Problem before stack
I start with the problem, not the stack. A good solution is one that fits the actual constraints — team size, operational maturity, timeline, budget — not the one that uses the most interesting technology.
Senior Python Developer
Daniel Milewski
I'm a software engineer 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.
Background
Python is still one of my main tools. I also work with AI/ML and frontend when the project calls for it, but backend systems and APIs are where I spend most of my time.
I'm comfortable owning a project end-to-end: from architecture decisions through implementation to deployment. I care about code quality, clear architecture, and making technical decisions that the next engineer can understand.
I work best with companies that have a clear problem, respect engineering, and want someone who communicates well with both technical and non-technical stakeholders.
Experience
2025 — Present
Energy Aspects
Python Developer
Energy market intelligence & research analytics
Research analytics — pipelines and internal tools turning market and commodity data into products for institutional subscribers.
2024 — Present
JIT Team
Senior Python Developer
IT services & software development · Warsaw / remote
Client projects in a software-house model — backend APIs, integrations, data processing, and shipping maintainable services for teams in Poland and abroad.
2024 — 2025
Equiti
Python Developer
Online brokerage & fintech (forex, CFD, multi-asset)
Backend and platform work for a regulated online broker — trading workflows, integrations, and internal tooling in a high-availability environment.
Tools & technologies
- Core languages
- PythonTypeScript
- Backend
- FastAPISQLAlchemyAlembicPydanticCeleryARQ
- Data
- PostgreSQLRedisSQLitePandas
- Infrastructure
- DockerGitHub ActionsVercelLinux
- Frontend
- Next.jsReactTailwind CSS
- AI / ML
- LangChainOpenAI APIAnthropic APIinstructorPineconeChroma
- Testing
- pytest
How I work
Bad news early
I communicate clearly and early. If something is going to take longer than expected, you hear about it before it becomes a problem. If the requirements have a hidden complexity, I flag it in the planning phase.
Code for the next person
I write code that other engineers can read. Good naming, clear structure, tests on the important paths. The kind of code that doesn't need a 30-minute explanation before you can contribute to it.
Business
I operate as a registered sole proprietorship (CEIDG) in Poland for freelance and B2B contracts — programming and related IT services (PKD 62.10.B and associated codes). Registered address: ul. Obrońców Westerplatte 144A, 80-317 Gdańsk. NIP: 8442338935 · REGON: 522772081
Public company record (Monitor Firm / PB.pl)