Steffen Klee
Security Engineer at 1&1 Mail & Media Applications SE - GMX | WEB.DE | mail.com
Frankfurt, Hesse, Germany
Summary
🤩
Rockstar🎓
Top SchoolSteffen Klee is a security engineer with 12 years of hands-on experience in application, protocol, and mobile network security, currently securing services at 1&1 Mail & Media in Frankfurt. He blends academic fuzzing and reverse-engineering research from TU Darmstadt with practical penetration testing and consulting for banks and large enterprises at EUROSEC. A skilled Android developer, he contributes to the well-known nfcgate NFC research toolkit—adding IsoDep support, a pcap exporter and key stability fixes—demonstrating both tooling and product-focused improvements. Steffen routinely builds automation for assessments, performs deep static/dynamic analysis of embedded and OS components, and codes in his spare time, reflecting a pragmatic researcher who prefers breaking things to learn how they fail.
12 years of coding experience
3 years of employment as a software developer
Technischen Universität Darmstadt
German, English
Github Skills (8)
nfc10
javas10
android10
java10
cprogramming-language9
c-language9
security8
cloning7
Programming languages (12)
Github contributions (5)
nfcgate/nfcgate
Jan 2018 - Aug 2022
An NFC research toolkit application for Android
Role in this project:
Mobile Developer (Android)
Mobile Developer (Android)Contributions:9 releases, 12 reviews, 94 commits in 4 years 7 months
Contributions summary:Steffen primarily contributed to the Android application, focusing on improvements to the NFC research toolkit. Their work included updating the Gradle and SDK, fixing compiler issues, and refactoring configuration stream handling. They also addressed issues related to sleep functionality, clone restart, and ATQA data, as well as added support for IsoDep, and improved logging and visual aspects. Additionally, they added a Pcap exporter feature.
security-auditrelayreplaysecurityandroid
nfcgate/protocol
Feb 2018 - Apr 2019
Protocol specifications and protobuf files for the NFCGate project
Contributions:3 commits, 1 PR, 1 push in 1 year 2 months
protocol-buffersgrpcspecificationsprotobuf
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