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London / Hybrid IONATE is a deep tech scale-up building the hardware and software backbone for smart grids. Our mission is to transform power systems - from grids and microgrids to renewables and data centres - unlocking the massive potential in this under-innovated sector that touches every aspect of our modern lives. Our team is looking for a Mechanical Design Engineer who will be responsible for developing next-generation mechanical systems from concept to series production. Requiring previous hands-on experience in mechanical design, test and manufacturing, this position will involve working across our hardware team, focusing on inverter design and thermal cooling systems with a high degree of electro-mechanical integration. You will need an innovative approach to engineering with well-grounded reasoning and drive for continuous improvement. Importantly you will contribute to live ongoing projects and work with the team to continue developing our HIT technology. What you will do: Work in close tandem with power electronics and electrical engineers to design next-generation mechanical assemblies for inverters, switchgear, control, and protection equipment. Design and develop cabinet enclosures, electro-mechanical interfaces, and custom components, working closely with manufacturing partners and designers. Architect, build and test air-to-air and liquid-to-air cooling systems for high-power components and power modules. Use our well-equipped workshop to build and test new prototype concepts. Participate in hands-on design validation and testing in the lab/workshop and field environments as part of our multi-disciplinary team. Be responsible for hardware and component selection, working alongside procurement specialists to maintain BOMs and manage supply chain risks. Create and maintain documentation including requirements documents, testing reports, data packs for manufacturing and installation manuals.