I build software with a focus on Python backend systems, cloud infrastructure, and practical security.
My work sits at the intersection of engineering, systems thinking, and real-world operational environments. I enjoy designing software that is reliable, maintainable, and capable of solving practical problems — whether that means building APIs, automating infrastructure, or developing small independent applications.
Before transitioning fully into engineering, I spent more than a decade working in international business development and financial risk intelligence, including roles at the Polish Embassy in Brazil and Refinitiv / World‑Check.
That experience shaped how I approach technology today: systems should not only be elegant technically, but also useful, secure, and aligned with real-world constraints.
Today I focus on building and experimenting with backend systems, APIs, cloud infrastructure, and independent developer tools.
- 🐍 Building robust Python backend systems
- 🔌 Designing API‑driven architectures
- ☁️ Expanding my work with Azure cloud infrastructure
- 🛡️ Applying security‑first engineering practices
- 🐧 Deepening my knowledge of Linux systems and automation
- 🧰 Working with Docker, Bash, and DevOps tooling
- 🧠 Exploring ideas for independent software products
Python • JavaScript • Bash • PowerShell • YAML • SQL
Azure • Linux • Docker • Bicep
HTML • CSS • Bootstrap
Git • VS Code • Markdown • JupyterLab
- Polish (native)
- English (fluent)
- Portuguese (fluent)
- Spanish (advanced)
- German (advanced)
- Russian (fluent)
- Dutch (basic)
I enjoy building small, focused systems that explore real engineering problems.
Many of my projects are intentionally designed as independent tools, backend services, or infrastructure experiments. The goal is to continuously improve my engineering capabilities while exploring ideas that could eventually evolve into useful software products.
Typical themes in my work include:
- Python backend services
- API design and integration
- developer tools and automation utilities
- containerized applications
- cloud-native experiments
- security‑aware system design
Rather than building one large monolithic project, I prefer developing multiple evolving systems, each exploring a specific concept:
- clean service architecture
- reliable API design
- maintainable Python backend structures
- infrastructure automation
- containerized deployments
- secure configuration and secret handling
Many of these projects are documented through technical write‑ups and development notes shared on dev.to and GitHub.
Below are some of the projects I have built and deployed publicly.
A privacy-focused secure file transfer service designed to allow users to send sensitive files safely.
The project explores secure file sharing, encryption-aware design, and privacy-first architecture, with a focus on simple usability and strong security fundamentals.
A lightweight weather analytics tool that monitors environmental conditions across selected cities.
The project focuses on API integration, backend data collection, and simple data visualization, while exploring how small cloud-hosted services can provide useful insights with minimal infrastructure.
🌐 LinkedIn
https://www.linkedin.com/in/marek-zarzycki-414ab62/
✍️ Blog
https://dev.to/marcoz
🌍 Website
https://nubecode.eu