đź‘‹ Hello, welcome to my portfolio

I am Matthieu Greiner
Cybersecurity Engineer.

Engineering student at EPITA specializing in Cybersecurity. Bridging technical depth and security engineering, I am targeting SecOps & DevSecOps roles — with a long-term goal of working in the US.

About Me

Pursuing my Master's at EPITA, majoring in Cybersecurity.

Passionate about low-level programming, systems security and infrastructure — from kernel internals to cloud-native environments.

Currently building hands-on security engineering experience through apprenticeships at SFR Business and intuitem, with a long-term goal of breaking into the US security market.

EPITA Cybersecurity
Bangkok Intl. Exchange
Security Engineer Long-term SecOps Goal

My Journey

2026 - 2028 Apprenticeship

DevSecOps Engineer (Apprentice) more

intuitem · Vélizy

Contributing to CISO Assistant, the world's #1 open-source GRC platform. Full-stack development with Django & Svelte, DevSecOps, Kubernetes, and multi-cloud infrastructure.

2025 - 2026 Apprenticeship

SSI Engineer (Apprentice) more

SFR Business · Paris

IT Governance, Risk Analysis, and internal AI development. Built security tooling in Go, automated GRC workflows, and contributed to NIS2/DORA compliance efforts.

2025 International Exchange

Chulalongkorn University (Thailand)

Exchange semester in Bangkok focusing on advanced Cybersecurity and Cloud Computing.

2023 - 2028 Education

EPITA - School of Engineering & CS more

Specializing in Cybersecurity with a focus on systems and networks.

Technical Arsenal

C
C Programming
Python
Linux / Bash
Network Security

Certifications & Methodologies

CCNA

In Prep

Cisco Associate

Network fundamentals and security automation.

EBIOS RM

Certified

Risk Manager

ANSSI standard for risk assessment and management.

Featured Projects

Selection of academic and personal work.

OCR
C / AI / Computer Vision

OCR Word Search Solver

A robust software suite developed to solve word search puzzles directly from images. It bridges low-level system programming with advanced character recognition and grid-solving logic.

Technical Core:

  • 96%+ C Implementation: High-performance code with optimized Makefile management.
  • Computer Vision: Custom preprocessing pipeline for grayscale conversion and grid straightening.
  • Neural Network: Built-from-scratch AI engine for identifying characters in the grid.
  • GUI Integration: Developed an interactive interface using GTK 3.0 and SDL for image loading and visualization.
Source Code
MAZIC
Python / Professional Dev Workflow

Mazic

A cooperative game where mages traverse a magical labyrinth infested by shadow creatures to recover artifacts of power. Trapped souls haunt the halls, ready to prevent newcomers from escaping.

Technical Excellence:

  • Full Python implementation (93%) with strict dependency management (Poetry).
  • Clean Architecture: Segregated modules for assets, source, and documentation.
  • Governance: Adherence to Conventional Commits and Google-style docstrings.
  • Quality: Integrated logging system and automated documentation (Pdoc3).
View Project

Beyond the Keyboard

Guitar

Passionate about music and riffs on electric guitar.

Game Dev

Developed a complete game from scratch in my first year of integrated prepa.

Coding

Exploring new languages and automating daily tasks.

Open School Days

Active representative at EPITA open days and higher education fairs, presenting the school's programs to prospective students.

CTF & Competitions

Keeping an eye on cybersecurity competitions and CTF events, sharpening offensive and defensive skills beyond the classroom.

Want to chat about security, music, or code?

Send me an email