I’m Raphaël, an embedded and systems engineer in Lille, France, and a certified ingénieur. I work in low-level C and C++ on FreeBSD, Linux and Yocto: security daemons, custom distributions, and the software underneath the software.
Most of what I know came from production bugs. You get a core dump, a customer report, and no reproduction, and you work backwards from there. That kind of debugging is a lot of what I end up writing about.
I also teach algorithms and C at JUNIA ISEN Lille, where I studied. I take freelance work, on-site in Lille or remote.
Experience #
StormshieldR&D Systems Engineer
Jan. 2025 – Present · Lille, FranceSecurity daemons in C and C++ on FreeBSD, for the SNS firewall line. Deep packet inspection: flow decryption and antivirus analysis on live traffic. A good part of the job is diagnosing field issues from core dumps and customer reports. I also built the internal framework we use to automate the developer workflow, which cut how long a build-and-test cycle takes for the whole team.
JUNIA ISEN LilleAdjunct Lecturer
Sep. 2024 – Feb. 2025 · Sep. 2025 – Feb. 2026 · Lille, FranceAlgorithms and C programming for engineering students. I write the course material and the exams, and supervise student projects from design through to delivery.
CapgeminiSoftware Engineer
Sep. 2024 – Dec. 2024 · Lille, FranceMigrated a live Java business application from Java 6 to Java 17, with minimal downtime and no functional regressions. Also implemented integer linear programming algorithms for path finding.
AlchemyCorpFreelance Software Engineer
Dec. 2023 – Jan. 2025 · RemoteAn automated buying application in C and C++ for a client with strict latency requirements. The backend held more than 10,000 concurrent connections and distributed events with millisecond-level timing.
ThalesSoftware Engineering Intern
May 2023 – Aug. 2023 · Tubize, BelgiumBuilt an end-to-end testing framework from scratch for a military communication project (MACS), in C, C++, Rust and Robot Framework. Wrote a custom Wireshark dissector so we could read the proprietary protocols.
Education #
JUNIA ISEN LilleMaster of Engineering
2021 – 2024 · Lille, FranceData structures, algorithms, embedded programming on PIC and STM32, and networking. Secretary of the TechISEN association.
AdimakerPreparatory Cycle
2019 – 2021A preparatory programme built around projects rather than lectures.
Credentials #
Certified Stormshield Network AdministratorCSNA
Dec. 2025Stormshield network security and firewall administration.
Certified Engineer (Ingénieur)CTI — France
2024The state-recognised engineering title, awarded on graduation from an accredited French school.
Cambridge English FirstFCE — C1
July 2018C1 level. ID AGL175726.
Toolbox #
C
C++
Python
x86-64 assembly
FreeBSD
Linux
Yocto / BitBake
Zephyr RTOS
GDB
Clang / LLVM
Git
KiCad
STM32CubeIDE