Limited availability — open to conversations

Senior Python Developer — backend systems, APIs, and software that ships.

I build backend systems and APIs in Python. I occasionally work on AI tools and frontend — when the project needs it.

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PythonBackend SystemsREST APIsFastAPIPostgreSQLAutomationAI / ML

Selected work

Projects I'm comfortable putting my name on.

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Solo Full-Stack Engineer & Product Owner

InvestTracker — Personal Wealth & Portfolio Analytics Platform

Problem: No existing tool could consolidate Polish investment accounts (IKE, IKZE, OIPE, Finax) together with foreign stocks, ETFs, crypto, and precious metals into a single accurate dashboard.

Solution: Built a full-stack portfolio tracker from scratch — FastAPI backend with FIFO cost basis calculations, three market data providers, multi-currency reconciliation, and a React dashboard that shows everything in one place.

Live production app at investtracker.eu. The only tool that correctly consolidates Finax transactions with Polish tax-advantaged accounts and international holdings into one accurate P&L view. Active development continues — potential SaaS release planned.

PythonFastAPIPostgreSQLSQLAlchemyAlembic+8

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What I work on

The areas where I can take ownership from first line to production.

Python Backend Engineering

Production-grade Python services built to last: FastAPI, SQLAlchemy, async patterns, clean architecture, tests, CI/CD. Opinionated about maintainability.

APIs & System Design

REST API design, async data pipelines, PostgreSQL, Redis, multi-tenant systems. Comfortable reasoning about scalability and making architectural tradeoffs explicit.

Automation & Integrations

Python workflows that replace manual, error-prone processes. Celery, scheduled jobs, API integrations, data pipelines. Built to run unattended with clear observability.

AI / ML

RAG pipelines, LLM agents, document intelligence, structured extraction. Practical tooling built as part of a larger system — not standalone demos.

Frontend Delivery

When the product requires it: Next.js, React, TypeScript, Tailwind. Not a designer, but builds interfaces that work well and don't embarrass the backend.

About

I'm a Python developer with a background in backend engineering, financial systems, and automation. I've worked in energy market intelligence, fintech, and IT services — mostly building the kind of software that handles real data and real edge cases.

My primary tool is Python. I occasionally work with AI/ML and React when the project calls for it, but backend systems and APIs are where I spend most of my time.

More about me

Writing

Notes from building real systems, not theory.

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PythonLLMsProduction

Practical Lessons from Building LLM Apps in Production

LLM demos are easy. Production LLM apps are not. Here's what I've learned shipping several of them — the problems nobody talks about in tutorials.

15 November 2024 · 3 min read

PythonFastAPIBackend

FastAPI Patterns I Actually Use in Real Projects

Not the patterns from the docs — the ones that have actually held up in production, across multiple projects with real teams maintaining them.

3 October 2024 · 3 min read

PythonAutomationProduct Thinking

What Makes Automation Projects Actually Valuable for Businesses

Most automation projects fail not because of technical problems, but because they solve the wrong thing. Here's how to identify what's actually worth automating.

10 September 2024 · 3 min read

Need a senior Python developer for backend, API, or automation work?

Limited availability for new work — happy to talk about future collaboration.

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About

My primary tool is Python. I occasionally work with AI/ML and React when the project calls for it, but backend systems and APIs are where I spend most of my time.

More about me