Guillaume has joined the Sogeti ESEC Pentest practice in 2013. His interests mainly lies in UNIX operating systems, IP networks and Web insecurity. Founder of Root Me, he spends time working on hacking's challenges and CTF.
Arnaud Calmejane has been performing penetration tests for few years. He works mainly on web technologies and Linux based environments. He spends his spare time between CTF events and embedded device analysis.
Pierre-Antoine Failly has been working for the Sogeti ESEC Pentest practice since March, 2014. He started through delving into general WEB security. His main focus and interests now lie in reverse engineering. During his spare time, he attends CTF contests and recently started to do some exploit development.