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Mistral AI is seeking an experienced software engineer to join its Defense team, building software solutions for defense institutions and industry partners. The company provides full-stack AI solutions spanning frontier models, developer tools, applications, and compute infrastructure, serving high-stakes sectors including finance, manufacturing, defense, healthcare, and the public sector.
In this role, you will operate as a senior technical individual contributor with substantial scope and autonomy within a small, focused team. You will design and build core services for data ingestion, transformation, storage, querying, and operational workflows. Your responsibilities include developing shared data models, APIs, and SDKs that provide a consistent foundation for application development; architecting authorization and access control as a core system concern with clear audit trails; solving complex problems around data consistency, schema evolution, concurrency, performance, and failure recovery; translating requirements from applied engineers and defense users into reusable, pragmatic software capabilities; and owning delivery end-to-end from implementation through testing, observability, debugging, and operation in demanding deployment environments.
A key aspect of this role is extensive use of AI coding tools and agentic engineering workflows to accelerate implementation, testing, refactoring, and debugging while maintaining accountability for architecture, correctness, security, and maintainability.
Mistral's teams are distributed across Europe, North America, Asia, and the Middle East. The company emphasizes a collaborative, low-ego culture with a focus on innovation and solving hard problems in high-stakes industries.
REQUIREMENTS:
- Strong practical familiarity with AI coding tools and agentic engineering workflows; regular use of coding agents with ability to scope tasks, provide context, review generated code, and validate through testing and debugging
- Proven track record building and operating production software with substantial ownership of complex systems
- Experience in data engineering or building transactional, analytical, or distributed systems; understanding of data model trade-offs, storage, query execution, and service boundaries
- Experience building products where access control, permissions, and data governance are central (e.g., Palantir Foundry or comparable systems)
- Broad software engineering skills with ability to move between architecture, implementation, and production debugging across unfamiliar codebases
- Strong proficiency in Python or another programming language; solid SQL skills; ability to become productive quickly in Python and TypeScript environments
- High autonomy and sound judgment; ability to turn ambiguous problems into concrete plans, make technical decisions, and deliver useful increments with limited supervision
- Collaborative approach to technical leadership through code, design discussions, code reviews, and mentoring; clear motivation to build software for defense institutions and industry
NICE TO HAVE:
- Experience building data platforms or developer products used by other engineering teams
- Experience with fine-grained authorization, multi-tenant architectures, data lineage, or auditable operational workflows
- Experience with self-hosted software, restricted networks, or other demanding deployment constraints
- Familiarity with LLM applications and their integration with data and tools
