---
title: "API & Backend Development: Kensink Labs"
description: "API and backend development from a senior lab: API-first design, typed, tested, observable. Full source ownership at handoff."
source: "https://www.kensink.com/services/api-backend-development/"
canonical: "https://www.kensink.com/services/api-backend-development/"
---
★ API & backend development Project Types 8-week engagement

PROJECT TYPE · APIS + BACKENDS

# Production APIs and backends. Typed, documented, observable.

The engine behind the product: data models, business logic, integrations, and a clean, documented API. We build backends that are typed, tested, and observable.

TypeScript Node.js PostgreSQL OpenAPI 3.x

[Start a conversation →](https://www.kensink.com/contact) [All project types →](https://www.kensink.com/services)

Cycle

8 weeks · fixed price

Stack

Node / Python

Output

Production code + eval suite

Handoff

Full source ownership

\[THE SHORT VERSION\]

## The part users never see and always feel.

A backend's job is correctness, performance, and a contract other systems can rely on. We design the API first, model the data deliberately, handle integrations and edge cases honestly, and ship with observability so problems surface before users report them.

When it fits

-   APIs for web, mobile, or partner clients
-   Backends for an existing frontend or app
-   Integrations and data-processing services

\[HOW WE BUILD IT\]

## How we build with API & backend development.

01

### Scope and fit

We decide where API & backend development earns its place in your system, and where a simpler tool wins. No resume-driven architecture.

02

### Build on a tested foundation

We integrate API & backend development against a foundation we trust: typed code, CI, and observability from the first commit. Boring infrastructure, modern surface.

03

### Eval before launch

An eval suite proves the build behaves before it reaches a user. We measure, then ship.

04

### Handoff with ownership

Your team gets the code, the tests, and a runbook. No lock-in to us or to a vendor framework.

\[ WHAT YOU GET \]

## What the engagement leaves behind.

Senior

Engineers who have shipped this before

100%

Source ownership at handoff

Eval-first

Tested before it ships

0

Framework lock-in

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\[RELATED\]

## Worth a look next.

[

Design Patterns

Headless & API-first

Read more

](https://www.kensink.com/patterns/headless-api-first)[

Languages

Node.js

Read more

](https://www.kensink.com/languages/nodejs)[

Project Types

Web application development

Read more

](https://www.kensink.com/services/web-application-development)

APPLIED K-FRAMEWORK

## Bring the problem.  
We’ll bring the build.

Senior engineers, eval suite at handoff, full source ownership. Sprint, program, or ongoing. We shape the engagement to the work.

[Start a conversation →](https://www.kensink.com/contact) [Read the K-Framework](https://www.kensink.com/k-framework)