About Me

Petr
Ziegner

Penetration Tester  ·  Programmer  ·  Radio Amateur  ·  Cyborg

Offensive security professional and lifelong hacker based in Prague. I test systems, break things responsibly, and build tools that matter. When I'm not at a terminal, I'm in the workshop, on the radio, or tinkering with the five chips under my skin.

2020 Active since
Prague Based in
Integra EMEA Current role
Petr Ziegner
 Professional Summary

I'm a penetration tester with hands-on experience across a wide range of target types: web applications, APIs, internal networks, cloud environments, OT/SCADA systems, ATMs, embedded devices, wireless protocols, desktop applications, and hardware. The work is methodical — map the attack surface, find what breaks, document it clearly, and help fix it.

My background spans freelance work, a corporate consultancy, programming roles, an internship, and teaching programming to kids. That range keeps the perspective honest. Security work improves when you've built the systems you're breaking and explained the concepts to someone who's never heard of them.

Outside structured engagements I run p0c.cz, a toolkit of security utilities for practitioners. I also keep active in radio, hardware hacking, and the evolving world of human augmentation.

Coverage Areas
  • Web Application & API Security
  • Network & Infrastructure Pen Testing
  • OT / ICS / SCADA Security
  • ATM & Financial Terminal Security
  • Embedded Device & IoT Security
  • Wireless: RFID, NFC, BLE, Wi-Fi, 433 MHz
  • Desktop App & Thick Client Security
  • Hardware Hacking & Physical Security
 Technical Focus
Offensive Security
Web Application Testing API Security Testing Network Penetration Testing OT / ICS / SCADA ATM & Financial Terminals Embedded & IoT Desktop / Thick Client Hardware Hacking Source Code Review Physical Security Security Report Writing
Wireless & Hardware
RFID / NFC Bluetooth Low Energy (BLE) Wi-Fi Security 433 MHz / ISM Band Software-Defined Radio (SDR) Arduino / Microcontrollers Serial / UART / JTAG Flipper Zero HackRF
Programming & Tools
Python Flask JavaScript Bash / Shell Scripting SQL Burp Suite Metasploit Nmap Git Linux
 Work Experience
Integra Czech Republic s.r.o Aug 2025 — Present
Penetration Tester Current

Contractor

Offensive security engagements covering web applications, infrastructure, APIs, and specialised domains including OT/ICS environments and ATM systems.

RoboKids Group s.r.o. Mar 2025 — Aug 2025
Lector

Contractor

Taught programming and technology to children as part of structured educational courses. Covered programming fundamentals, robotics, and computational thinking.

Accenture Feb 2023 — Nov 2024
Penetration Tester

Contractor

Security testing engagements at a large global consultancy. Web application, API, and infrastructure testing across diverse client environments and sectors.

BetonServer Sep 2022 — Aug 2023
Programmer

Contractor

Backend programming, tooling, and system maintenance. Practical development work alongside ongoing freelance security testing activity.

Trask May 2022 — Jun 2022
Penetration Tester

Internship

Internship at Trask Solutions. Exposure to enterprise penetration testing methodology and professional security consulting workflows.

Freelance 2020 — Feb 2023
Penetration Tester

Freelance

Independent penetration testing and security assessments for clients across the Czech Republic, covering web applications, network security, and security consultancy.

 Education & Background
Smíchovská Střední Průmyslová Škola a Gymnázium

Secondary technical school in Prague focused on IT, computer science, and engineering. Formal foundation in computing, networking, and software development.

Ambis University

University-level studies in business, economics, and management. Broadening perspective on enterprise and organisational contexts alongside technical security specialisation.

 Outside the Console
Security Research

Personal tools, CTF competitions, vulnerability research, and the ongoing development of p0c.cz as a practical security toolkit.

Automotive & Mechanics

Hands-on mechanical work and automotive electronics. Active in the Carsomniacs community. Cars, engines, and the hardware underneath.

Radio & SDR

Software-defined radio, PMR contests, radiosonde hunting, and 433 MHz signal exploration. Radio as both hobby and security research vector.

Human Augmentation

Five chip implants: NeXT, xLED NFC, xLED RFID, XMagic, and VivoKey Thermo. Practical exploration of what it means to extend the human body with technology.