// Graz, Austria
Marcel Schnideritsch
Red Teamer Entrepreneur Organizing Hacking Competitions
01 about
I break into things for a living and for fun. Right now that means red teaming and penetration testing as a Senior Penetration Tester at Adversary, and running EmberZero, my own company for cybersecurity workshops, hosted CTF competitions and a learning platform.
The rest of my time goes into the security community: I teach the IT security elective at HTBLA Kaindorf, run KaindorfCTF, help organize the Austrian Cyber Security Challenge and the International Ethical Hacking Boot Camp in Vienna, and have been capturing flags with LosFuzzys since 2017.
Most of what I write is Python. My Macs are managed with Nix and nix-darwin, my slides are built with Typst, and my weekends are split between a terminal and a garage.
Finish a project? Meh. Start a new side project? Hell yeah.
02 work
-
2026 - now
Senior Penetration Tester Adversary GmbH
Red teaming and penetration testing, plus a few things beyond "just" pentesting. Remote, Vienna.
-
2026 - now
Founder & CEO EmberZero
Cybersecurity workshops, hosted CTF competitions and a learning platform for security teams and schools.
-
2023 - now
Teacher HTBLA Kaindorf
IT security elective for engineering college students. Home of KaindorfCTF and Project Athena.
-
2024 - 2026
Senior Pentester CANCOM Austria
Penetration testing out of Graz.
-
2020 - 2024
System Engineer BearingPoint
Advanced threat inspection, in-house CTF organizer and IT security trainer.
-
2017 - 2020
IT Professional KAGes
Endpoint protection, BitLocker, client deployment and software rollout for the Styrian hospital group.
certifications
- OSEP OffSec Experienced Penetration Tester, Dec 2025
- OSCP Offensive Security Certified Professional, Aug 2022
education
- MSc IT & Mobile Security, FH Joanneum, 2024
- BSc Software Design, FH Joanneum, 2021
03 community
-
LosFuzzys
Graz's CTF team. Member since 2017, chairman from 2022 to 2025. Recent results include 1st at CloudFest CTF and 3rd at Insomni'hack 2026.
-
Austrian Cyber Security Challenge
Member of CyberSecurityAustria since 2022, helping run the national hacking competition that feeds the Austrian ECSC team.
-
Vienna Boot Camp
Co-organizer of the International Ethical Hacking Boot Camp at TU Wien: 120+ young hackers from 12 countries preparing for ECSC.
-
KaindorfCTF
School CTF at HTBLA Kaindorf that is growing into a proper SchoolCTF, with external teams joining the local ones.
-
Shecurity
Trainer at the Women in Security summer school and workshops, most recently on pentesting with AI.
04 projects
Side projects that made it to a public repo. Some finished, most not.
-
Project Athena
An open IT security curriculum for engineering colleges: network and web security, crypto, malware analysis, pentesting, with slides built in Typst.
-
schNixOS
My Nix flake for macOS: nix-darwin hosts, modules, overlays and the app config that follows me from Mac to Mac.
-
Pay-Me
Small Flask app that turns an amount into a PayPal.me link or an EPC QR code for SEPA transfers. Docker ready.
-
ctfd-oauth
OAuth 2.0 and OpenID Connect single sign-on for CTFd, with PKCE, OIDC discovery, team mode and admin promotion by group.
-
ctfd-notifier
CTFd plugin that announces first bloods to Discord via webhooks or to Twitter. The grown-up successor of TweetTFd.
05 links
- githubgithub.com/h4ckd0tm3
- linkedinlinkedin.com/in/marcel-schnideritsch
- x / twitter@h4ckd0tm3
- instagram@_schni
- companyemberzero.com
- teamlosfuzzys.net