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Tristan Joncour, cyberdefence, infrastructure, security operations

ENSIBS Vannes Luxembourg

Engineering student in cyberdefence at ENSIBS, in Vannes, France, on a work-study contract at ASSIA, in Quimper, in the technical infrastructure team.

I moved towards security for a simple reason: I like understanding how a system works, spotting where it gives way, and finding what it takes to hold it together. I came up through development, system administration, networking and security, and it is that whole picture that interests me today, rather than any single tool.

When a constraint keeps coming back, I write the thing that makes it go away. Most of the projects below started exactly like that: a budget melting away without me seeing it go, passwords scattered around with no vault to trust them to.

Day to day

Running and analysing security logs through a SIEM, event detection, configuration audits, system administration and network work.

Alongside that, my personal and academic projects push me deeper into Python, Linux, applied cryptography and security. What I enjoy is the step from theory to practice: understand the problem, experiment, analyse, then harden what is already there.

Where I am headed: Luxembourg, September 2027

When I finish my engineering degree, in September 2027, I am aiming for Luxembourg, with three years of work-study experience in infrastructure and security behind me.

I am looking at roles in cybersecurity, infrastructure, security operations and systems and network engineering. To keep learning, build real expertise, and contribute to the security of information systems.

Background

Experience. Since September 2025, founder and CTO of CoasterSystems: electronics, ESP32 firmware, IoT and the MicroCoaster web app. Since December 2024, cyber defence engineering apprentice at ASSIA in Quimper: SIEM, monitoring, network security. September to October 2024, apprentice at Avril in Bruz. January to March 2024, research assistant at the RI CODE lab, Bundeswehr University Munich (hardware prototypes, resilient communication protocols). December 2023 to January 2024, store assistant at E.Leclerc in Pont-l'Abbé. 2021 to 2024, three summers in a campsite kitchen in Bénodet. 2017 to 2021, youth town councillor in Combrit.

Education. Engineering degree in cyber defence at ENSIBS, Vannes, 2022 to 2027. DUT, integrated preparatory cycle, IUT de Vannes, 2022 to 2024. STI2D baccalaureate with honours, Le Likès, Quimper, 2020 to 2022.

Certifications: TOEIC, 785 and up, B2. Le Robert certificate, advanced level. Lifeguard and first aider: BNSSA, PSE1 and PSE2. Driving licence, ready to go anywhere in the world. Interests: weight training, enough to build my own tracking app, ÆSTHETIC; coasters, Europe's parks and the dream built in miniature with MicroCoaster; video and 3D; writing, with my first novel, Le Redoublant, online. Languages: French native, English B2, German and Spanish basic.

Projects

ÆSTHETIC, mobile, health, strength, in progress. My own health app: training, nutrition, sleep and an AI coach. All in one place, to become the best version of myself. Nutrition, sleep, AI coach, Flutter.

BeVannes, mobile, geography, photo, game. BeReal meets GeoGuessr: a spot drawn at random every day, and the photo only counts if GPS says you were there. Flutter, Firebase, geolocation.

BodyCount, mobile, adult. An encrypted personal journal, offline, on Android. No server, no account, no telemetry. Flutter, SQLCipher, biometrics.

CyberSas, VPN and Android, in progress. My own VPN, written end to end. A server that relays without reading, and the admin's fingerprint decides who gets in. Go, Noise IK, Ed25519, Flutter.

KyrlCut, web, mobile, hair salon, private repository. Online booking for a hair salon, by invitation only. Quarter-hour slots, an email reminder the day before. Express, MySQL, bcrypt.

MicroCoaster, web, embedded, coaster. A board designed from scratch, its firmware, and the web app that drives it. PCB design, ESP32, PlatformIO, WebSocket, Node.js, Socket.IO, MySQL, HTTPS.

Serenity, web, mobile, security. Your password vault, hosted at home. An agent watches for breaches, and rotates the ones you trust it with. Zero knowledge, libsodium, self-hosted, AGPL v3.

Smart Budget, mobile, finance. Stop spending blind, and stop dipping into the savings. The account read over PSD2, sorted and encrypted on the phone. Flutter, PSD2, SQLCipher.

Stack

Security and monitoring

LogPoint, Centreon, Fortinet, Wireshark

Systems and virtualisation

VMware, VirtualBox, Proxmox, Linux, Debian, Windows Server

Microsoft environment

Microsoft 365, Exchange, Microsoft Entra ID, PowerShell

Operations

Jira, Docker, Nginx, Git, GitHub Actions

Languages

Languages

Web and mobile

Web and mobile

Data

MySQL, SQLite, MongoDB, Firebase

Security and embedded

Security and embedded

3D design and printing

Fusion 360, Cinema 4D, Creality

Video and graphics

Filmora, After Effects, Premiere Pro, Photoshop

Assistants and prompting

Claude, ChatGPT, GitHub Copilot

Contact

Email tristanjoncour29@gmail.com     Chat on Discord, cybertrist     Follow on Instagram, @cybertrist     Listen on Spotify to what I code to

tristanjoncour29@gmail.com