Mistral
Model Behavior Architect- General Agents
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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.
At Mistral AI, we believe in the power of AI to simplify tasks, save time, and enhance learning and creativity. Our technology is designed to integrate seamlessly into daily working life.
We democratize AI through high-performance, optimized, open-source, and cutting-edge models, products, and solutions. Our comprehensive AI platform is designed to meet enterprise as well as personal needs. Our offerings include Le Chat, La Plateforme, Mistral Code, and Mistral Compute—a suite that brings frontier intelligence to end-users.
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 France, USA, UK, Germany, and Singapore. We are creative, low-ego, and team-spirited.
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Join us to be part of a pioneering company shaping the future of AI. Together, we can make a meaningful impact. See more about our culture on https://mistral.ai/careers.
About the role
As a Model Behavior Architect on the Function Calling team, you are at the forefront of defining and measuring how LLMs use tools, invoke functions, and orchestrate complex agentic workflows.
We are looking for people who have built a career in engineering, machine learning, and large language models and are experts in model evaluation, policy writing, and creating eval pipelines for tool use and function calling. Your role is to work hand-in-hand with our Science team to define what 'good' looks like for function calling—from accurate parameter selection and schema adherence to multi-step tool orchestration, error recovery, and agentic reasoning.
Join us if you are passionate about tackling cutting-edge, open-ended research challenges and transforming your insights into best-in-class models.
What you will do
- Interact with models to identify where function calling and tool use behavior can be improved
- Gather internal and external feedback on tool-calling behavior to scope areas for improvement
- Design and implement evals, data guidelines, data generation, and synthetic tool environments and APIs
- Identify and fix edge case behaviors, such as malformed arguments, hallucinated functions, and incorrect tool selection—through rigorous testing
- Develop robust evaluation pipelines for the function-calling capabilities of our model candidates
- Work collaboratively with AI Scientists
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About you
- You have a deep understanding of either 1) API design, structured outputs, and schema specification (e.g. JSON Schema), 2) engineering and code behavior, 3) LLM agents at work, including reasoning, planning, and multi-step tool use
- You have prior knowledge in training and optimizing model behavior
- You are an expert at building robust evaluations
- You thrive in dynamic and technically complex environments
- You have a track record of delivering innovative, out-of-the-box solutions to address real-world constraints
What we offer
- 💰 Competitive salary and equity (stock-options)
- 🧑⚕️ Health insurance
- 🚴 Transportation allowance
- 🥎 Sport allowance
- 🥕 Meal vouchers
- 🍼 Generous parental leave policy
- 🌎 Visa sponsorship
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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.
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