Senior Python Engineer building maintainable backend systems.
Focused on software architecture, distributed systems, APIs, observability and production reliability.
rozycki.dev · toastin.it · LinkedIn · kontakt@rozycki.dev
I build backend systems primarily in Python, with an emphasis on maintainability, clear boundaries and reliable operation in production. My work spans APIs, distributed systems, software architecture, observability, cloud infrastructure and the modernization of existing systems.
I also use tools such as OpenAI Codex and Claude Code to support design, implementation, testing and review. The goal is disciplined AI-assisted engineering: faster feedback and delivery while keeping architecture, correctness and ownership with the engineer.
- Backend: Python, FastAPI, Django, Django Ninja, SQLAlchemy, PostgreSQL, Redis, Celery
- Architecture and systems: REST APIs, distributed and event-driven systems, microservices, Clean Architecture, Domain-Driven Design concepts, system modernization
- Cloud and infrastructure: AWS, GCP, Docker, Terraform, GitHub Actions
- Observability: OpenTelemetry, Prometheus, Grafana, Loki, Sentry, Datadog
- AI-assisted engineering: OpenAI Codex, Claude Code, AI agents and agentic development workflows
I write about Python, software architecture, APIs and engineering practice at toastin.it.
- Python Łódź Meetup — “Jak logi mogą ocalić Twój dzień?”
- Python Katowice Meetup — “Simple is better than complex”
- PyData Bydgoszcz — “Simple is better than complex”
- Website — rozycki.dev
- Blog — toastin.it
- LinkedIn — linkedin.com/in/daniel-rozycki
- Email — kontakt@rozycki.dev