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Offer summary
(Summary generated by AI based on the full job description)
The project focuses on developing a backend for AI features, including APIs, data pipelines, and orchestration connecting language models for large-scale data retrieval and processing. Advanced skills in Python, FastAPI, PostgreSQL, Redis are required. Main responsibilities include API architecture, managing asynchronous workflows, and securely handling confidential data. The role demands ownership of system stability and integrations with external services, ensuring high performance and security.
from: 20 July 2026
to: 19 August 2026
30 420 - 47 531,25 złnet (+ VAT)/ mth.B2B contract
Offer parameters
level:senior
working mode:remote
location:Warszawa, Masovian
Warszawa, Masovian
Requirements
Expected technologies
Python
FastAPI
PostgreSQL
SQL
Redis
Celery
ARQ
LangGraph
RabbitMQ
Our requirements
- Seven years or more delivering production backends — though how deep you go matters more to us than the figure itself
- You think in failure modes, not just the happy path
- You've shipped genuine LLM systems (RAG, tool-calling, agents), or you can't wait to — and you've got a feel for where they fall apart
- You lean on AI coding tools (Claude Code, Cursor, Copilot) and get real value from them: more speed, yes, but you grasp and back every line — code you'd reject in someone else's review is code you won't merge in your own
- A startup that keeps changing course doesn't faze you — plans get set, then torn up and redrawn
Optional
- RAG or vector search experience
- LangChain or LlamaIndex
Your responsibilities
- Architect and ship the APIs and services that everything else depends on
- Own the AI plumbing end to end: retrieval, orchestration, tool-calling, streaming, and the evals that tell you whether the results are worth anything
- Make async and distributed workloads rock-solid — document ingestion, embeddings, and long jobs running on Redis
- Wire up integrations with what clients already use (email, document stores) and harden them for real-world traffic
- Put data security and isolation front and center, because clients are handing over material they can't afford to leak
About the project
You'll lead the backend that drives the AI features — the APIs, the data pipelines, and the orchestration that connects the product to the language models doing the actual work. In practice that's querying across large document sets, getting trustworthy answers out of LLMs and their tool calls, pushing results to the UI as they stream, and grinding through lengthy background jobs without the whole thing toppling over.
Forget CRUD. The real difficulty is making AI systems fast and reliable on confidential data, at production scale. The architecture choices land on you early, and you'll be the one living with them.
Tech stack experience
This is how we organize our work
This is how we work
in houseyou have influence on the choice of tools and technologiesyou have influence on the technological solutions appliedyou have influence on the product
Comm1t
comm1t is a specialist IT recruitment agency delivering top engineers across Poland and Europe 🇪🇺. We combine experienced recruiters with autonomous AI agents and an obsessive focus on quality — sourcing 24/7 across LinkedIn, GitHub, and beyond to reach engineers who aren't actively job hunting but are open to the right move.
We don't flood you with CVs. We get to know each candidate's skills, values, and goals, then send only the best-matched people — and we stay close through onboarding and the first months to make sure the placement lasts.
Senior Backend Engineer (FastAPI)
30.4k–47.5k zł / mth. (B2B)
I apply to:
Comm1t
Warszawa, Masovian
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