CyberSecurity, Platform Security Engineer

About the Role

Mistral is seeking a Platform Security Engineer to architect and maintain the security posture of our rapidly scaling AI infrastructure and application lifecycle. You will embed robust security controls into our continuous integration and deployment pipelines, infrastructure environments, and developer workflows—enabling our research and engineering teams to move fast while staying secure. This role bridges security and engineering, making secure practices invisible by default and automatic across every layer of our stack.

About Mistral

Mistral provides full-stack AI solutions—from frontier models to developer tools, applications, and compute. We partner with enterprises across high-stakes industries including finance, manufacturing, defense, healthcare, and the public sector. Our distributed teams across Europe, North America, Asia, and the Middle East are collaborative, creative, and committed to driving innovation.

Responsibilities

• Lead threat modeling and risk prioritization in system-design reviews for core infrastructure and new products.
• Own end-to-end vulnerability management across CI/CD pipelines and runtime environments, covering both infrastructure and applications.
• Secure container orchestration deployments and containerized workloads, implementing hardening measures to prevent lateral movement across distributed systems.
• Define and enforce Infrastructure-as-Code security by building guardrails and integrating policy-as-code into deployment pipelines.
• Design and execute a comprehensive security tooling strategy, managing solutions for cloud-native application protection, cloud security posture, static code analysis, dependency scanning, secrets management, and vulnerability tracking.
• Enable developers by building secure defaults, streamlining remediation workflows, and creating actionable security guidelines.
• Build security automation to scale alongside growth, minimizing manual overhead while establishing pragmatic security practices.

Requirements

• Five or more years of experience in platform security, security engineering, or cloud security, ideally as an early security hire in a fast-scaling environment.
• Deep expertise in container orchestration and container security; strong experience securing Infrastructure-as-Code across major cloud providers.
• Strong programming and scripting skills in Python, Go, or similar languages to build security automation and integrate security tools into developer workflows.
• Extensive hands-on experience deploying and tuning modern security tooling, with a pragmatic approach to vulnerability management and threat modeling.
• Proven ability to communicate and partner with developers and researchers to embed security without creating engineering friction.

Benefits

Mistral offers a comprehensive benefits package designed to support well-being, growth, and work-life balance. Benefits vary by country and may include healthcare coverage, parental leave, retirement plans, relocation support, wellness programs, meal and transportation allowances, and other location-specific perks. Refer to the Benefits page for location-specific details.

Location

Paris