Thermo Mechanical Engineer

You will lead the design of an advanced cooling system for a high-density AI accelerator system destined for data centre deployment. This includes developing the full cooling architecture — from Direct-to-Chip (D2C) liquid cooling through to rack-level thermal management and hybrid liquid-air solutions for host chassis. You’ll collaborate closely with mechanical engineers (internal and external), chip and board designers, and 3rd-party suppliers to define requirements, review designs, and ensure that every aspect of the system — from the cold plate up — meets performance, reliability, and manufacturability goals. We expect you to bring a mix of technical authority, practical design sense, and strong supplier management skills. You may also lead or advise on the development of a thermal test platform to validate solutions in real-world conditions.

Experience with AI accelerator or HPC hardware

Background in mechanical engineering — able to support mechanical chassis design and integration

Experience working directly with data centre operators or hyperscale infrastructure teams

Awareness of liquid handling and serviceability considerations in deployed environments

UK-based, or able to work UK hours with occasional on-site collaboration

Ownership and execution: you will have full agency to drive your work forward

Rapid iteration: we all work directly with top leadership to move from idea to hardware on ambitious timelines

Full-stack engagement: hardware, software, silicon, and modelling teams all work closely together to create a product with generational impact

Optimistic and pragmatic: we possess the will to win, and to do the hard work to get us there

Team player mentality: the mission is bigger than any of us, and we have the curiosity and technical focus to see the best idea shipped, no matter who’s it is

Founded in 2022, team of 70+ which is expanding rapidly

Modern, open offices in London and Bristol

Collaborative, problem-solving culture built on deep curiosity, entrepreneurial initiative and technical fluency

Certain roles may involve working on technologies subject to export restrictions. Applicants may be required to undergo additional eligibility checks to ensure compliance with applicable law.