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
Role summary
We are seeking hands‑on Pentesters to join our Offensive Security team. You will be running our maturing offensive solution on real client engagements while also hunting for vulnerabilities in Mistral's own systems and in the wild. This is a unique opportunity to break real client systems, discover 0‑days for fun, and help build the AI that automates offensive security at scale.
Your work will directly impact both our clients' security posture and Mistral's own defensive capabilities. You'll be at the forefront of our offensive security practice, with the chance to shape how AI transforms penetration testing. We welcome offensive security experts at all levels who are passionate about breaking systems and building the tools that make security testing more effective.
Client Engagements
- Run our offensive security solution on real client engagements: scoping, executing tooling, and delivering results
- Triaging output and killing false positives to ensure high‑quality, actionable findings for clients
- Advise clients through deployment and remediation, acting as a trusted security partner
- Travel to client premises and switch between engagements in a classic pentest consulting cadence
Internal Dogfooding
- Pentest Mistral's own systems, finding vulnerabilities before our offensive solution matures
- Hunt for vulnerabilities internally and on open‑source/in‑the‑wild targets between client engagements
- Transfer knowledge and findings to the forming internal security team
- Act as Mistral's own first customer for our cyber harnesses
Guiding the Harness
- Use real offensive expertise to steer the cyber harness: identify vulnerabilities it should catch
- Validate and triage the harness's output, ensuring it meets the high standards of human pentesters
- Benchmark human vs. agent performance, helping to close the gap between automated and manual testing
- Contribute to the development of AI‑powered offensive security capabilities
About you
- Current P0 specialty: web / AppSec + source‑code review; also high‑value: internal / Active Directory, cloud (AWS/GCP/Azure), CI/CD & supply chain
- Senior enough to run an engagement solo from scoping to delivery
- Uses AI in your workflow with a nuanced view of its capabilities and limitations
- Comfortable being client‑facing, mobile, and switching between different engagements
- Proven track record of delivering high‑quality penetration testing results
- Strong problem‑solving abilities and attention to detail in vulnerability identification
Ideal additional qualifications
- Build your own offensive tooling (builder mindset that scales your impact)
- Published CVEs / GHSAs or a strong bug‑bounty track record
- Conference talks, CTF achievements, or other public recognition in the security community
- Strong code review skills for multiple programming languagesExperience with AI/ML systems and their unique security challenges
- Contributions to open‑source security tools or research
Location & Remote
This role is open to remote in Europe. Ideally you would be based in one of our European offices (Paris, France and London, UK). We strongly believe in the value of in‑person collaboration and we encourage going to the office as much as we can (at least 3 days per month) to create bonds and smooth communication. Our remote policy aims to provide flexibility, improve work‑life balance and increase productivity.
What we offer
- Competitive salary and equity (stock‑options)
- Health insurance
- Transportation allowance
- Sport allowance
- Meal vouchers
- Private pension plan
- Generous parental leave policy
- Visa sponsorship
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StudySmarter Expert Advice🤫
We think this is how you could land Pentester, Offensive Forward Deployment Engineer in London
✨Get Involved in the Cybersecurity Community
Diving into the cybersecurity community is key for landing that full-time gig. Join forums like Reddit's r/cybersecurity or attend local meetups to connect with industry veterans and other job seekers. Networking is everything in this field—don’t just be a passive lurker!
✨Show Off Your Skills with Capture the Flag Competitions
Participate in Capture the Flag (CTF) competitions; these are not just a fun way to boost your skills but also a chance to showcase your talent to potential employers. Many companies, including Mistral AI, love seeing candidates who actively engage in these challenges.
✨Tailor Your Online Presence
Make sure your LinkedIn and any professional profiles reflect your cybersecurity expertise. Share your projects, whether they’re personal or from a previous role, to catch the eye of hiring managers. This is how they’ll find your passion and commitment to the field!
✨Apply Directly Through Mistral AI
Don’t forget to head straight to our website and check out any openings for cybersecurity roles at Mistral AI. Applying directly can sometimes give you an edge, especially if you can mention that you've been following our work or engaging in the community.
Some tips for your application 🫡
Show off your technical skills:In cybersecurity, it's crucial to highlight your technical prowess. Make sure your CV showcases specific skills like network security, penetration testing, or threat analysis. If you have relevant certifications (like CEH or CISSP), pop those on the front page to grab attention!
Tailor your portfolio for the role:Even for a full-time role, a portfolio can set you apart. If you've worked on any cybersecurity projects—be it CTF challenges, security assessments, or research papers—include these in your application. This demonstrates not just your skills, but also your hands-on experience!
Use real-world examples:When writing your cover letter, don’t just stick to your qualifications. Share real-world examples of how you’ve tackled security issues or vulnerabilities. This gives the hiring team at Mistral AI insight into your practical problem-solving abilities and makes your application memorable.
Demonstrate your passion for cybersecurity:Cybersecurity is an ever-evolving field, so show us that you’re always learning! Mention any recent courses, webinars, or industry events you’ve attended. This not only exhibits your enthusiasm but also signals to Mistral AI that you’re committed to staying ahead in the game.
How to prepare for a job interview at Mistral AI
✨Sharpen Your Technical Skills
For a role in cybersecurity, it’s essential to be up-to-date with the latest tools and techniques. Brush up on your knowledge of firewalls, intrusion detection systems, and vulnerability assessment tools. Be ready to discuss specific scenarios where you’ve applied these skills, as hands-on experience can really set us apart in interviews.
✨Prepare for Scenario-Based Questions
Expect the interviewers at Mistral AI to throw in some hypothetical situations to see how you’d handle them. Think about common security breaches or incidents and be prepared to explain how you would respond. This not only shows your problem-solving skills but also your understanding of real-world cybersecurity challenges.
✨Highlight Your Certifications
Certifications like CompTIA Security+, CISSP, or CEH can give you a significant edge in a full-time role in cybersecurity. Make sure to mention these during your interview and be prepared to discuss what you learned through those certifications and how they relate to the position at Mistral AI.
✨Show Your Passion for Cybersecurity
Since you’re going for a full-time gig, showing genuine enthusiasm for the field can make all the difference. Share any personal projects, blogs, or communities you’re part of that relate to cybersecurity. This not only showcases your passion but also your commitment to staying engaged in this ever-evolving field.
