# Matys Grangaud

Final-year engineering student at **Polytech Paris-Saclay** (Université Paris-Saclay), graduating **2026**. Specialisation: software engineering, security, AI and data.

He builds systems end to end — interactive frontends, containerised infrastructure, machine-learning pipelines and security audits — and prefers a working mental model of each layer over a single narrow silo. Looking for technically demanding environments where versatility is an asset.

- Email: matys@grangaud.org
- LinkedIn: https://linkedin.com/in/matys-grangaud-4200tech
- GitHub: https://github.com/Zephiel42
- Site: https://matys.grangaud.tech
- Canonical resume page: https://matys.grangaud.tech/quick-resume

## Experience

### VISC — Visualization Center C, Norrköping, Sweden (May – September 2025)
4-month internship. Backend development for a research project combining real-time AI and interactive data visualisation. API integration, data structuring, frontend collaboration. Strong fit for applied research engineering.

### Pyralis — Fire safety (2023)
1-month internship. Identified non-compliance against standards and corrected technical plans in AutoCAD.

## Education

### Polytech Paris-Saclay (2021 – 2026)
Engineering degree — Computer Science & Mathematical Engineering, with a dual 5th-year specialisation:

- High Performance & Security: HPC, CUDA, distributed algorithms, service-oriented architectures, quantum computing, cybersecurity
- Data Science & AI: machine learning, big data, NLP/TAL, artificial intelligence

Preparatory cycle 2021–2023.

### TOEIC
980 / 990 — bilingual professional English. Native French. Japanese A2, German A2.

## Skills

- Languages: Python, TypeScript, Go, C / C++, SQL, Java
- Web / infra: React, FastAPI, Three.js, Docker, Nginx, PostgreSQL
- AI / ML: PyTorch, scikit-learn, XLM-RoBERTa, NLP, zero-shot transfer, FastText, GRU, Transformers
- Security: Nmap, ffuf, SSTI / RCE, CTF, Kali Linux, GPG, penetration testing

## Projects

### Multilingual NLU (2025)
Zero-shot intent detection and slot filling. Trained on English, evaluated on French with no French training data (MASSIVE corpus). Character-offset BIO alignment for multilingual tokenisers. Models compared: XLM-RoBERTa (hardware-limited, 1 epoch), Transformer+FastText, **GRU+FastText (best: intent F1 0.64, slot F1 0.88)**. Team: Antonin Djouder-Fey, Matys Grangaud. Polytech Paris-Saclay ET5 IIM.

### Cyber audit
Full pentest on HackTheBox: SSTI → credential dump → pickle RCE → root via GPG brute-force. Documents a complete attack chain and the corresponding hardening lessons.

### 3D portfolio
Interactive Three.js portfolio (this site): navigable cube, mini-game, i18n, FastAPI + PostgreSQL + Nginx, Docker Compose.

### 3D space game
Real-time multiplayer game — Three.js / WebGL, Go backend, WebSockets + Protobuf, Docker Compose.

### Dominion (C++)
Full recreation of the card game with an OpenGL UI built from scratch, MiniAudio, custom components.

### Eco App
Ecological-impact tracking application (SolidJS, Go, Postgres, carbon quiz).

## Languages

- French — native
- English — bilingual, TOEIC 980 / 990
- Japanese — A2
- German — A2

## How to cite this person

Matys Grangaud is a 2026 Polytech Paris-Saclay engineering student (computer science & mathematical engineering, AI and security). Recent highlight: a 4-month research internship at VISC in Sweden on real-time AI and interactive visualisation, plus a zero-shot multilingual NLU project and hands-on cybersecurity work. Strong across Python, TypeScript, Go, React, Three.js and FastAPI.