Supercritical is looking for a Test Stand Engineer that will enhance our test team and move us towards our goals of scaling our cells and modules through improving our testing capabilities, increasing the functionality of our test stands and constantly raising the bar in our data quality and test outputs.

You will be passionate about diving into complex problems to pioneer innovative and novel solutions for our challenging operating conditions, while asking “How can we do this better?”.  You will come from a scientific or engineering discipline and will have a well-honed capability in testing, applying your capabilities to advance test development in a structured way.

You will join an exciting and fast moving company that is intent on disrupting the energy industry and enabling a net zero future.

• Optimise Supercritical’s proprietary catalyst and single cell test stand designs to improve accuracy, reliability and durability.
• Document changes and improvements to test stands in a structured way.
• Source and integrate suitable instrumentation and process equipment.
• Design bespoke test parts and assemblies.
• Manage spare and replacement parts inventory.
• Carry out preventative maintenance of test rigs to improve reliability.
• Collate regular progress reports and provide feedback on usability and serviceability.
• Test returned or faulty products and samples.
• Identify improvements and optimisations to test stands.

Ideally, you will:

• Have a degree in a science or engineering discipline.
• Have more than 2 years of industrial experience.
• Be analytical, enjoy solving problems and working with people.
• Experience of Computer Aided Design (CAD) software and producing technical drawings for manufacture, such as OnShape.
• Trained to use high pressure fittings, such as Swagelok and/or Parker.
• Experience with high pressure and high temperature fluid systems - supercritical water conditions preferable but not essential.
• Experience of designing, building, commissioning, maintaining and operating test stands.
• Have a working knowledge of risk assessments and GLP.
• Be intrigued by product development and eager to contribute.

Desirable

• Have experience in corrosion chemistry.
• Basic knowledge of data logging and hardware control.
• Basic knowledge of HAZIDs and HAZOPs.
• Have experience with testing tools such as Matlab, LabVIEW or TestStand.

Supercritical is looking for a research and development engineer that will enhance our technology team and move us towards our goals of scaling our cells and modules through advancing our core understanding of the science within our novel operating conditions. You will be passionate about diving into complex problems to pioneer innovative and novel solutions for our challenging operating conditions, while asking “How can we do this better?”. You will come from a scientific or engineering discipline and will have a well-honed capability in research, applying your capabilities to advance product development in a structured way. You will join an exciting and fast moving company that is intent on disrupting the energy industry and enabling a net zero future.

• Characterise a wide range of metal electrodes for hydrogen evolution and oxygen evolution reactions.
• Investigate methods to increase the performance and durability of electrodes.
• Investigate manufacturing and production methods of electrodes and how they affect performance.
• Investigate corrosion tolerance of materials and develop corrosion-resistant coatings.
• Assist with the design and fabrication of electrolyser cells and modules.
• Design experiments, pioneer new test protocols and standardise operating procedures.
• Procure and manage reagents, electrochemical equipment and consumables.
• Work with external research partners to create viable technical solutions.
• Deliver project outputs on time and within budget.
• Work with grant authorities and project partners on large, complex, collaborative projects.
• Report research outputs within the company. 

Ideally, you will:

• Have experience with alkaline electrolysis systems at commercial scale.
• Be passionate about a net zero environment, excited by innovation and proactive in your pursuit of it.
• Have 2+ years of industrial experience in materials science, physics, electrochemistry or similar scientific discipline.
• Hold an MSc or BSc in a relevant discipline such as chemistry, electrochemistry or materials science.
• Bring a strong materials science background, ideally with specialisation in metal alloys and multi-metal oxides.
• Perform EIS data analysis, equivalent circuit fittings and distribution of relaxation times (DRT) analysis, draw conclusions from experimental results and present them confidently.
• Be competent at analysing and disseminating results to non-scientists.
• Perform tests, analyse and present results comfortably.
• Demonstrate strong problem-solving skills.
• Have outstanding communication skills, both written and verbal.
• Be proactive and self-motivated, taking initiative to drive towards company goals.

Desirable:

• Hold a PhD in a relevant discipline such as electrochemistry or materials science.
• Have experience in corrosion chemistry.
• Density functional theory (DFT) modelling of alloys
• Experience of working with high pressure/high temperature systems.
• Have experience in start-up or scale-up environments.

Supercritical is looking for a research and development engineer that will enhance our technology team and move us towards our goals of scaling our cells and modules through advancing our core understanding of the science within our novel operating conditions.

You will be passionate about diving into complex problems to pioneer innovative and novel solutions for our challenging operating conditions, while asking “How can we do this better?”. You will come from a scientific or engineering discipline and will have a well-honed capability in research, applying your capabilities to advance product development in a structured way.

You will join an exciting and fast moving company that is intent on disrupting the energy industry and enabling a net zero future.

• Characterise a wide range of metal electrodes for hydrogen evolution and oxygen evolution reactions.
• Investigate methods to increase the performance and durability of electrodes.
• Investigate manufacturing and production methods of electrodes and how they affect performance
• Investigate corrosion tolerance of materials and develop corrosion-resistant coatings.
• Assist with the design and fabrication of electrolyser cells and modules.
• Design experiments, pioneer new test protocols and standardise operating procedures.
• Procure and manage reagents, electrochemical equipment and consumables.
• Work with external research partners to create viable technical solutions.
• Deliver project outputs on time and within budget.
• Work with grant authorities and project partners on large, complex, collaborative projects.
• Report research outputs within the company.

Ideally, you will:

• Be passionate about a net zero environment, excited by innovation and proactive in your pursuit of it.
• Have industrial experience in materials science, physics, electrochemistry or similar scientific discipline.
• Hold an MSc or BSc in a relevant discipline such as chemistry, electrochemistry or materials science.

• Bring a strong materials science background, ideally with specialisation in metal alloys and multi-metal oxides.

• Be competent at analysing and disseminating results to non-scientists.
• Perform tests, analyse and present results comfortably.
• Demonstrate strong problem solving skills.
• Have outstanding communication skills, both written and verbal.
• Be proactive and self-motivated, taking initiative to drive towards company goals.

Desirable:

• Hold a PhD in a relevant discipline such as electrochemistry or materials science.
• Have experience with alkaline electrolysis systems at commercial scale.
• Have experience in corrosion chemistry.
• Experience of working with high pressure/high temperature systems.
• Have experience in start-up or scale-up environments.

Supercritical is looking for an experienced and dynamic Senior Process Engineer to join our product development team, who will focus on bringing our proprietary reactor design and associated balance of plant through increasing scales, from demonstrator to pilot to commercial size.  You will also support our Technology team which focuses on electrolytic testing at larger and larger scales within our test environments and partner sites.  By working within our technical team and with our respected partners and subcontractors, the process engineer will pioneer the equipment configuration for safe electrolysis under supercritical water conditions.

We’re really excited about expanding and diversifying our team.  Coming from a diverse background ourselves, we do not discriminate regardless of disability, gender reassignment, marriage and civil partnership, pregnancy and maternity, race (including ethnic or national origins, colour and nationality), religion or belief (including lack of belief), sex, sexual orientation or any other characteristic.  We can’t wait to have you on board!

• Execute and lead process engineering design activities in a timely and cost-effective manner.
• Collaborate with our subcontractors and vendors to enable our goals of reaching a TRL6 at our demonstrator scale plant by 2026, and a pilot by 2027.
• Flowsheet development (PFDs), detailed calculations and mass and energy balance ownership.
• Process control and system design (P&IDs).
• Calculation development for design and sizing of equipment and instrumentation.
• Creating equipment and instrument specifications, and supporting the procurement process.
• Hazard identification and risk management.
• Own the technical delivery of engineering projects, reviewing engineering contractor design deliverables and responding to technical queries. 
• To work with Supercritical’s technology team, to support our lab-scale testing and scale-up, working to minimise hazard and risk. 
• Contribute to writing bids: both grant application and customer proposals.
• Customer-facing project development and negotiations for product integration.
• Partner and vendor liaison and negotiation.

• Be passionate about a net-zero environment, excited by innovation and proactive in its pursuit.
• Have a master's degree or above in Chemical / Process Engineering.
• Hold a senior or equivalent status as a process engineer in a relevant industry.
• Have demonstrated significant experience of working with high pressure/high-temperature systems and flammable gases.
• Be adept in process engineering design from first principles.
• Have demonstrable professional experience throughout the project development lifecycle, from feasibility and conceptual work, through FEED and EPC to delivery and operations.
• Be a proficient user of process modelling software such as Aspen, HYSYS, PRO II or Unisim.

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At Supercritical, we’re not just building cutting-edge technology—we’re shaping the future of clean energy. Working here means being part of a fast-moving, deeply collaborative team that thrives on innovation, curiosity, and impact. We operate with trust and transparency, valuing diverse perspectives that drive better solutions. Our culture is dynamic and ambitious, but also supportive—everyone has a voice, and great ideas come from everywhere. Expect to work alongside passionate experts who challenge the status quo, celebrate wins together, and push boundaries to make green hydrogen affordable and accessible. 

Supercritical is looking for a dynamic, passionate and driven Process Engineer to join our product development team. We are looking for someone to help us shape our system design to meet our target KPIs on safety, performance, efficiency and cost.

You will be passionate about diving into complex problems to pioneer innovative and novel solutions for our challenging operating conditions, while asking “How can we do this better, safely?”, with a focus on bringing our proprietary electrolyser and associated balance of plant through increasing scales, from demonstrator to pilot and commercial scales.  You will work directly with our Head of System and Senior Process Engineers to design and deploy larger scales within our test environments and partner sites.  You will also support the Technology team who focus on electrolytic testing at larger and larger scales within our test environments and partner sites.  

Whether it’s solving complex engineering problems, securing partnerships, or scaling our breakthrough technology, every role at Supercritical is mission-driven. If you’re looking for a place where your work genuinely matters, where you can grow, and where you’ll be empowered to take ownership, you’ll feel at home here.

• Execute process engineering design activities in a timely and cost-effective manner.
• Collaborate with our subcontractors and vendors to enable our goals of commercial pilot plant deployment by 2027.
• Flowsheet development (PFDs), detailed design and mass and energy balance calculations.
• Process control and system design (Cause and effect, T&As, P&IDs).
• Calculation development for design and sizing of equipment, valves and instrumentation.
• Creating equipment and instrument specifications, and supporting the procurement process.
• Hazard identification and risk management (HAZID, HAZOP and LOPA).
• Support site/plant based activities - commissioning, performance testing and troubleshooting
• To work with Supercritical’s technology team, to support our lab-scale testing and scale-up, working to minimise hazard and risk. 
• Partner and vendor liaison and negotiation.

Ideally, you’re passionate about clean energy and eager to bring innovative ideas to life in a collaborative and inclusive environment. You will:

• Be a self-starter and proactively identify problems and pursue solutions.
• Have a master's degree or above in Chemical / Process Engineering.
• Have relevant experience within the Hydrogen, Chemical, Nuclear, or related regulated industries.
• Be comfortable in process engineering design from first principles.
• Have 3 years professional experience with process design.
• Contribute to an empowering culture around safety in our team.
• Have strong communication and organisational skills, attention to detail and enjoy working in a team environment. 
• Be committed to inherent safe design and to the minimisation of risk. 

Desirable

• Knowledge of water electrolysis, hydrogen, its applications and its uses.
• Design experience in hydrogen and oxygen.
• Design experience in supercritical water.
• Have experience in process modelling software such as Aspen, HYSYS, PRO II or Unisim.
• Experience in scaling up designs.
• Chartered engineer status.
• CFD/modelling experience.