Z3tra
Web Security Researcher
Building secure applications, researching web vulnerabilities and continuously learning through practice. Looking for an apprenticeship in application security, starting September 2026.
Experience
Cybersecurity Intern · Oteria
2025Second placement, focused on web application security: reviewing applications, reproducing findings and turning them into reports someone could act on.
- Assessed web applications for common classes of vulnerability, working from an agreed scope and a written methodology
- Reproduced and documented findings with a clear impact statement and a minimal proof of concept
- Wrote remediation guidance aimed at the developers who would implement it, not at other security people
- Retested fixes and closed findings only once the underlying cause was addressed
Cybersecurity Intern · Oteria
2024First placement. Broad exposure: how a security team actually operates day to day, and how the work is organised before anyone touches a tool.
- Supported assessments by handling reconnaissance and information gathering within scope
- Set up and maintained lab environments used to reproduce issues safely
- Reviewed configurations against hardening baselines and documented the gaps
- Kept internal documentation current as procedures changed
Projects
Hackuten — A CTF platform for learning cybersecurity
2025 — presentHackuten is a capture-the-flag platform covering several areas of cybersecurity — web, reverse engineering, cryptography, forensics and more. It exists to make the first steps into the field less discouraging: challenges that teach something specific, in an order that makes sense, with infrastructure that does not get in the way.
Next.js · TypeScript · TailwindCSS · PostgreSQL · Docker · Linux · REST API
Orbyte — An end-to-end encrypted messenger
2026 — presentOrbyte is an encrypted messaging application in the spirit of Session: private conversations that do not require a phone number to start, and a server that is designed to know as little as possible. It is in active development — the parts that are built are built carefully, and the parts that are not are honestly labelled as such.
TypeScript · React · Next.js · Node.js · PostgreSQL · Docker
Batelys — Lone worker safety, one button at a time
2026 — presentBatelys protects people who work alone. You check in when you arrive, then press a button now and then to confirm you are fine. Miss a check-in — because you fell, collapsed, or simply cannot reach your phone — and an alert leaves on its own, with your position, escalating through your chain until someone responds.
TypeScript · Next.js · React · Node.js · PostgreSQL · REST API · Docker
Skills
- Languages
- TypeScript · Python · JavaScript · SQL · HTML · CSS
- Frameworks
- Next.js · React · TailwindCSS
- Technologies
- Git · GitHub · Docker · REST API · Linux · PostgreSQL
- Security tooling
- Burp Suite · Caido · OWASP ZAP · ffuf · Gobuster · Nmap · SQLMap · Hashcat · John the Ripper · Wireshark · Metasploit
- Systems
- CachyOS · Windows · macOS
Certifications
In preparation: OSCP (Offensive Security Certified Professional, OffSec, target 2026); OSWE (Offensive Security Web Expert, OffSec, target 2027).
Languages
French — Native · English — Professional
In short
- Started in security
- 2023
- Focus
- Web application security
- Currently
- Preparing the OSCP
- Looking for
- An apprenticeship, Sept 2026
Full detail, write-ups and project deep-dives at z3tra.com.

