Calle Svensson
London, England, United Kingdom
Summary
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RockstarCarl Svensson is a Security Engineer based in London with 14 years of hands-on experience in offensive security, reverse engineering, program analysis and hardware-focused research. He holds an MSc from KTH and has served on Google's internal red team before joining XTX Markets, blending enterprise threat simulation with practical exploit development. A long-time open-source contributor, Carl has improved pwntools and preeny—projects central to CTF and exploit workflows—and implemented tooling like a cyclic pattern generator and stack-cookie dumping helpers. His background spans founding a software studio, head of security roles, and consultative pentesting, showing he moves comfortably between code, process and client-facing responsibilities. Beyond typical red-team skills, he has implemented low-level syscall preload tricks and wrote a C++ bruteforce solver for an Enigma CTF challenge, reflecting deep cryptanalysis and systems-level aptitude. Colleagues rely on him for pragmatic, tool-driven approaches to uncovering complex vulnerabilities across software and hardware.
14 years of coding experience
Github Skills (21)
c-language10
ctf10
system-programming10
python10
c1110
security10
c1710
exploit10
pwntools10
cryptography10
cprogramming-language10
linux9
bruteforce9
ros8
reverse-engineering8
Programming languages (19)
Github contributions (5)
zardus/preeny
Jun 2016 - Oct 2019
Some helpful preload libraries for pwning stuff.
Role in this project:
Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:9 commits, 6 PRs, 4 comments in 3 years 4 months
Contributions summary:Calle primarily contributed to the development of preeny, a library for preloading and manipulating system calls. They implemented functions like `usleep` and `nanosleep`, and added tests for sleep-related functions. Furthermore, they focused on security enhancements, including the addition of `decookie.so` for stack cookie dumping and `deuid.c` for user ID manipulation, improving security posture. They also contributed to the `eofkiller.c` to terminate input streams on EOF.
helpfulpreload
google/google-ctf
Jul 2022 - Aug 2022
Google CTF
Role in this project:Security Engineer
Security EngineerContributions:7 reviews, 5 commits, 27 PRs in 1 month
Contributions summary:Calle contributed to the Google CTF repository by adding and modifying challenge solutions, specifically focusing on the "crypto-enigma" challenge from the 2022 event. The user wrote C++ code, demonstrating an understanding of cryptography through the implementation of a bruteforce solver for an Enigma cipher. The user's changes involved modifying code, indicating a hands-on role in solving security-related challenges within the CTF environment.
googlectfsecurityctf-challengesgoogle-ctf
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