CyberSecurity Engineer, Offensive Security

About Mistral

At Mistral AI, we believe in the power of AI to simplify tasks, save time, and enhance learning and creativity. Our technology is designed to integrate seamlessly into daily working life.

We democratize AI through high-performance, optimized, open-source and cutting-edge models, products and solutions. Our comprehensive AI platform is designed to meet enterprise needs, whether on-premises or in cloud environments. Our offerings include le Chat, the AI assistant for life and work.

We are a dynamic, collaborative team passionate about AI and its potential to transform society.

Our diverse workforce thrives in competitive environments and is committed to driving innovation. Our teams are distributed between France, USA, UK, Germany and Singapore. We are creative, low-ego and team-spirited.

Join us to be part of a pioneering company shaping the future of AI. Together, we can make a meaningful impact. See more about our culture on https://mistral.ai/careers .

Role summary

At Mistral AI, we’re pushing the boundaries of what’s possible with agentic systems—building products like Mistral Studio and Mistral Vibe that redefine how users interact with AI. As a Security Researcher, you’ll play a pivotal role in safeguarding these innovations by anticipating, identifying, and mitigating risks before they materialize. This isn’t just about finding vulnerabilities; it’s about shaping the future of secure AI by embedding an attacker’s mindset into everything we build.You’ll work at the intersection of offensive security, AI safety, and product development, collaborating with cross-functional teams to harden our systems against evolving threats. Your expertise will directly influence how we design, deploy, and protect our most critical assets — ensuring our agents remain resilient, trustworthy, and ahead of adversaries.This role is ideal for those who thrive in dynamic environments, where creativity, technical depth, and a passion for security converge to solve unprecedented challenges.

What you will do

Proactively hunt for vulnerabilities in the interactions between our agentic applications, cloud infrastructure, and foundational models, with a focus on realistic, high-impact attack vectors.

Design and execute red and purple team exercises, simulating sophisticated adversarial scenarios to stress-test our defenses and refine our detection capabilities.

Partner with defensive teams to translate offensive insights into actionable improvements, from detection engineering to incident response.

Conduct in-depth penetration testing across our product suite, including AI-driven workflows, custom infrastructure, and user-facing interfaces.

Build and automate offensive tooling to scale your impact, leveraging cutting-edge techniques to stay ahead of emerging threats.

Communicate findings with clarity and conviction, ensuring technical and non-technical stakeholders unders