Steffen Jaeckel
Kernel Network Engineer at EYE T Services
Freiburg im Breisgau, Baden-Württemberg, Germany
Summary
🤩
Rockstar🎓
Top SchoolSteffen Jaeckel is a Kernel Network Engineer with 16 years of experience building secure, low-level systems and embedded software from Freiburg, Germany. He combines deep C systems expertise with applied cryptography—evidenced by sustained contributions to LibTomMath, LibTomCrypt and U-Boot where he implemented password hashing and hardened crypto handling. As owner of EYE T Services and a long-time open-source maintainer, he focuses on reliability, memory-safety fixes, and pragmatic refactors across networking and XMPP stacks (libstrophe, profanity). Comfortable across hardware-near code and network kernels, he brings a track record of improving security posture, adding unit tests, and making legacy codebases compile cleanly on modern toolchains. A pragmatic engineer, he often surfaces subtle issues (compiler warnings, stack overflows, cross-target quirks) before they become production problems.
16 years of coding experience
10 years of employment as a software developer
Dipl.-Inform. (FH), Computer Engineering, Dipl.-Inform. (FH), Computer Engineering at Fachhochschule Furtwangen - Hochschule für Technik und Wirtschaft
German, English, French
Github Skills (25)
debugging10
debug10
xmpp10
sha10
c-programming10
c1110
integer-arithmetic10
security10
c1710
u-boot10
sys10
openssl10
cryptography10
embedded10
number-theory10
Programming languages (19)
Github contributions (5)
libtom/libtomcrypt
Oct 2009 - Jan 2023
LibTomCrypt is a fairly comprehensive, modular and portable cryptographic toolkit that provides developers with a vast array of well known published block ciphers, one-way hash functions, chaining modes, pseudo-random number generators, public key cryptography and a plethora of other routines.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 releases, 47 reviews, 1463 commits in 13 years 5 months
Contributions summary:Steffen has been focused on fixing warnings and improving existing code within the LibTomCrypt project. They have made a series of commits related to removing compiler warnings, such as those arising from compilation with specific flags, and have also addressed issues like potential stack overflows. The contributions show a focus on code quality and bug fixes, with involvement across various ciphers, test cases, and utility modules within the cryptographic library.
arraypublic-key-cryptographycryptographiccryptanalysisciphers
libtom/libtommath
Oct 2009 - Oct 2022
LibTomMath is a free open source portable number theoretic multiple-precision integer library written entirely in C.
Role in this project:Back-end Developer
Back-end DeveloperContributions:19 releases, 58 reviews, 723 commits in 13 years 3 months
Contributions summary:Steffen primarily contributed to the LibTomMath library by addressing various issues and improving the code base. The user's commits include bug fixes related to integer manipulation, and radix conversions. They also worked on optimizations, and ensuring the library functioned properly across different compilation targets and configurations.
libtommathmathmpimulti-precisioninteger
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