Petr Zahradník
Co-Founder at tapaya.
Prague, Czechia
Summary
🤩
Rockstar🎓
Top SchoolPetr Zahradník is a pragmatic technology leader and co-founder focused on building certified SoftPOS payment infrastructures that remove the need for dedicated POS hardware while preserving rigorous PCI security standards. With 11 years of experience across backend engineering and information security, he combines hands-on system design (Kubernetes, AWS, PostgreSQL) with leading certification efforts such as PCI MPoC and PCI DSS. As CTO and former CISO, he bridges product, partner onboarding, and technical integration for acquirers and PSPs across Europe, personally shepherding projects through certification and go-to-market. His background includes a full-stack rewrite and production-grade CI/CD and SBOM automation, plus practical incident response and pen-testing leadership. An advocate for localization and accessibility, he has contributed Czech translations to the widely used Marlin firmware, helping make embedded device UIs friendlier for Czech-speaking users. Based in Prague, he pairs an AI-oriented engineering education with deep payments security expertise to help clients capture new transaction volumes in the emerging SoftPOS market.
11 years of coding experience
5 years of employment as a software developer
Všeobecné osmileté gymnázium, Všeobecné osmileté gymnázium at Gymnázium a Střední odborná škola dr. Václava Šmejkala, Ústí nad LabemInženýr (Ing.), Artificial Intelligence, Inženýr (Ing.), Artificial Intelligence at Faculty of Electrical Engineering, Czech Technical University in Prague
Czech, English, German
Github Skills (4)
firmware10
localization10
3d-printing10
compiler8
Programming languages (15)
Github contributions (5)
MarlinFirmware/Marlin
Jun 2016 - Dec 2019
Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.
Role in this project:
Localization / Internationalization Specialist
Localization / Internationalization SpecialistContributions:16 commits, 16 PRs, 102 comments in 3 years 7 months
Contributions summary:Petr primarily contributed to the Czech language localization efforts within the Marlin firmware project. Their work focused on translating and updating various user interface strings displayed on the 3D printer's LCD screen, ensuring accurate and contextually appropriate translations for menus, settings, and informational messages. These updates included adding new translations for features like BLTouch, UBL, and advanced pause functionality, demonstrating an active role in keeping the Czech translation up to date with the evolving firmware features. This work is crucial for expanding the firmware's usability for Czech-speaking users.
vendorreprapmarlinesp32commercial
petrzjunior/petrzjunior.github.io
Jan 2016 - May 2019
Contributions:6 PRs, 71 pushes, 5 branches in 3 years 3 months
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