Software Engineer, DevEx at Mistral (Paris, France)
Mistral· Paris, France·
Role details
Mistral at a glance
A French AI lab building open and frontier-grade large language models, with the full developer and enterprise stack around them.
Mistral is a French AI lab that builds open and frontier-grade large language models and sells the full stack around them: developer tooling, an agent studio, consumer and enterprise apps like Le Chat and Vibe, custom model training, and its own GPU compute. Its edge is deployment control, with open weights, EU hosting, and self-hosting for regulated and sovereign buyers.
$3B+ raised · latest: Series C · 1.7B euros · Sept 2025 · backed by ASML, Nvidia, Andreessen Horowitz, DST Global
Job description
About Mistral
Mistral provides full-stack AI solutions: from frontier models to developer tools, applications, and compute. We partner with enterprises tackling the hardest problems across high-stakes industries like finance, manufacturing, defense, healthcare, and the public sector, co-creating customized AI systems that they can run on their terms. 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 Europe, North America, Asia and the Middle East. We are creative, low-ego and team-spirited.
Role Summary
We are seeking experienced Software Engineer, Developer Experience to own and fostering a collaborative, automated, and efficient software development lifecycle. In this role, you will collaborate closely with product engineering teams to ensure consistent code health, accelerate development velocity through well-maintained CI pipelines, faster builds, and secure release processes. Your mission: empowering our software engineering team with seamless workflows while securing our production environments.
Location: Paris 🇫🇷
What you will do
As a Software Engineer, Developer Experience, your responsibilities will include (but may not be limited to):
Developer Experience
- Build, monitor, and enhance CI/CD pipelines to streamline development workflows and accelerate deployments.
- Design, operate and maintain scalable, reliable and secure multi-cloud infrastructures
- Identify areas for improvement and create innovative solutions that enable high developer velocity
Team Collaboration & Advocacy
- Standardize DevOps practices to ensure consistency across all engineering teams.
- Establish measurable KPIs for security performance, reliability, and compliance adherence.
- Partner with development and operations teams to embed security into daily workflows.
- Lead training initiatives to upskill teams on secure coding, threat modeling, and incident response.
- Champion a security-first mindset, driving cultural adoption of DevSecOps principles across the organization.
Representative projects
- Improve CI/CD and build systems
- Optimize cloud registries (Docker, Azure, GCP)
- Implement static and dynamic code analysis tool
- Implement automated vulnerability analysis
About you
- 5+ years of successful experience in a similar role (DevOps, Developer Experience, Platform Engineer, Internal tooling engineer, SRE...)
- Strong proficiency in:
- Scripting languages (Go, Python...) and software development best practices.
- Developer experience engineering: developer workflow optimization, tooling and automation for productivity, real-time developer support and escalation paths
- Site Reliability Engineering: CI/CD, containerization, orchestration, infra-as-code, monitoring, logging, alerting, observability...
- Exposure to:
- Multi-cloud infrastructures (AWS / GCP / Azure or On-Prem)
- Security Tools & Approaches: OWASP, SAST, DAST, SCA, vulnerability scanners
- Proven:
- Problem-solving and communication skills — ability to contextualizing, gauging risks and getting buy-in for high stakes and impactful solutions.
- Ownership, high agency and desire to improve things for others.
- Autonomy, self-drive and ability to work well in a fast-paced startup environment.
- Low ego and team spirit mindset.
What We Offer
We offer a comprehensive benefits package designed to support your 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. For the most up-to-date details on benefits available in your location, please refer to our Benefits page.
Privacy Policy Your privacy matters to us. You can learn more about how we handle your personal data in our Applicant Privacy Policy.
Why work at Mistral
- Culture: Flat structure, high ownership, low ego, and a "builders, not order takers" mentality. The company values audacity, speed, rigor, and customer centricity.
- Remote/Hybrid/Office: Based in Paris (15 rue des Halles); relocation support and visa sponsorship offered. Specific remote/hybrid policy not detailed, but global team suggests flexibility.
- Notable perks and benefits (from careers page):
- 20 weeks paid parental leave for all birthing parents.
- 100% employer-sponsored medical, dental, and vision coverage for employees and dependents.
- 6% 401k match (US) / 5% pension contribution (UK).
- Childcare support (reserved daycare seats or financial assistance).
- Meal allowances and transportation support.
- Fitness and wellness subsidies.
- Relocation and settling-in services.
- Financial and career planning support.
- Team composition: 900+ employees from 30+ nationalities; 50% female leaders.
- Interview process: For science, product, and engineering roles: intro conversation → 2-5 technical exercises → 1-3 interviews (hiring manager + teammates) → values conversation → reference checks.