Senior / Staff Full Stack Engineer
New
Kraków, Armii Krajowej, Wrocław, -, Warszawa, -, Gdańsk, -, Bukareszt, -, Kraków, Country code: PLFull-TimeSenior
Salary27,000 - 30,000 PLN per month
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Job Details
- Languages
- En B2
- Experience
- 5+ years
- Required Skills
- PostgreSQLPythonGCPTypeScriptFastAPIFirebaseReact
Requirements
- 5+ years of professional full stack engineering experience.
- Strong experience with Python and backend API development.
- Strong experience with React and TypeScript in production applications.
- Experience with modern API frameworks, ideally FastAPI or similar.
- Understanding of AI / ML product workflows or strong interest in building software around AI outputs.
- Experience designing and consuming API contracts, schemas, and structured JSON payloads.
- Comfort with asynchronous workflows, background jobs, retries, partial failures, and user visible process status.
- Good testing habits, especially around edge cases, failure cases, and API behavior.
Responsibilities
- Building frontend experiences in React and TypeScript for evidence review, workflow status, recommendations, and decision outputs.
- Developing backend APIs in Python, ideally with FastAPI, for document upload, asynchronous processing, job status, retries, partial success, and structured results.
- Connecting frontend, backend, data workflows, retrieval systems, and AI generated outputs into a reliable product experience.
- Building product features that make AI outputs easier to inspect through source references, confidence signals, warnings, and clear error states.
- Working with structured data, documents, tables, financial metrics, and normalized evidence flows.
- Writing tests around API contracts, edge cases, error cases, and realistic user workflows.
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