Stack & Thermofluidic Engineer in Oxford

Our mission at Electrogenos is to build 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 are an early-stage team working at the intersection of electrochemistry, manufacturing, and deployment.

About The Role: We are looking for a mid-level engineer 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 rig 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 go deep on the engineering. You must have direct experience with alkaline water electrolysers or chlor-alkali cell technology. Visa sponsorship is available for the right candidate.

Tasks:

• 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 H₂ and O₂ sides
• 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 rig floor
• Contribute to HAZOPs and pressure system compliance (PED, PSSR)
• Analyse test data and feed insights back into design iterations

Essential Skills:

• Degree in Mechanical, Chemical, or Process Engineering
• Approximately 3 to 6 years of relevant experience
• Direct experience with alkaline water electrolysers or chlor-alkali cell technology
• Understanding of electrolyte circulation, gas-liquid separation, and thermal management in electrochemical cell stacks
• Experience with multi-cell or bipolar cell stack configurations
• Competent in P&ID development and mass-energy balance calculations
• Knowledge of materials selection for hot caustic service
• Hands-on and rig-competent: comfortable commissioning, plumbing, and troubleshooting the hardware you design
• Comfortable working with pressurised systems

Desirable Skills:

• Experience with enclosed or zero-gap cell designs
• Process simulation or CFD experience (ANSYS, COMSOL, Aspen, or similar)
• Heat exchanger design and selection
• PED, PSSR, or EN 13445 compliance
• Hydrogen safety, DSEAR, ATEX
• PP, PVDF, or PFA piping for caustic service
• Full UK driving licence

Your profile: You’ve spent a few years working on alkaline electrolysers or chlor-alkali cells and you understand the thermofluid realities of hot caustic in multi-cell stacks. You’re as comfortable with a process model as you are tracing a flow problem on the rig floor. You want to own the domain in a company where the stack architecture is still being shaped, not execute someone else’s spec.

Why us? Own the entire thermofluid and BOP domain for a next-generation alkaline electrolyser. Shape stack architecture where design decisions still matter. Your models get validated on real hardware in the same building. Small team, high ownership, direct collaboration with the CTO. Competitive salary and benefits.

About us: Electrogenos is 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. Our approach is practical by design: use scalable materials and processes, and validate performance through close collaboration with partners. If you want to work on hard problems with real climate impact—and help take breakthrough technology from concept to deployment—join us.