Thibault Koechlin
CTO at CrowdSec
Nantes, Pays de la Loire, France
Summary
🤩
Rockstar🎓
Top SchoolThibault Koechlin is a security-focused CTO with 13 years of hands-on experience building and hardening web infrastructure and open-source tooling from Nantes, France. He co-created and maintained NAXSI, a high-performance WAF for NGINX, and has deep backend and security engineering contributions to notable projects like CrowdSec and Snuffleupagus. His work spans product leadership, R&D and DevOps—combining fuzzing/build tooling, secure configuration, and virtual-patching techniques to mitigate real-world exploits. As CrowdSec’s technical leader since 2020, he blends strategic product direction with continued low-level code and security fixes, demonstrating a rare mix of executive ownership and practical exploit-mitigation craftsmanship.
13 years of coding experience
7 years of employment as a software developer
Epitech
Github Skills (20)
security-hardening10
waf10
configuration-management10
c1110
security10
c1710
php10
go10
afl-fuzz10
fuzzing10
nginx10
hardening10
makefile9
regular-expression9
linux8
Programming languages (12)
Github contributions (5)
crowdsecurity/crowdsec
May 2020 - Jan 2023
CrowdSec - the open-source and participative security solution offering crowdsourced protection against malicious IPs and access to the most advanced real-world CTI.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 releases, 857 reviews, 502 commits in 2 years 8 months
Contributions summary:Thibault was involved in the initial import of code and made subsequent updates to the CrowdSec project. The commits focus on the `cmd/crowdsec-cli/backup-restore.go` file, suggesting a focus on the implementation of the backup and restore functionality. The user made significant changes in the configuration of the application and its internal logic.
protectadaptedipsctiintrusion-detection
nbs-system/naxsi
Aug 2013 - Aug 2018
NAXSI is an open-source, high performance, low rules maintenance WAF for NGINX
Role in this project:Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:11 releases, 46 commits, 71 PRs in 5 years
Contributions summary:Thibault contributed to the integration of fuzzing tools, including building the fuzzing environment and incorporating AFL (American Fuzzy Lop). They made changes to the build process and configuration files to support fuzzing. Additionally, the user addressed code issues, including removing unreachable code and fixing encoding issues, demonstrating expertise in code quality and optimization. They also added a rule to be triggered when no main rules are present.
nginxwafnaxsiperformancerules
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.