Prague, Czechia 11°C mostly clear

Marek Stefanec

I love running and cycling — occasionally with a camera in hand. Currently at a financial institution in Prague, still studying computer science at Charles University.

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About

Who I am

Hi — I'm Marek. I work at a financial institution in Prague and study computer science at the Faculty of Mathematics and Physics, Charles University. I care about building software people actually enjoy using — but you're more likely to catch me on a run, out on a cycling trail, occasionally behind a camera, or deep in a good book.

Running Cycling Photography C# / .NET Thoughtful UX Books
Marek Stefanec with Václav Moravec at the Faculty of Mathematics and Physics
With Václav Moravec, Czech Television — after his talk on AI & journalism at MFF UK, early 2025.

Work

Financial institution Current

Working in the financial sector in Prague.

Latest from the blog

Windsurfing, south of Croatia

14 September 2026

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Now reading

The Great Gatsby

F. Scott Fitzgerald

Full library ↓

Library

English 17

  1. The Great GatsbyNow F. Scott Fitzgerald
  2. Empire of Pain Patrick Radden Keefe
  3. Swimming with Sharks Joris Luyendijk
  4. Lonesome Dove Larry McMurtry
  5. Animal Farm George Orwell
  6. The Subtle Art of Not Giving a F*ck Mark Manson
  7. Life 3.0 Max Tegmark
  8. 1984 George Orwell
  9. The Little Prince Antoine de Saint-Exupéry
  10. Factfulness Hans Rosling, Ola & Anna Rosling
  11. #GIRLBOSS Sophia Amoruso
  12. The Monk Who Sold His Ferrari Robin Sharma
  13. User Friendly Cliff Kuang & Robert Fabricant
  14. Let It Snow John Green, Maureen Johnson, Lauren Myracle
  15. Cold Comfort Farm Stella Gibbons
  16. Worth Dying For Tim Marshall
  17. Pride and Prejudice Jane Austen

Slovak & Czech 5

  1. Hlava 20 Andrej Krupa a Juraj Gago
  2. Hlava 21 Andrej Krupa a Juraj Gago
  3. Ako funguje Google Eric Schmidt & Jonathan Rosenberg
  4. Apple zvnútra Adam Lashinsky
  5. 7 návykov úspešných ľudí Stephen R. Covey

Recommend a book

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Programs & certifications

Published projects

  1. NaKoleji.czIn beta

    A verified social network for university dorms — meet the people on your floor, find someone to train with, and make dorm life a lot less anonymous. In beta now, with a rollout to major universities across the Czech Republic coming next.

    React Web app Social
    Open beta

  2. Stratene.skIn testing

    Currently in testing, with a nationwide rollout to organisations across Slovakia — and beyond — coming next.

    Web app SPA
    Open test build

  3. Prague Parking

    Finds the cheapest — or genuinely free — parking spots across Prague, so you stop circling the block and overpaying at the nearest garage.

    Web app Maps
    Open app

  4. Kindle Vocab → Anki

    Turns a Kindle's vocab.db into clean, per-book Anki decks — with optional dictionary notes and LLM-assisted explanations.

    Python SQLite LLM
    GitHub

  6. One-Pixel Attack on CIFAR-10

    Re-implementation of the one-pixel adversarial attack proposed by Su, Vargas & Sakurai (2019), targeting a small CNN trained on CIFAR-10.

    Python Adversarial ML
    GitHub

  7. FileSync for Windows

    A background file-syncing utility for Windows, written in C# — quiet, reliable, and packed with advanced sync capabilities.

    C# .NET Windows
    GitHub

05 — Contact

Let's talk.

Whether it's a project, an idea worth building, or just a book recommendation — my inbox is open.

marek@stefanec.one
GitHub Instagram Blog CV — being updated, back within 2 weeks