aka Aleksander Marszałkiewicz
I’m a Python backend developer focused on building reliable, data-heavy systems and service-oriented architectures.
My work combines backend engineering, data pipelines, and DevOps practices, with hands-on experience in automation and applied ML systems (especially OCR and vision-language workflows).
I have 4+ years of professional experience working with Python, across ERP systems, data platforms, and custom backend services.
Before moving fully into software development, I worked in project management and ERP implementations, which left me with a high tolerance for legacy systems, unclear requirements, and things that “should work but don’t”.
- Backend services (FastAPI, Django)
- Data processing & pipelines (Polars, PostgreSQL, TimescaleDB)
- Distributed systems (Celery, Kafka, RabbitMQ)
- Observability & reliability (Grafana, Sentry)
- Automation & ML-assisted workflows (OCR, VLMs)
- Python (3.12+)
- FastAPI, Django
- Async processing & task queues (Celery)
- Polars, Pandas
- PostgreSQL, TimescaleDB
- Kafka, RabbitMQ
- ETL & data warehousing
- Docker, Docker Compose
- Kubernetes (basics)
- Local-first / on-prem environments
- OCR pipelines (Tesseract)
- Vision-Language workflows
- LangChain, LangSmith
- Practical integration of LLM/VLM APIs
- Building more robust and observable backend systems
- Moving towards high-performance services (Go / Rust)
- Improving system design under real production constraints
- 📧 Email: aleksander.marszalkiewicz@protonmail.com
- 🌐 Business card: https://cr-business-card-single.statichost.page/
- 📄 CV: available on the business site
I prefer concrete problems, clear ownership, and systems that survive contact with reality.