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.
  

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’ll stem 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.

• Design optimisation of Supercritical’s proprietary catalyst and single cell test stand designs to improve accuracy, reliability and durability.
• Documenting changes and improvements made to the test stands, in a structured way
• Sourcing and integrating the most suitable instrumentation and process equipment
• Design of bespoke test parts and assembly.
• Managing spare and replacement parts inventory.
• Preventative maintenance of test rigs to improve stand reliability.
• Collating regular progress reports and feedback on usability and serviceability
• Testing any returned or faulty products/samples.
• Identifying improvements and optimisations that can be introduced in the test-stands.

Ideally, you will:

• Have a degree in a science or engineering discipline.
• > 2 years of industrial experience.
• Analytical, enjoy solving problems and working with people
• Experience of Computer Aided Design (CAD) software, such as Solidworks
• 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.
• Working knowledge of  risk assessments/GLP.
• Intrigued by product development and want to play your part in it.

Desirable

• Knowledge and experience of electrical design and wiring.
• Basic knowledge of data logging and hardware control.
• Basic knowledge of HAZIDs and HAZOPs.
• Experience with testing tools such as Matlab, LabVIEW, or TestStand

Join Supercritical and be part of the clean energy revolution. As the Pilot Plant Manager of our first out-of-lab pilot demonstrator plant, Teesside 1, you’ll have a key role in shaping the future of sustainable hydrogen, working with industry partners to drive real change. This is a key role with complete oversight over our Teesside 1 (TS1) pilot plant, to deliver technology milestones and performance validation testing as we progress towards customer pilot and commercial scales.

You’ll be at the forefront of an exciting, fast-growing industry, managing the modification and testing of our TS1 pilot plant to achieve the TRL6 (Technology Readiness Level 6) milestone and paving the way to commercial deployment. If you’re passionate about making a difference, enjoy working with people, and want to be part of a supportive, mission-driven team, we’d love to hear from you.

Oversight of Teesside 1 operations, modifications and maintenance activities

• Delivering modifications projects to bring TS1 from TRL5 to TRL6.
• Develop and manage project schedules, including key milestones and deliverables for contractors and internal teams to balance modifications,  testing priorities and the target of maintaining a high utilisation of the pilot plant.
• Have input to the detailed design with respect to installation and usage in the facility. 
• Take an active role in the commissioning process, especially where this involves integrating new equipment or processes into the existing plant.

Interfacing with site stakeholders and the wider Supercritical team

• Input into early stage internal modification projects to ensure constructability, operability and project plans are realistic based on TS1 operating and turnaround schedules.
• Establishing Supercritical’s operating presence in Wilton Centre as the key on-site representative.
• Act as the primary point of contact for the site facilities team, coordinating to ensure compliance with site procedures and processes, and managing requests for support from other facility-related services.
• Troubleshoot and resolve problems that may arise at the interfaces between the pilot plant, internal Supercritical team, contractors, and site facilities.
• Support customer and investor visits, ensuring TS1 and its outputs are well represented to external stakeholders

Managing projects, suppliers and trusted partners

• Manage all interfaces with 3rd party contractors, including negotiating contract  agreements, overseeing contractor performance, and ensuring compliance with safety and quality standards
• Be responsible for taking modifications from high level designs through to detailed design, procurement of components, build and commissioning, including sub-contracting project phases where required.
• Identify and assess project risks, including those related to contractor performance, and develop mitigation strategies 
• Develop and maintain strong working relationships with key contractors and site personnel.

Ideally, you will:

• Have a deep understanding of the processes, equipment, and materials involved in the pilot plant operations, including knowledge of engineering principles and process control.
• Be autonomous and communicative, delivering outcomes aligned with business that is majority not co-located. This role is based in Teesside and will be the sole full time company representative in the region.
• Foster a strong commitment to safety and ensuring that all operations are conducted in a safe manner, including developing and enforcing safety protocols, conducting safety training, and investigating accidents.
• Enjoy identifying and solving problems that arise during pilot plant operations, analysing data, troubleshooting equipment issues, and making sound decisions under pressure.
• Communicate effectively with a variety of stakeholders, including team members, senior management, and external partners. 
• Have the ability to plan, execute, and monitor pilot plant projects. This includes developing project plans, documentation, managing budgets and timelines, and coordinating resources.
• Demonstrate a commitment to continuous improvement and finding ways to optimise pilot plant operations. 

Capabilities & Skills:

• Ability to clearly communicate technical requirements and expectations to 3rd party contractors
• Excellent communication and negotiation skills to effectively manage relationships with external contractors and internal stakeholders.
• Strong coordination and collaboration skills to ensure seamless integration of contractor services with pilot plant operation
• Ability to work effectively with diverse groups of stakeholders, including technical staff, contractors, and site personnel.
• Excellent time management and prioritisation skills to effectively manage multiple tasks and competing demands, including interface management activities
• Ability to proactively identify and resolve potential issues related to contractor performance or facility-related challenge
• Proactive approach and hands-on attitude to problem solving throughout the project lifecycle.

Desirable

• Advanced negotiation skills to secure the best possible terms and pricing from vendors and ability to resolve contract disputes effectively
• Develop and negotiate contracts with 3rd party vendors, ensuring favorable terms and conditions.
• Understanding of contract law, commercial terms, and risk management principles.

Join Supercritical and be part of the clean energy revolution. As our Business Development Manager, you’ll have a key role in shaping the future of sustainable hydrogen, working with industry leaders to drive real change. This is more than just a sales role—it’s an opportunity to build relationships, create new market opportunities, and help scale a groundbreaking technology that makes green hydrogen affordable and accessible. You’ll be at the forefront of an exciting, fast-growing industry, securing partnerships and commercial agreements that will accelerate the transition to clean energy. If you’re passionate about making a difference, enjoy working with people, and want to be part of a supportive, mission-driven team, we’d love to hear from you.

Reporting directly to the Chief Product Officer and working across all areas of the business.

Partnership Development & Commercial Agreements

• Develop and formalise commercial agreements with key partners in the UK and around the globe.
• Qualify and segment customers based on project scale and commercial readiness.
• Nurture relationships with key partners to align expectations and drive collaboration.
• Providing market feedback to influence technology development

Lead Generation & Sales Pipeline

• Identify and engage potential partners and customers in the green hydrogen space.
• Qualify leads based on their willingness to pay and long-term strategic fit.
• Convert prospects into active partners through targeted engagement strategies.

Identifying and Securing Grants & Subsidies

• Seek and secure value-adding grant opportunities that will extend the business’ runway, deliver meaningful milestones and create new partnerships
• Facilitate the building of consortium partnerships to address project scopes whilst meeting business objectives

Public Relations & Marketing

• Manage press releases and secure media coverage to enhance brand visibility.
• Develop and execute marketing campaigns, promotional videos and newsletters
• Maintain and update the company website and social media presence.
• Plan and coordinate participation in key industry events
• Secure speaking engagements, interviews, and face-to-face meetings to expand the company’s reach.

Market Research & Strategic Positioning

• Identify organisations who have demonstrated a commitment to green hydrogen.
• Assess market demand and pricing strategies to ensure commercial viability.
• Gather insights on customer pain points and translate them into business opportunities.

Ideally, you will:

• Have proven business development experience in a high-growth technology sector, ideally within energy, hydrogen, cleantech, or industrial B2B markets.
• Be comfortable with high degrees of ambiguity and will use your market and technical knowledge to converge on appropriate strategies for the business
• Have a strong track record of securing partnerships, negotiating and closing commercial agreements and identifying optimal market opportunities.
• Experience working with industrial customers, project developers, or energy companies in capital-intensive markets.
• Exposure to hydrogen, electrolysis, or clean energy technologies is a plus but not mandatory.
• Have experience in grant writing or consortium building

Capabilities & Skills:

• Strategic thinking & market insight – Ability to identify, size, and develop new business opportunities in a rapidly evolving industry.
• Relationship management & negotiation – Comfortable engaging with C-level stakeholders, investors, and technical decision-makers to secure partnerships and deals.
• Technical fluency – Able to understand and communicate the value of complex energy technologies to both technical and non-technical audiences.
• Sales & commercial structuring – Capable of structuring deals, including capacity reservations, offtake agreements, and project financing considerations.
• Event & stakeholder engagement – Confident in representing Supercritical at industry events, securing speaking opportunities, and driving brand awareness.
• Entrepreneurial mindset & adaptability – Thrives in a fast-moving, scale-up environment, proactively identifying and solving challenges.

Desirable

• Experience with CRM tools like HubSpot

Supercritical is looking for an experienced process engineering professional with technical safety competence to join our Product team as a Senior Process Safety Engineer. 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?”, and build an empowering culture around safety in the team. You will bring your skills and curiosity to the team, focussing on delivering our proprietary reactor design and associated balance of plant through increasing scales, from demonstrator to pilot to commercial product. You will also support the Technology team who focus on electrolytic testing at larger and larger scales within our test environments and partner sites.  

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

• Manage the process safety lifecycle of demonstrator test rigs and customer pilots from concept, design through to operations.
• Develop and own safety deliverables (e.g. safety basis, Failure Mode and Effects Analysis (FMEA), etc.).
• Work with Supercritical’s technology team, to support our lab-scale testing and scale-up, working to minimise hazard and risk. 
• Ensure readiness for HAZOP & HAZID with external partners, and leading team workshops for hazard identification and risk management,
• Develop and own engineering deliverables across the design lifecycle (e.g. PFDs, equipment sizing, HMBs, P&IDs, Commissioning plans, SOPs, etc.).
• Deliver process engineering design activities in a timely and cost-effective manner.
• Carry out engineering calculations to support system design (e.g. PSV sizing, Safety Time calculations, ventilation rates, SIL validation, etc.).
• Collaborate with our partners, subcontractors and vendors to enable our goals of reaching pilot scale by 2026.
• Project manage the implementation of system development work packages under your accountability.
• Champion best practices in safety within the Product team, e.g. implementing  Inherently Safer Design (ISD) principles.
• Guide the implementation of zoning hazardous areas for explosive atmospheres (ATEX / DSEAR), control of hazardous substances (COSHH).

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 masters degree or above in Chemical / Process Engineering.
• Have relevant experience within the Hydrogen, Chemical, Nuclear, or related regulated industries.
• Have demonstrable professional experience in a technical safety specific role
• Have demonstrable professional experience across the project development lifecycle.
• Have experience of working with high pressure/high temperature systems and flammable gases.
• Be adept in process engineering design from first principles.
• Have experience in employing PHA techniques and Process Safety Management,
• Have knowledge of applicable safety standards in high hazard industries (e.g. ATEX)
• Be experienced in safety monitoring equipment, instrumentation, process control,
• 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.
• Chartered Engineer with a Professional Engineering Institution.
• Have knowledge of hydrogen industry standards.
• Experience of Layers Of Protection Analysis (LOPA).
• Experience of modelling tools & calculations for dispersion & explosion, e.g. PHAST, FLACS.
• Experience of design simulation tools such as Aspen Plus, Hysys or Unisim.

Supercritical is seeking an experienced and innovative Senior Electrical Engineer to join our Technology team. You will play a critical role in bringing Supercritical’s groundbreaking electrolyser technology to market by optimising its electrical architecture and designing robust, high-performance systems. 

Taking a leading authority in electrical engineering designing Supercritical’s core product, the electrolyser, you will work in a diverse and multidisciplinary team on an exciting development road to commercialisation.

We are looking for a passionate problem-solver who thrives in tackling complex challenges and has a strong commitment to safety, performance, and innovation. You will work at the forefront of the green hydrogen revolution, enabling a sustainable future by decarbonising hard-to-abate industrial sectors.

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• Design and develop Supercritical’s modular electrolyser from its existing prototype through to pilot and productionisation.
• Be the in-house design authority for the electrical architecture, leading on the electrical system design calculations and modelling electrical losses across the cell, module and system.
• Design, calculate, and model the modular electrical system to optimise for efficiency, interfacing with engineers and scientists of all discliplines in the wider design team
• Lead the scaling of the electrical design to a multi-module pilot and commercial plant from conception to execution.
• Lead electrical test and validation working closely with the technology, process, safety and mechanical teams.
• Qualify installations and commission systems. Troubleshoot  real-world challenges and diagnose the root cause of issues.
• Represent electrical discipline technical input for projects and/or proposals; including preparation, checking and/or approval of engineering documentation, specifications, BoMs and work packs for equipment and materials.
• Create and maintain system documentation such as Interface Control Documents, System Descriptions, Requirements, etc.
• Support the C&I function in scoping, identifying and deploying optimal electrical instrumentation.
• Ensure all applicable national and international codes of practice, legislation and company/client standards and procedures are complied with.
• Offer expert insight in system design reviews and in safety reviews such as HAZOPs and FMEAs.
• Manage relationships with external partners and contractors ensuring accurate and timely deliverables.
• Support future commercial engagements through stakeholder engagement, data analysis, and techno-economic modelling.

Ideally, you will:

• Be passionate about a net zero environment, excited by innovation and proactive in your pursuit of it.
• Be Degree qualified (or equivalent) in relevant electrical engineering discipline
• Have 6+ years of professional experience in electrical engineering design roles.
• Have good working knowledge of design practices and installation requirements of the discipline across a range of industries with extensive UK legislation and standards and HSE requirements
• Have experience with IEC regulations & all relevant UK standards and specifications.
• Have experience on testing, checking and commissioning of systems, wiring diagrams, working closely with the control side
• Have knowledge of LV isolations, energisation and commissioning requirements.
• Have experience in the requirements for CE marking of plant and equipment and the Low Voltage Directive and Machinery Directive.
• Be a self starter and proactively identify problems and pursue solutions.
• Have excellent communication skills.
• Have strong organisational skills, attention to detail and enjoy working in a team environment.
• Be able to manage multiple projects simultaneously without losing sight of the long term goal.

Supercritical is looking for a finance manager to play a critical role in maintaining order within our fully digital financial systems. We are looking for a detail-oriented colleague to ensure we have a solid foundation for our day-to-day purchasing, financial management, and financial reporting for our grant funding.

With this foundation in place, you will help us build robust financial operations that allow Supercritical to gain a deep understanding of its financial position within the green hydrogen market, make sound commercial decisions that support the growth of the the product and contribute to our mission of scaling green hydrogen and develop financial models and analyses to evaluate new opportunities and support strategic decision-making.

• Ensuring compliance with required accounting practices
  
  • Preparation of monthly and annual financial documents
  • Researching and complying with legal requirements as they pertain to the company's operations and financial activities
• Improving and refining financial operations of a fast-growing organisation
  
  • Producing month end, accounts reconciliations, expenses and accruals and management accounts
  • Creating, maintain and administer company budgets
  • Managing profit and loss statements and balance sheets and support cash flow reporting and tracking
  • Recording financial transactions in format for grant compliance
• Financial administration of the company
  
  • Payroll, pension and Employees travel & expense reimbursement
  • Conduct reconciliation of the company's bank accounts and credit card activities
  • Preparing purchase orders in accordance with requests for materials
  • Perform all activities related to the accounts payable function: including reviewing, coding, and administering payments
  • Preparing payments file each week for supplier goods and services
  • Preparing Quarterly VAT returns (Xero)

Ideally, you will:

• Be a competent and experienced user of Xero accounting software
• Have experience using Google Sheets and have generally strong IT skills
• Have bookkeeping or accounting qualifications (AAT/ ACA, CIMA, ACCA, or equivalent)
• Bring a broad background and track record in the accurate operation and performance of bookkeeping and basic management accounting functions
• Maintain strong team working and interpersonal skills, with the ability to be flexible and adaptable within the environment of a small team
• Be a methodical process-driven person, with passion for accuracy and excellence
• Be a proactive, self-motivated individual capable of working on their own initiative in a constantly changing and pressurised environment and fast-developing company
• Able to identify improvement opportunities, suggest improvements and action change

Supercritical is looking for a senior electrochemist that will enhance our R&D team and move us towards our goals of scaling our cells and modules through advancing our core understanding of the electrochemistry at our novel operating conditions. 

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 deposition methods of catalyst nanoparticles onto the electrode surface.
• Investigate corrosion tolerance of materials and develop corrosion-resistant coatings.
• Assist the CTO with design and fabrication of electrolyser cells and modules.
• Be responsible for designing experiments, pioneering new test protocols and standardising operating procedures.
• Procurement and management of reagents and electrochemical equipment/consumables.
• Reporting outputs of research to the CTO.

Ideally, you will:

• Be passionate about a net zero environment, excited by innovation and proactive in your pursuit of it.
• Have a PhD or significant industrial experience in electrochemistry or a related field.
• Have a strong material science background, ideally specialised with metal alloys and multi-metal oxides.
• Experience of performing cyclic voltammetry, chronoamperometry, chronopotentiometry and electrochemical impedance spectroscopy (EIS) measurements.  Competent at analysing and disseminating results to non-electrochemists.
• Perform EIS data analysis and equivalent circuit fittings and distribution of relaxation times (DRT) analysis , draw conclusions from experimental results and present them comfortably.
• Have experience with surface area analysis techniques.
• Demonstrate strong problem solving skills.
• Have outstanding communication skills, both written and speaking.
• Be proactive and self-motivated, taking initiative to drive towards company goals.

Desirable

• Multiphysics/Electrochemical modelling experience
• Corrosion chemistry experience
• Experience of working with high pressure/high temperature systems
• Density functional theory (DFT) modelling of alloys