The Opportunity:

As the heartbeat of our workplace, the Office Administrator plays a pivotal role in creating a seamless, welcoming, and high-performing environment for our team and visitors alike. This is more than just a facilities role, it's about shaping the everyday experience of our people. From overseeing essential services and managing trusted suppliers, to resolving IT support issues and ensuring our space runs smoothly, you'll be the go-to person who keeps everything connected and functioning with care and precision. 

You'll champion a workspace that's not only operationally excellent but also energising and inclusive, supporting team events, onboarding new joiners, and making every guest feel like a VIP. If you're a natural organiser with a proactive mindset and a passion for making things better, this is your opportunity to make a real impact at the heart of our organisation. 

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

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What you’ll do: 

💼 Office & Facilities Administration

• Oversee day-to-day facility operations, including maintenance, utilities, and resolving property-related issues (e.g. leaks, Wi-Fi, AV systems).
• Manage building security, including fire alarm tests, access cards, and alarm systems.
• Coordinate with key service providers (e.g. cleaners, PAT testing, window cleaners) and suppliers, handling sourcing, contracts, and quality control.

👥 People & Culture

• Provide a warm and professional welcome to guests, maintaining a presentable reception area and coordinating refreshments for special visits.
• Play a key role in HR support, assisting with onboarding, scheduling, practical setup, and organizing team events and away days.
• Set and manage principles for facility use, including hot desk etiquette, team day planning, car charging, and cleanliness standards.

📊 Admin & Coordination

• Support staff admin, including managing the holiday calendar, organizing travel and accommodation, and maintaining up-to-date emergency contact info.
• Act as the main point of contact for our external IT support provider, ensuring timely and effective tech issue resolution.
• Being a trusted go-to for key action items such as co-ordinating complex travel and logistics activities

Ideally, you will:

• Proven experience in office, operations or facilities management, including oversight of building services, suppliers, and workspace operations.
• Strong organisational and problem-solving skills, being able to manage multiple responsibilities and respond quickly to issues)
• Excellent communication and interpersonal skills.  You will be confident working with internal teams, external suppliers, and guests.
• Experience liaising with service providers and managing contracts such as cleaners, IT support, and AV services.
• Confidence with basic IT and office technology (e.g. Wi-Fi, AV systems, Microsoft Office/Google Workspace)
• Discretion and professionalism in handling sensitive staff information (e.g. emergency contacts, onboarding details)
• A proactive and hands-on approach, anticipating needs and taking ownership of improvements)
• Good understanding of basic health & safety and building security protocols

Skills that are desirable would include:

• Previous experience working with external IT support providers
• Experience managing travel and accommodation bookings for staff
• Familiarity with HR administrative processes (e.g. onboarding, holiday tracking, maintaining staff records)
• Event or team day coordination experience
• Basic understanding of lease agreements or property compliance issues (e.g. chemicals, landlord liaison)
• First aid or fire marshal certification
  

Supercritical is seeking a highly motivated, analytical, and proactive Intern to join our dynamic team and play a key role in shaping the future of green hydrogen. Joining the Operations team, you'll be immersed in the fast-paced world of a startup intent on disrupting the energy industry and enabling a net-zero future. You'll have the opportunity to dive into diverse and challenging projects, gaining invaluable experience across various engineering functions, from product design and development to testing and quality assurance.

Just as our engineers pioneer innovative solutions to complex technical challenges, you will be encouraged to bring your curiosity and fresh perspective to help turn our designs into high-quality, manufacturable products. You will contribute directly to building and improving our manufacturing capabilities, supporting activities ranging from defining requirements with suppliers and managing production schedules to solving technical issues and ensuring our prototypes meet rigorous standards. You’ll learn to ask, “How can we build this better, faster, or more reliably?”

This internship will provide you with hands-on experience in a rapidly growing company, working alongside co-founders, experienced engineers, and production specialists. In the close-knit community that only a start-up can offer, you’ll develop a broad skillset, hone your engineering and manufacturing acumen, and build an empowering understanding of how world-class manufacturing is key to the success of a cutting-edge technology company.

All applicants must submit a cover letter with their CV. Included in this cover letter you must state your preferred length of internship, 6, 9 or 12 months.

Applications will be accepted up to and including 11th August.

• Work closely with our mechanical engineers and testing teams to understand design requirements and translate these into clear specifications for suppliers.
• Obtain and compare quotes, assess proposals, and support supplier selection for critical components and assemblies.
• Manage the production and supply of new designs and prototypes, ensuring timelines and quality expectations are met so we can keep testing and iterating.
• Creatively address issues raised during design reviews, production runs, testing, or logistics, working with multiple stakeholders to find practical solutions.
• Assess the performance of manufactured components and assemblies, identifying opportunities for improvement in design or production processes.
• Play a central role in progressing and refining our designs so we can bring our product to market faster and more efficiently.
• Help maintain accurate records of builds, parts, and supplier information to support future production scaling.
• Support the preparation of materials for design and production reviews with internal and external stakeholders.
• Assist in improving internal processes and systems in the workshop and supply chain, such as organising inventory, developing build procedures, or testing the feasibility of new production techniques.
• Roll up your sleeves and get hands-on with assembly, testing, and troubleshooting. In start-ups we wear many hats, and you’ll gain exposure to a wide range of activities beyond your core tasks.

What you’ll get:

• Take ownership and accountability for tasks and projects you wouldn’t get at a large corporate.
• Gain a deep understanding of how innovative products move from design to reality, learning about all the moving parts including design iterations, supply chain management, quality control, testing, and manufacturing strategy.
• Learn about the technical and scientific aspects of our hydrogen electrolysis technology and how they impact manufacturability.
• Receive consistent feedback on performance and the opportunity to ask questions and learn directly from experienced founders and team members.

 Ideally, you will:

• Be pursuing a career in mechanical engineering, manufacturing, or production engineering.
• Have a degree or be pursuing a degree in mechanical engineering, manufacturing engineering, industrial engineering, or a related field.
• Be inherently curious and demonstrate a keen interest in how things are made and how processes can be improved.
• Be a self-starter who proactively identifies problems on the shop floor or in production processes and works to solve them.
• Be willing and capable of thinking creatively, and confident in contributing practical ideas in a wider team setting.
• Have strong analytical and problem-solving skills, especially in engineering and technical contexts.
• Possess excellent written and verbal communication skills for documenting processes and working with suppliers.
• Be highly organised and able to manage multiple tasks and deadlines simultaneously.
• Be eager to learn about the green hydrogen industry and the technical requirements of manufacturing deep-tech products.
• Be comfortable getting hands-on with tools, prototypes, and test rigs in a workshop or lab environment.
• Be able to work both independently and within a team.
  
  

Desirable:

• Knowledge of manufacturing processes, supply chain management, or production planning.
• Experience with CAD, technical drawings, or mechanical assembly.
• Familiarity with quality control, lean manufacturing principles, or design for manufacturing.
• Past demonstrable experience in a workshop, lab, or manufacturing environment.

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.