-ups only: status mismatches and duplicate calls show up exactly there.
Handover and watching
You get the code, the API docs and the guide. If the backend runs on our server, we set up logs and an error alert instead of a silent failure.
Common questions
Will you extend a backend that someone else wrote?
Yes. We read the code first and name its state: what to rework, what to leave, what it costs. If it turns out honestly cheaper to rewrite a piece, we offer that option too.
Which languages and database do you use?
Node.js/TypeScript and Python, PostgreSQL as the database. If the project already lives on another stack, we work in it: afterwards the code has to be readable by you or your developer.
What does a CRM integration include?
Sync of the entities you need — orders, clients, statuses. One way or both, whichever suits you; the exact fields and events are pinned down at the first stage.
How much does extending an existing backend cost?
From $550 for a meaningful chunk: new fields, a flow or an integration. First an estimate from the code, then a fixed price — not a let us see and tell you in the middle of the job.
Who answers when an integration breaks?
Webhooks and payments run with retries and logging, so a failure is visible, not guessed. Afterwards you keep the support yourself or hand it to us, whichever is easier.
Where will the backend run?
Wherever you prefer: your server, ours or the cloud. Servers, Docker and backups are a separate service, Servers and DevOps; the deployment is done as part of the job.
Related cases
Contacts
Write to us — we will discuss the task and propose a plan within a day.
dmitry.zhdanov
Telegram: @signmark
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