{"id":2122908,"url":"https://alion.io/job/comm1t-senior-backend-engineer-fastapi","title":"Senior Backend Engineer (FastAPI)","company":{"id":4372500,"name":"comm1t","domain":"comm1t.io","url":"https://alion.io/company/comm1t","size_band":null,"is_staffing_agency":true,"employer_type":"agency","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"contractor","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":["Warsaw, Poland"],"countries":["PL"],"hiring_countries":["PL"],"hiring_countries_total":1,"salary":{"min":8000,"max":12500,"currency":"USD","period":"month","gross":null,"usd_annual":150000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"Claude Code","optional":false},{"name":"Copilot","optional":false},{"name":"Cursor","optional":false},{"name":"Embeddings","optional":false},{"name":"FastAPI","optional":false},{"name":"GitHub","optional":false},{"name":"LLM","optional":false},{"name":"RAG","optional":false},{"name":"Tool Use","optional":false},{"name":"Python","optional":true}],"status":"live","first_seen_at":"2026-10-04T15:00:16Z","employer_posted_date":null,"last_verified_at":"2026-10-04T15:00:16Z","board_verified":false,"closed_at":null,"days_open":9,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":9},"description":"About us\ncomm1t 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.\nWe 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.\n\nAbout the role\nYou'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.\nForget 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.\n\nWhat you'll do\nArchitect and ship the APIs and services that everything else depends on\n\nOwn the AI plumbing end to end: retrieval, orchestration, tool-calling, streaming, and the evals that tell you whether the results are worth anything\n\nMake async and distributed workloads rock-solid — document ingestion, embeddings, and long jobs running on Redis\n\nWire up integrations with what clients already use (email, document stores) and harden them for real-world traffic\n\nPut data security and isolation front and center, because clients are handing over material they can't afford to leak\n\nWho you are\nSeven years or more delivering production backends — though how deep you go matters more to us than the figure itself\n\nYou think in failure modes, not just the happy path\n\nYou'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\n\nYou 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\n\nA startup that keeps changing course doesn't faze you — plans get set, then torn up and redrawn\n\nTech stack experience\nPython: 6+ years\n\nFastAPI: 3+ years\n\nPostgreSQL / SQL\n\nRedis: 2+ years\n\nNice to have\nRAG or vector search experience\n\nLangChain or LlamaIndex\n\nTech stack\nPython\nfastapi\nRedis\nCelery\nRabbitMQ\nPostgreSQL\nLangchain\nRAG","description_format":"text","description_chars":2661,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[{"name":"Poland","iso":"PL","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-08T23:50:21Z"}],"visa":[],"liveness":{"score":48,"band":"ok","label":"Likely open","p_open":1,"p_active":0.476,"p_room":1,"age_days":9,"expected_fill_days":29,"reasons":["seen:9","agency","velocity","win:early"],"computed_at":"2026-10-14T06:34:16Z"},"pay":{"stated_usd_annual":150000,"is_top_pay":false},"html_url":"https://alion.io/job/comm1t-senior-backend-engineer-fastapi","json_url":"https://alion.io/job/comm1t-senior-backend-engineer-fastapi.json","meta":{"generated_at":"2026-10-14T12:09:21Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":14755,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-15T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":4372500},"rest":"https://alion.io/mcp/rest/get_company?id=4372500"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcomm1t-senior-backend-engineer-fastapi"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fcomm1t-senior-backend-engineer-fastapi"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fcomm1t-senior-backend-engineer-fastapi"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/comm1t-senior-backend-engineer-fastapi\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcomm1t-senior-backend-engineer-fastapi"}]}