JAROSLAV MUSIL
Cybersecurity & Web Development
Czech cybersecurity specialist focused on red teaming, penetration testing, and secure web development.
What I've done
By the numbers
What I'm good at
Red-Teaming
I simulate full-blown cyberattacks. It's not just about popping shells; it's about showing how real-world threats actually hit your people and tech.
Infra Pentesting
I dive deep into networks and systems to find holes and patch them up before the bad guys get in.
Mobile Security
Tearing apart mobile apps to harden them up before they ever hit the app stores.
Team Ups
I work with Mitel a.s. and others on red team and pentest actions to test real infrastructure against serious attack paths.
My Crew
TwoFace, z.s.
I'm heavily involved with TwoFace, z.s. as a tech lead. I do a mix of red teaming and pentesting, plus I built and run our digital infrastructure.
- Running Red Team ops & Pentests
- Coding full-stack web apps
- Securing architecture & hardening servers
My Web Studio
Star Solution
At Star Solution we build websites and web apps that look sharp, load fast, and stay easy to run. We focus on clear communication, quality execution, and secure builds that can grow with the client.
- Web apps, dashboards & internal systems
- Personal websites, company sites & landing pages
- Custom secure builds with AI integrations
Who am I?
I have been dedicated to the world of IT for over six years, specializing in offensive security. My world revolves around uncovering vulnerabilities before they are exploited by malicious actors. I actively participate in Capture-The-Flag (CTF) competitions, testing my limits in cryptography, reverse engineering, and web exploitation. When I'm not at the keyboard, you'll find me at the gym. I combine my studies with MMA training
Offsec
Pentesting, red teaming.
Web Dev
I make modern and professional websites that look sharp and work well.
MMA & Mindset
I train MMA and go to the gym to stay sharp, disciplined, and consistent.
My Journey
Entering the National Arena
Found out about the Czech Cyber Security Competition and fought my way through the qualifiers.
Haxagon Skirmish Champ
Took 1st in the Haxagon Skirmish CZ regionals (snagged a Meta Quest 3!) and grabbed 5th place at the national finals in Prague.
National Comp Finalist
Went up against the best young hackers in Brno, finishing 11th solo and 16th with my team.
National Comp 2025
Jumped back into the National Cyber Security Competition and crushed the regionals for 1st place.
National Cyber Security Challenge
Fought hard at the national finals of the Cyber Security Challenge and walked away with 2nd place overall.
Haxagon Skirmish Return
Back at Haxagon Skirmish. Won the regionals again and took home 2nd place in the grand finals.
Elite Training – ECSC
Selected for Cyber Competition Summer School, an intensive training program preparing for the European Cyber Security Challenge.
Selected Work
TwoFace, z.s.
Built the official site for TwoFace. Besides coding it, I also run red team ops and pentests for the crew.
MMA Liberec
A slick, fast site for a martial arts gym. Super optimized for mobile so they can update schedules on the fly.
Sport For Hope
A charity platform focusing on real stories and making it super easy for people to donate.
Star Solution
Company site for Star Solution, my web studio focused on fast websites, dashboards, and web apps that are easy to run.
Certs & Crew
Star Solution s.r.o.
Working as a web developer and web designer at Star Solution s.r.o.
TwoFace, z.s.
Running point on red teaming, pentests, and web dev.
Czech Cyber Team
Rep'ing the Czech Republic in hackathons and cyber comps everywhere.
TryHackMe Jr. Pentester
Grinded through the whole TryHackMe offensive security track.
Haxagon Skirmish
Won the regional round and finished 2nd at the national Haxagon Skirmish finals.
National Competition
Finished 2nd overall at the national cyber security competition finals.