I'm Petr Ziegner, a penetration tester and ethical hacker, a programmer, and a cyborg. I break systems so they can be rebuilt stronger, and I run biomodification and human augmentation experiments on myself.
I'm a penetration tester and ethical hacker. I break into systems so they can be made harder to break into. I write code, tinker with hardware, and build tools that solve real problems.
Away from the console, the thing I'm most into is biomodification. I've got a handful of implants in my hands and I follow where human augmentation is heading pretty closely. Older hobbies still hang around too: cars, and the occasional bit of radio, though I'm hardly ever on the air these days.
I'm a penetration tester with hands on experience across a wide range of target types: web applications, APIs, internal networks, cloud environments, OT and 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 have built the systems you're breaking and explained the concepts to someone who has never heard of them.
Outside structured engagements I run p0c.cz, a toolkit of security utilities for practitioners. I also keep active in hardware hacking and the evolving world of human augmentation.
Offensive security engagements covering web applications, infrastructure, APIs, and specialised domains including OT and ICS environments and ATM systems.
Taught programming and technology to children as part of structured educational courses, covering programming fundamentals, robotics, and computational thinking.
Security testing engagements at a large global consultancy. Web application, API, and infrastructure testing across diverse client environments and sectors.
Backend programming, tooling, and system maintenance. Practical development work alongside ongoing freelance security testing.
Internship at Trask Solutions. Exposure to enterprise penetration testing methodology and professional security consulting workflows.
Independent penetration testing and security assessments for clients across the Czech Republic, covering web applications, network security, and security consultancy.
Secondary technical school in Prague focused on IT, computer science, and engineering. Formal foundation in computing, networking, and software development.
University level studies in business, economics, and management. Broadening perspective on enterprise and organisational contexts alongside technical security specialisation.
My personal experience with everyday life using RFID and NFC implants, benefits, lessons, and surprises.
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A practical overview of implant technology, use cases, tools, and how I integrate them into my daily workflow.
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Thoughts on the security implications of implants and how we can protect both our data and our future selves.
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A social media profile and community presence for sharing car content, builds, and automotive passion.
Embedded builds, automation tools, hardware experiments, and practical microcontroller projects.
Companion app for the VivoKey Thermo implant, reading body temperature straight off the chip in my hand.