Jean Lejeune

consultant en cyber-sécurité

Peut se déplacer à Paris

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  • 2.3522219000000177
Proposer un projet La mission ne démarrera que si vous acceptez le devis de Jean.
Proposer un projet La mission ne démarrera que si vous acceptez le devis de Jean.

Localisation et déplacement

Paris, France
Peut travailler dans vos locaux à
  • Paris et 50km autour


  • E-mail vérifié



Github : Nitr4x Nitr4x
  • 17 Repos
  • 2 Gists


Compétences (20)

Jean en quelques mots


I’m, in a first place, a programmer, and master several languages such as C, C++, NodeJS, Java and bash. Moreover, I have quite decent knowledge in ASM, Go, Python, … However, programming is for me more a tool than a passion. Indeed, it allows me to create any kind of program for the sake of my curiosity and my needs.

Upstream, I have an MSc in computer security and a bunch of skills in many domains applied to information security :

- Network and network security
- Computer and system security
- Trust and privacy management
- Systems architecture (if you want to create a new file system, I’m the man !)
- Cryptography
- Malwares analysis
- ….

I’m particularly interested in social engineering, Doxing, zero days discovery, CTF and privacy / anonymity area.

Feel free to contact me for further information.

Jean Lejeune



Conseil & audit


Paris, France

septembre 2016 - Aujourd'hui

I was integrated within the pentesting team and participated to multiple pentestings approaching many aspects of this area e.g. System, web application, mail server, cryptography, etc. Moreover, I was commissioned to work on the management of an internal project and its structural aspect. Lastly, I put in place several tools whose aim were to improve the efficiency and productivity of the company.


High tech

Software developer


mars 2015 - septembre 2015

Development of a software used to control the building access according to several authentication methods (QRCode, LDAP, …). Moreover, a VOIP system has been implemented in order to assist the user in case of problem.


High tech

Teaching assistant

Strasbourg, France

janvier 2014 - août 2014

I worked for my school, Epitech, as a teaching assistant alongside my studies. This job consisted of giving technical courses in C, SQL, and Unix system programming. I helped students on their projects by answering questions and challenging them to go above and beyond the provided guidelines. Additionally I assessed their work once completed, invigilating exams and setting up conferences.
  • C/C++
  • Unix system programming support
  • SQL
  • pedagogy
  • methodology
  • organization
  • supervisor

Reymann Communication

High tech

Full Stack developer

Strasbourg, France

août 2013 - janvier 2014

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