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 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.