About Jean
Boosted by his 4+ years of experience in penetration testing and his 2 years as Head of Application Security in a world-renowned swiss private bank, Jean Lejeune can help improve your cybersecurity posture in regards of your constraints and strategies. His many years working as a cybersecurity consultant provided him a broad view of business' standards applied across industries. The risk based approach employed during his engagements, with considerations of your business context and challenges, allows him to provide feasible recommendations and objectives to ramp up your security maturity to the next level.
Passionate by cybersecurity since always, he was pleased to took part of hacking communities projects, aiming to spread and share knowledge to whom would be interested to dive into technical subjects related to this field.
Trusting Jean Lejeune is benefiting from years of experience in cybersecurity and top-notch experts living to make a virtual world safe.
French
Native or bilingual
English
Fluent
Can work on-site
Strasbourg (up to 50km), Paris (up to 100km)
Experience
- LombardodierHead of Application SecurityBANKING AND INSURANCEJanuary 2020 - November 2021 (1 year and 11 months)Genève, Switzerland☛ Appsec internal consultancy (secure software architecture - design)☛ Network security design☛ Cybersecurity assessments☛ Threat modeling (STRIDE)☛ Code review☛ Various internal developments☛ SAST fine tuning☛ Application security governance☛ SSDLC implementation (SAST/DAST)☛ Metrics monitoring (KRIs/KPIs)☛ Security champions community☛ Internal secure coding training☛ Application security awareness program
- ImmunIT sàrlPentester & project managerCONSULTING AND AUDITSJanuary 2018 - November 2019 (1 year and 11 months)Nyon, SwitzerlandI worked as a cybersecurity engineer and performed, from the kick-off to the report delivery, on various kinds of engagements approaching any aspects of IT security.☛Web application☛Workstation☛Infrastructure (segregation, segmentation, NAC, etc)☛Desktop application☛Wifi network☛Code review☛Social engineering (phishing, vishing, smishing)☛Secure coding☛Vulnerability researchUpstream my pentester position, I also worked on internal projects where I developed and dockerized an ERP whose aim was to manage clients' security equipment as well as clients' time balance. By the same token, I also revamped the whole phishing platform, allowing to seamlessly deploy phishing campaigns. Finally, I published a few open-source tools on the ImmunIT's Github for the sake of our security audits. Some side-projects are also been developed by myself but not disclosed such as a reconnaissance framework and an API enumeration tool.
- BSSIPentester & Course instructorCONSULTING AND AUDITSSeptember 2016 - December 2017 (1 year and 4 months)Paris, FranceI 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.
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Education
- MSc - Computer SecurityUniversity of Kent2016During this year, I had the opportunity to participate at several modules which help me to improve my security and english skills in different domains such as : ➢ [CO874] Networks and Network Security ➢ [CO892] Advanced Network Security ➢ [CO876] Computer Security ➢ [CO834] Trust, Security and Privacy Management ➢ [CO899] System Security ➢ [CO883] Systems Architecture ➢ [CO880] Project and Dissertation ➢ [CO885] Project Research ➢ [CO871] Advanced Java for Programmers ➢ [LZ600] Advanced English for Academic Study in the Applied Sciences For further detail about these modules, please follow the link below : http://www.kent.ac.uk/courses/modulecatalogue/modules/
- Master of Information TechnologyEPITECH - European Institute of Technology2017Epitech is a school founded in 1999. The program includes two study cycles. The first one, which lasts three years, results in a Bachelor's degree. Upon completion of the subsequent two-year cycle, students are awarded the Computer Expert diploma. ➢ Applied mathematics ➢ Data structures : Linked lists (simple, double, circular), Stacks, Queues, Symbol tables, Hash Tables, BST ➢ Algorithms : A*, Dijkstra, NPI, sorting (selection, insertion, merge, quick) ➢ Unix System programming : C, Linux kernel, Multi-threading, Multi-processing, Shared memory, Networking communications (TCP/IP), ... ➢ Object Oriented Programming : C++, Java, UML (organic and functional analysis) ➢ Graphics Programming ➢ Security / Code analysis ➢ Business ➢ Project management ➢ Networking : LANs, WANs, OSI, IP, routing ➢ Standard SQL ➢ French writing (professional / business context)
Certifications
- Ethereum Blockchain Developerb9lab
- NSE 1 - 2 - 3 Network Security AssociateFortinet2018
Skill set (37)
Categories
- Other