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At Electrogenos, we’re building technology to make green hydrogen competitive at scale. We focus on reducing the cost and complexity of hydrogen production so it can replace fossil-based alternatives across real-world applications. We’re an early-stage team working at the intersection of electrochemistry, manufacturing, and deployment. We are looking for an engineer with a few years of established experience to own the thermal, fluid, and pressure aspects of our alkaline electrolyser stack and balance-of-plant systems. We are developing enclosed multi-cell modular stack architectures with strong parallels to modern chlor-alkali cell design. As we scale from kW to MW-class systems, we need someone who understands electrolyte circulation, gas-liquid separation, thermal management at 80–100°C, and pressure balancing between hydrogen and oxygen sides. This is a hands-on as much as analytical role. You will model and simulate, but you will also be on the shop floor commissioning what you designed, troubleshooting what didn’t work, and iterating in real time. We need someone equally comfortable with a process simulation and a pipe wrench. We are not looking for another team leader — we need someone who wants to get their hands dirty and go deep on the engineering. Direct experience with alkaline water electrolysers or chlor-alkali cell technology is strongly preferred. However, if you bring deep thermal engineering and process design experience from a related field and can demonstrate strong thermofluid fundamentals, we want to hear from you. As we move toward our first pilot deployments — including at international partner sites — you should be comfortable travelling and supporting commissioning beyond the Milton Park workshop. Visa sponsorship is available for the right candidate. Own thermofluid design of multi-cell alkaline electrolyser stacks: flow distribution, gas management, thermal behaviour Design and optimise electrolyte circulation for uniform distribution across cells in enclosed modular configurations Develop thermal management strategies for operation at 80–100°C Model and validate pressure balancing between O₂ and H₂ sides, including differential pressure control and its safety implications Design BOP from P&ID through to component specification: pumps, heat exchangers, separators, valves, piping Perform mass and energy balances across operating conditions Specify materials for hot KOH service Commission, test, and troubleshoot the systems you design — hands-on on the shop floor Contribute to HAZOPs and pressure system compliance (PED, PSSR) Analyse test data and feed insights back into design iterations Support the coordination and commissioning of pilot deployments at partner sites, including internationally Degree in Mechanical, Chemical, Process, or Thermal Engineering Approximately 3 to 6 years of relevant experience Strong thermofluid engineering fundamentals: heat transfer, fluid mechanics, two-phase flow, thermal system design Experience with process design: P&ID development, mass and energy balances, component specification Understanding of gas-liquid separation and thermal management in process systems Knowledge of materials selection for aggressive chemical environments Hands-on and rig-competent: comfortable commissioning, plumbing, and troubleshooting the hardware you design Comfortable working with pressurised systems Direct experience with alkaline water electrolysers or chlor-alkali cell technology (strongly preferred) Experience with multi-cell, bipolar, or enclosed cell stack configurations Thermal engineering experience: heat exchanger design and selection, thermal transient analysis, cooling system design Process engineering experience in chemical, petrochemical, or energy sectors Experience with enclosed or zero-gap cell designs Process simulation or CFD experience (ANSYS, COMSOL, Aspen, or similar) PED, PSSR, or EN 13445 compliance Hydr