Full-time · On-site

Software Engineer, Backend

MA
Hiring company

Mistral AI

London, England, United Kingdom · Posted 13 April 2026

The role

Overview

As a Backend Engineer at Mistral AI, you will be at the epicenter of the generative AI revolution, building the foundational systems that power flagship products like Le Chat and AI Studio. Your daily work will involve architecting high-performance APIs and robust distributed systems that must remain resilient while serving millions of global users. You will not just be writing code; you will be designing the infrastructure for authentication, complex billing cycles, and developer-centric tooling that allows the world to interact with cutting-edge large language models. This is a high-impact role where your engineering decisions directly influence how accessible and efficient AI technology becomes for the next generation of creators. You will join a lean, high-velocity team that values technical rigor and a low-ego approach to problem-solving. Mistral AI is a unique environment that blends the spirit of open-source innovation with the scale of enterprise-grade solutions. The culture here is built on the principle of shipping early and iterating fast, meaning you will see your contributions move from development to production at an accelerated pace. Collaboration is deeply cross-functional, requiring you to interface with infrastructure specialists, product designers, and AI researchers to ensure a seamless end-to-end user experience across their expanding ecosystem. This position offers an unparalleled growth trajectory for engineers who want to master the intersection of backend systems and artificial intelligence. Whether you are joining as a rising talent or a seasoned staff engineer, you will be challenged to solve complex problems related to observability, system security, and scalability. As Mistral AI continues its global expansion, you will have the opportunity to define technical standards and mentor others, ultimately helping to shape the future of a company that is democratizing access to the world's most advanced AI models.

The hiring side

About Mistral AI

Mistral AI is a mid-sized employer working in artificial intelligence, based in London, England, United Kingdom.

Industry

Artificial Intelligence

Size

Medium

Location

London, England, United Kingdom

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What they need

Requirements & Skills

Key Responsibilities

  • Design and maintain robust backend features and APIs for AI Studio and Le Chat
  • Implement secure and scalable architectures to support rapid user growth
  • Collaborate with infrastructure teams on performance optimization and monitoring
  • Partner with product managers and AI engineers to deliver end-to-end features
  • Stay current with LLM trends to integrate new AI capabilities into production

Essential

  • Proven experience in backend development and API design
  • Proficiency in modern backend frameworks and programming languages
  • Experience building and maintaining scalable distributed systems
  • Ability to write clean, maintainable, and well-documented code
  • Strong collaborative skills for working with cross-functional product teams
  • Commitment to high code quality and participation in peer code reviews

Preferred

  • Experience with AI/LLM integration and tooling
  • Knowledge of observability and monitoring frameworks
  • Experience with billing systems and authentication protocols
  • Familiarity with cloud-native deployment and infrastructure optimization

Key Skills

Backend DevelopmentAPI DesignDistributed SystemsSystem ArchitectureScalabilityCode ReviewTechnical DocumentationProblem Solving

Networking

People to Know

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Perks

Benefits & perks

  • Opportunity to work at a pioneering AI company
  • Collaborative and diverse international work environment
  • Exposure to cutting-edge open-source and proprietary AI models
  • Dynamic culture focused on innovation and rapid shipping
  • Flexible distributed team structure across Europe, US, and Asia

Next step

Apply now

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