01
Async concurrency
Event loops, non-blocking database access and WebSockets — and spotting the blocking call that quietly stalls every request.
Senior / Staff
Hire senior Python and FastAPI engineers
Python engineers who build asynchronous FastAPI services, AI inference endpoints and data workers — and who know when async helps and when a plain worker queue is the better tool.
Role profile
What we look for in a Senior Python & FastAPI Developer
Seniority and experience are agreed in the proposal, and you interview every engineer before they start. These are the skills that interview should test.
02
Validation with Pydantic v2
Request and response models that validate at the boundary and document the API through the generated OpenAPI schema.
03
Data layer and migrations
Async SQLAlchemy 2.0 models, connection pooling, and Alembic migrations written to run against a live database.
Typical work
What a Senior Python & FastAPI Developer typically works on
Examples of the scope this role is hired for. Your statement of work sets the actual deliverables and how they are accepted.
- 01Streaming LLM endpoints over server-sent events
- 02Moving synchronous Flask or Django endpoints to async FastAPI
- 03OpenAPI-generated client SDKs published from CI
- 04Pooled asyncpg access to PostgreSQL or Aurora
Stack and tools
What this role works with day to day. Tell us your stack and we’ll say plainly which parts we can staff.
- Python 3.12+
- FastAPI
- Pydantic v2
- SQLAlchemy 2.0
- asyncpg
- Redis
Technology guides
Related service
Custom software developmentA system built around your workflow, shipped in weekly increments — not a rewrite that lands a year late.
How hiring works
Four steps, agreed in writing before anyone starts
01
Tell us the role
The stack, the seniority you need, the hours you want covered, and any certifications the work requires. We reply within one business day.
02
We propose engineers
A written proposal sets out who we'd put forward, their seniority and experience, the scope, and the terms. If we can't staff the role well, we say so.
03
You interview every engineer
Nobody starts on your codebase until you've interviewed them and agreed. Use the skills on the role page as your interview checklist.
04
Working arrangements go in the SOW
Working-hours overlap is agreed for each engagement and written into the statement of work — the shared window, who shifts hours, and how handoffs work outside it.
QuantmHill provides development teams from India for Indian startups and SMEs. Role profiles describe project capabilities; availability is confirmed for your engagement. Our team works on India Standard Time. Project working hours, availability and handoff responsibilities are agreed before kickoff.
Need specific certifications? Tell us at the start and we'll confirm whether we can staff to that requirement before you sign. There are no recruiting fees.
FAQ
Questions about hiring a Senior Python & FastAPI Developer
Answered the way we would on a call. If yours isn’t here, send it — we reply within one business day.
FastAPI is async-first, validates requests from Pydantic type hints, and generates OpenAPI documentation from the same code. Django still wins when you want its admin, ORM and batteries included; we'll say which fits your system rather than defaulting to one.
Yes — streaming LLM endpoints, embedding pipelines and background workers with Celery or Arq are typical work for this role. Tell us your model provider and traffic shape, and the proposal will name engineers with that experience.
Related roles
Similar and adjacent roles
Add a Senior Python & FastAPI Developer to your team
Tell us the stack, the seniority you need and the hours you want covered. We reply within one business day, and you interview every engineer before they start.