Stanislas Lejay
Security Researcher at Dataflow Security
Saitama Prefecture, Japan
Summary
👤
Senior🎓
Top SchoolStanislas Lejay is a security researcher with 11 years of hands-on experience in reverse engineering, hardware pentesting, and automotive security, currently working at Dataflow Security in Japan. He has a strong track record of practical research—from Android 0-click exploits at L3 Trenchant to ECU and firmware assessments at WhiteMotion and NCC Group—and has presented at high-profile conferences including 34C3 and Black Hat Europe. An active contributor to the angr binary-analysis ecosystem, he blends low-level programming and symbolic execution expertise with real-world pentesting skills. Equally comfortable in white- and black-box engagements, he also pursues social engineering and physical red-team work, bringing a multidisciplinary perspective to system compromise and defense. Trained at EPITA, Stanislas combines academic rigor with creative problem solving, often turning CTF-inspired techniques into production-grade research.
11 years of coding experience
11 years of employment as a software developer
Engineer's degree, Computer and Systems Security, Engineer's degree, Computer and Systems Security at EPITA: Ingénierie Informatique
English, Japanese, French
Stackoverflow
1,077reputation
590kreached
20answers
18questions
Github Skills (15)
symbolic-execution10
reverse-engineering10
python10
binarydiff10
angr10
analyse9
debug9
debugging9
documentation8
spritekit6
shell6
swift6
macos6
security6
printf6
Programming languages (6)
Github contributions (5)
angr/angr-doc
May 2016 - Sep 2016
Documentation for the angr suite
Role in this project:
Back-end Developer
Back-end DeveloperContributions:19 commits, 7 PRs, 19 comments in 3 months
Contributions summary:Stanislas primarily contributed to solving reverse engineering challenges related to the "baby-re" program. They implemented a solver using the angr framework, demonstrating expertise in symbolic execution and program analysis. The contributions involved writing Python scripts to analyze and solve security puzzles. The user also added a HackCon example, demonstrating wider knowledge of binary analysis.
angrsuite
angr/angr
May 2016 - Jun 2016
A powerful and user-friendly binary analysis platform!
Role in this project:Back-end Developer
Back-end DeveloperContributions:20 commits, 4 PRs, 8 comments in 23 days
Contributions summary:Stanislas primarily contributed to the `angr` project by modifying the core functionality of `angr/path_group.py`, `angr/surveyors/explorer.py`, and `angr/exploration_techniques/__init__.py`. Their work focused on refining the `pg.explore` method, handling path addresses, and addressing typos. Furthermore, the user added documentation in `angr/analyses/cfg_accurate.py` and `angr/analyses/cfg_base.py`, suggesting an understanding of the internal workings of the project.
pythonbinary-analysisanalysisuser-friendlyangr
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