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Sign up with Clera and we'll reach out the moment a role actually fits you — no more spraying applications into the void.
You will design pretraining, SFT, and RL data for engineering tasks while building agent architectures to execute complex workflows. You will also collaborate with domain experts to define evaluation criteria and benchmarks that measure genuine task competence.
The role requires deep machine learning expertise, particularly in LLM development, and hands-on experience with engineering workflows like CAD, CAE, or EDA. Candidates must be proficient in Python and comfortable working in Linux/HPC environments.
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.
Mistral is looking for AI Scientists with deep ML expertise and hands-on engineering experience to expand what our agentic tools can do across the engineering lifecycle — CAE (CFD, FEA, etc.) and EDA/Semi.
Working within the AI4Engineering Science team, your core work is building the pre and post-training data for Mistral's LLMs to reason about and execute real engineering tasks. Because Mistral trains its own frontier LLMs, the data and verifiers you design ship directly into models you can hold, a rare position, and the core of the job.
Alongside this, you'll help shape the agent architectures and harness that let these models operate reliably inside multi-step engineering workflows, not just answer isolated questions.
You'll work closely with domain experts across CAE and EDA or other domains to ground this work in how engineers actually work, and with the broader research team to translate that domain grounding into training signal and evaluation benchmarks that measure genuine task competence.
This is early-stage work, and that's the point: you'd be joining at the foundation, shaping the data, verifiers, and agent scaffolding that decide whether these systems become reliable or stay demo-grade. There's no inherited playbook, you'll help define what good looks like, and your work will set the direction the team builds on rather than extend an existing one.
What you will do
Design pretraining, SFT, and RL data for engineering tasks across CAD, CAE, and semiconductor/EDA
Define verifiers and evaluation criteria that capture what "correct" and "high-quality" actually mean for each engineering task, beyond surface-level plausibility
Design and improve agent architectures and harnesses: how models plan, call tools, recover from errors, and chain steps together across long-horizon engineering workflows
Build evaluation benchmarks and diagnostic tooling to identify where models fail on engineering tasks, and trace those failures back to gaps in data, reward design, or agent scaffolding
Collaborate with domain experts across CAE and EDA or other domains (and the science and solutions teams more broadly) to identify which engineering workflows are highest-value to target next
Contribute to Mistral's broader pre and post-training research, sharing findings and methodology across the science organization
Fluent English with excellent communication skills, able to explain technical ML and engineering concepts to both engineering and non-technical audiences
Deep, hands-on machine learning expertise, particularly LLM development
Demonstrated experience running, debugging, and validating real engineering workflows in at least one of CAD, CAE, semiconductor simulation, or EDA
You write clean, readable Python code and are comfortable in Linux/HPC environments
Self-directed, you don't need detailed roadmaps to make progress
Low-ego, collaborative, and eager to learn at the intersection of engineering and ML
Have experience building or fine-tuning agentic systems (tool use, multi-step planning, agent orchestration frameworks)
Have experience with reward modeling, RLHF/RLAIF/RLVR, or preference-based training
Have industrial or academic experience with CAE or EDA tools (e.g. SolidWorks, CATIA, Fluent, Abaqus, LS-DYNA, STAR-CCM+, Cadence/Synopsys/Siemens EDA tools)
Have contributed to a large open-source or industry codebase
Have publications in engineering and ML venues (NeurIPS, ICLR, JFM, AIAA, etc.)
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.
Your privacy matters to us. You can learn more about how we handle your personal data in our Applicant Privacy Policy.
Frontier AI. In your hands. We believe in a future where AI is abundant and accessible. We aspire to empower the world to build with—and benefit from—the most significant technology of our time. Join us: mistral.ai/careers
Offices: Paris, France 75010, FR
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