Data Center Hardware Engineer

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. You will work every day on the racks that power one of France's largest AI clusters. Mistral's compute footprint is our single largest investment and the foundation of our AI research and engineering. We're hiring Data Center Hardware Engineers to keep our GPU/CPU clusters healthy, safe and growing — hands-on, in the data center, at the intersection of high-performance computing and physical infrastructure. You'll join a small, senior team working at a scale few engineers get to experience: GPU-dense racks (H100/H200-class and next-generation platforms), high-speed interconnects, liquid-cooled systems — with new sites under development in France and beyond. Hardware here is not someone else's problem. As part of a small on-site team, you carry responsibility for it end to end.

Responsibilities

Diagnose & repair server and cluster hardware: CPUs, memory, drives, NICs, GPUs, PSUs, and interconnect problems (switches, cables, transceivers, Ethernet/InfiniBand); Intervene safely — power-off/lockout, ESD discipline, pre/post-work checklists, tidy and safe work areas; Capture everything — photos, serials, test results; open, update and close tickets with notes the next engineer can act on; Manage parts — receive, label and track inventory; run RMAs and coordinate with vendors; Help us get better — feed recurring anomalies into monitoring, alerts and SOPs; contribute small scripts (Python/Bash) if you have those skills; Be a good teammate — clear status updates, honest handovers, and respect for the people depending on the cluster

Requirements

Hands-on comfort in data centers or server hardware — you can (or will quickly learn to) work cleanly in racks: rails, cabling, labeling, mounting; Disciplined and meticulous: checklists aren't bureaucracy to you, they're craftsmanship; Practical electrical basics: power-off procedures, PPE, short-circuit risk awareness; Basic Linux (boot checks, logs); Physically able to work in racks (lift, mount, maneuver) in a data center environment; Comfortable in a 24/7 operation, including a rotating on-call with emergency response expectations; Driver's licence (B) for travel between our sites

Nice to have

HPC/AI/cloud production experience at scale; large-fleet server install and maintenance; Networking fundamentals (Ethernet/InfiniBand) beyond basics; Vendor/RMA tooling, ticketing (Jira/ServiceNow), inventory systems; Python/Bash automation for checks, capture, inventory or reporting; Scripting (Python/Bash) is a plus

Benefits

Healthcare coverage; Parental leave; Retirement plans; Relocation support; Wellness programs; Meal and transportation allowances; Other location-specific perks