Backend Software Engineer

Requirements

• We welcome engineers at all levels from fresh graduates to senior and staff engineers and who are eager to learn, collaborate and ship impactful products
• Degree in Computer Science, Software Engineering, or equivalent practical experience
• Proficiency in Python or another backend language (Java

  Script/Type

  Script, C#, Golang). Engineers are assessed in their preferred language during a live coding session
• Strong understanding of backend fundamentals: APIs, databases, caching, messaging systems and distributed architectures
• Strong problem‑solving abilities and attention to detail
• Ownership mindset capable of shipping end-to-end features with minimal oversight
• Excellent communication skills and collaborative attitude
• Team-oriented, low-ego mindset and curiosity for learning
• (Desirable) Front‑end development (TypeScript, React, Next.js...) or full-stack exposure
• (Desirable) Infrastructure management (Docker, CI/CD, Kubernetes, Helm, Terraform...)
• (Desirable) AI/ML engineering
• (Desirable) Observability and monitoring tools (Prometheus, Grafana, Datadog…)
• (Desirable) UX and product-centric mindset
• We're driven to build a strong company culture and are looking for individuals with solid alignment with the following:
• Reason with rigor
• Are you audacious enough?
• Make our customers succeed
• Ship early and accelerate
• Leave your ego aside

What the job involves

• As a Backend Engineer, you’ll contribute to the development of the core systems powering our three main products, AI Studio, Le Chat & Mistral Code, shaping how users and developers interact with our AI platform at scale
• 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
• Depending on your skills and field of expertise, you will be involved in key components of our technology, including:
• Design, develop and maintain scalable, robust backend features and APIs using modern frameworks
• Ensure high performance and reliability across our distributed systems
• Contribute to systems powering authentication, billing, AI tooling, observability, connectors, and developer experience
• Design and implement efficient, secure and scalable architectures that support our fast-growing products
• Collaborate with infrastructure teams on deployment, monitoring, and performance optimization
• Write clean, maintainable and well-documented code
• Participate in code reviews and contribute to technical standards and best practices
• Work closely with product managers, front-end engineers, designers and data/AI engineers to deliver end-to-end features
• Partner with teams across AI Studio, Le Chat & Mistral Code to ensure consistent platform-wide experience
• Tackle complex engineering challenges, from distributed systems to AI product integration
• Stay up-to-date with new technologies (e.g., AI/LLM integration, observability, or backend frameworks) and bring them into production when relevant