Marius Karstedt
Working Student Penetration Testing
Frankfurt, Hesse, Germany
Summary
👤
Senior🎓
Top SchoolMarius Karstedt is an IT security and web development professional with a decade of hands-on experience building startups and secure applications from Frankfurt. Currently a Working Student in Penetration Testing at Hitachi Rail and Head of Development at repaste GmbH, he blends offensive security expertise with practical back-end engineering. His background includes multiple internships in pentesting, incident response and cloud security at Eviden, plus founding roles that drove digital transformation and product delivery for SMEs. An active open-source contributor, he strengthened a popular PHP router by adding CSRF protections and robust client IP validation—showing attention to practical, deployable security improvements. He holds a B.Sc. in Informatics/Cyber Security and is pursuing an M.Sc. in IT Security at TU Darmstadt, combining academic depth with entrepreneurial grit. Notably, his self-taught start in Java game add-ons and early mobile and web projects reflects a long-standing habit of learning new stacks to solve real problems.
9 years of coding experience
2 years of employment as a software developer
Technischen Universität DarmstadtSiemens Professional EducationAbitur, Leistungskurse Informatik & Biologie, Abitur, Leistungskurse Informatik & Biologie at WöhlerschuleBachelor of Applied Science, Informatik, Cyber Security, Bachelor of Applied Science, Informatik, Cyber Security at DHBW Mannheim
English, German
Github Skills (6)
url-routing10
csrf-protection10
php10
middleware10
request-handler10
user-input10
Programming languages (7)
Github contributions (5)
skipperbent/simple-php-router
Mar 2021 - Mar 2021
Simple, fast and yet powerful PHP router that is easy to get integrated and in any project. Heavily inspired by the way Laravel handles routing, with both simplicity and expand-ability in mind.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:37 reviews, 56 commits, 29 PRs in 4 days
Contributions summary:Marius focused on enhancing the functionality and security of the PHP router. Their contributions primarily involve implementing CSRF token handling, including adding checks for various request methods and headers. They also worked on improving IP address retrieval, by adding and validating different header methods to identify client IP addresses.
cmsabilityphp-router-standaloneinput-handlermind
DeveloperMarius/simple-php-router
Mar 2021 - Dec 2022
Contributions:27 releases, 1 review, 145 commits in 1 year 8 months
integratedphpabilityroutingphp-router
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