Sonnet Code
Framework · Framework

Work with senior FastAPI engineers.

FastAPI engineers who ship production systems, not pitch decks.

We build production FastAPI systems for US product teams every week. Senior engineers, aligned with your timezone, embedded in your process. We write FastAPI the way your team will still want to read it next year.

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FastAPI in production
Why Sonnet Code for FastAPI

The bar we hold ourselves to.

Senior only

Every engineer we put on your work has 5+ years shipping production code. No rotations out, no bait-and-switch.

Measured, not promised

Performance budgets, observability, and evaluation metrics are part of the build — not things we add after you ask.

Honest scoping

We'll tell you when this is the wrong tool for the job. The fastest way to lose a client is to ship the wrong thing.

What we build with FastAPI

FastAPI work, shipped.

New FastAPI systems

Greenfield FastAPI services architected for the three-year horizon — proper boundaries, tests, and documentation from day one.

FastAPI modernization

Incremental migration from legacy systems, using the strangler-fig pattern so you never bet the farm on a single cutover.

FastAPI scaling

Taking an existing FastAPI codebase from working-for-10k-users to working-for-10M-users, without a full rewrite.

FastAPI team augmentation

Senior FastAPI engineers embedded in your team, shipping alongside your engineers with the same standards and PR process.

Ready to get started with FastAPI? Fifteen minutes is all it takes.