Software Engineer, Backend

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. The Role We are seeking passionate and skilled software engineers to join our Warsaw-based Context Engine team to build and enhance Mistral’s agent harness, enabling us to deliver production-grade knowledge processing, directly impacting how users interact with our AI platform.You’ll work on building reliable, high-performance backend systems and APIs that serve millions of users and developers. Your work will directly impact the developer and user experience, making it more engaging, efficient, and intuitive. We welcome engineers from mid - senior to staff level who are eager to learn, collaborate and ship impactful products. What You Will Do

• Design, develop, and maintain scalable backend features and APIs that power our AI platform.
• Ensure high performance and reliability across distributed systems serving millions of users.
• Build and improve systems for authentication, billing, AI tooling, and developer experience.
• Design and implement secure, scalable architectures to support our growing products.
• Collaborate with infrastructure teams on deployment, monitoring, and performance optimization.
• Write clean, maintainable, and well-documented code.
• Partner with cross-functional teams to deliver end-to-end features.
• Solve complex engineering challenges and integrate new technologies into production.

What We're Looking For

• Experience designing and building scalable backend systems and APIs.
• Strong problem-solving skills and ability to tackle complex engineering challenges.
• Experience with distributed systems and performance optimization.
• Ability to write clean, maintainable, and well-documented code.
• Experience with system architecture and secure, scalable design.
• Strong collaboration skills and ability to work with cross-functional teams.
• Experience with modern backend frameworks and technologies.
• Eagerness to learn, iterate, and deliver products.

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 .