Stéphane Lesimple
CISO - Security Operations Center & Abuse Dept. Leader
Greater Lille Metropolitan Area France
Summary
🤩
Rockstar🎓
Top SchoolStéphane Lesimple is a seasoned systems engineer and security leader with 16+ years of experience, currently serving as CISO and head of OVH’s Security Operations Center and Abuse Department, protecting 700K customers from DDoS, botnets, phishing and large-scale abuse. He combines deep low-level knowledge of operating systems, filesystems and performance trade-offs with hands-on development skills across C, Python, shell and automation, believing that great developers make better sysadmins and vice versa. At OVH he built detection and response capabilities that anticipate attacks before they fully materialize, and contributes to open-source tooling such as improvements to OVH’s the-bastion SSH access project. His background spans embedded firmware and large carrier platforms (Livebox, VoIP, Solaris/Linux farms), giving him rare fluency in both product R&D and production reliability at scale. Collectedly, he blends pragmatic engineering, security-first thinking and a penchant for low-level debugging to harden complex distributed systems.
16 years of coding experience
4 years of employment as a software developer
Graduate Engineer, IT, Graduate Engineer, IT at Ecole nationale d'Ingénieurs de Brest
French, English, Spanish
Github Skills (10)
it-security10
ssh10
security10
scripting9
testing9
shell9
script9
sh9
bash8
documentation7
Programming languages (12)
Github contributions (5)
ovh/the-bastion
Oct 2020 - Dec 2022
Authentication, authorization, traceability and auditability for SSH accesses.
Role in this project:
Backend & Security Engineer
Backend & Security EngineerContributions:49 releases, 95 reviews, 460 commits in 2 years 2 months
Contributions summary:Stéphane contributed to the security and functionality of the SSH access system by adding and testing basic functional tests related to push events. They also enhanced documentation, fixed links, and updated the version of the software to v3.00.00. Further contributions involved fixing typos, dynamically retrieving the software version for documentation, and adding a FAQ entry. Finally, the user improved the OS package checking scripts by adding qrencode-libs for RHEL/CentOS.
bastionauthorizationuser-managementsecurityssh
speed47/btrfs-progs
Dec 2015 - Mar 2019
Development branches of btrfs userspace tools.
Contributions:15 pushes, 27 branches in 3 years 3 months
branchesgitpoduserspacedevtoolchild-process
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