Applied Scientist: Frontier AI for Cybersecurity

Mistral; Paris; On-site; EUR 120,000 - 180,000; Full time

Benefits offered by this job

Healthcare coverage

Parental leave

Retirement plans

Relocation support

Wellness programs

Meal and transportation allowances

Other location-specific perks

Job summary

Mistral AI is seeking Applied Scientists to build frontier cybersecurity models. You will develop SOTA models across cybersecurity domains, building environments, training-data pipelines, and evaluations that are measurable and trustworthy for security applications.

You’ll work with researchers, engineers, and product teams to deliver high-impact AI for security, with opportunities to contribute to large-scale codebases and open problems in the field.

Qualifications

• Fluent in English with excellent communication skills.
• Experience building harnesses, benchmarks or RL environments for code, agentic or security tasks.
• Hands-on security background in vulnerability research, exploit development, red teaming, or detection and incident response.
• Writes clean, readable Python code.
• Ability to work independently with minimal guidance.
• Comfort navigating large codebases.
• Low-ego, collaborative and eager to learn.
• Track record of success through projects or academia.

Responsibilities

• Develop, pre-train and post-train domain-specialized foundation models for agentic defensive security.
• Work across a diverse set of complex real world problems to build the future of AI for cybersecurity.
• Design evaluations and benchmarks that measure realistic security capability on customer-representative tasks.
• Build sandboxed execution environments, RL tasks, and verifiers grounded in real customer workflows, and generate training data for frontier models.
• Develop tools and frameworks to facilitate data generation, model training, evaluation and deployment.
• Own technical delivery across project sprints and manage research communications with customer teams.

Skills

English fluency

Python programming

Codebase navigation

Independent worker

Collaborative mindset

Strong communication

Track record of success

Education

PhD / Master in Mathematics, Security, or ML

Tools

RL environments

Benchmark harnesses

Job description

Mistral AI is seeking Applied Scientists to build frontier cybersecurity models. You will develop SOTA models across cybersecurity domains, building environments, training-data pipelines, and evaluations that are measurable and trustworthy for security applications.

You’ll work with researchers, engineers, and product teams to deliver high-impact AI for security, with opportunities to contribute to large-scale codebases and open problems in the field.