Research Engineer – Cybersecurity, RL Environments

. Design and implement RL environments simulating cybersecurity scenarios .

Posted 9/25/2026full-timeParis • FranceMid-LevelSeniorWebsite

Tools & technologies

CloudCyber SecurityDockerKubernetesPythonC++

Key responsibilities & impact

Design and implement RL environments simulating cybersecurity scenarios
Build pipelines and infrastructure generating synthetic cybersecurity training instances at scale
Conduct experiments and evaluations of model capabilities, from quick prototypes to controlled benchmark runs
Own infrastructure including containers, sandboxes, VMs, cloud deployments, and Kubernetes orchestration, managed as code
Partner with researchers and security specialists to turn domain expertise into reproducible environments and datasets
Write clear, efficient Python code and enforce testing, code review, and CI/CD practices
Develop model capabilities in vulnerability discovery and remediation, security analysis, and incident response across offensive and defensive cybersecurity
Feed results into production training runs for frontier models

What you’ll need

Hands-on expertise in offensive and/or defensive cybersecurity, including vulnerability analysis, web/network/cloud security, secure coding practices, and SOC
Strong software engineering skills with clean, reliable, well-tested code
Fluency in Python
Comfort reading lower-level languages such as C/C++ for vulnerability analysis
DevOps experience with Docker, Kubernetes, cloud deployments, and sandboxed or simulated environments
Working knowledge of RL techniques and LLM training methodologies, or strong motivation to develop it
Self-starter, low-ego, collaborative, and comfortable working across research and engineering
CTF, cyber-range, or bug-bounty experience is a nice-to-have
Research background in cybersecurity or another experimental discipline is a nice-to-have
Prior experience building RL environments or large-scale ML training infrastructure is a nice-to-have
Relevant open-source contributions and projects are a nice-to-have

Comp & perks