---
title: "FastAPI Development Services: Kensink Labs"
description: "Typed Python APIs with FastAPI: automatic OpenAPI, async performance, eval-tested AI integration, full source ownership."
source: "https://www.kensink.com/languages/fastapi/"
canonical: "https://www.kensink.com/languages/fastapi/"
---
★ FastAPI Languages & Frameworks 8-week engagement

FASTAPI · PYTHON APIS

# Typed Python APIs with FastAPI. OpenAPI, async, AI-ready.

Typed request and response models, automatic OpenAPI docs, and async performance. FastAPI is our default for Python services, especially AI ones.

FastAPI Python PostgreSQL LLM API

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

Cycle

8 weeks · fixed price

Stack

FastAPI + Python

Output

Production code + eval suite

Handoff

Full source ownership

\[THE SHORT VERSION\]

## The typed, modern way to write Python services.

FastAPI gives Python the type safety and auto-generated docs that older frameworks lack, with async throughput for I/O-heavy and AI workloads. It pairs naturally with model integration work.

When it fits

-   A typed Python API, especially one serving AI or data
-   Services that need OpenAPI docs for consumers
-   Async, I/O-bound workloads

\[HOW WE BUILD IT\]

## How we build with FastAPI.

01

### Scope and fit

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

02

### Build on a tested foundation

We integrate FastAPI 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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[View .md](https://www.kensink.com/languages/fastapi.md)

\[RELATED\]

## Worth a look next.

[

Languages

Python

Read more

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

LLM Models

OpenAI GPT

Read more

](https://www.kensink.com/models/openai-gpt)[

Languages

React

Read more

](https://www.kensink.com/languages/react)

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)