About us Hysata is on a mission to accelerate the shift from fossil fuels to green hydrogen with the world’s most efficient electrolyser. 5 kWh/kg) – a step change from incumbent technologies, which typically sit at ~75% and already ahead of International Renewable Energy Agency’s 2050 target. This leap in performance enables a radically simpler system design, slashing both energy use (opex) and system and renewables capex.

Hysata’s innovation has captured global attention, including publication in Nature Communications and support from leading strategic and financial investors such as BP, POSCO and Vestas. With over 100 team members, we’re a high-performing, purpose-driven company, proud to be 35% women, representing 20+ nationalities, and united by a shared mission to enable the decarbonisation of hard-to-abate sectors such as steel, chemical manufacturing, shipping and aviation. Having secured Australia’s largest ever cleantech Series B raise of US$111 million, Hysata is scaling rapidly to bring our technology to market.

With strong customer demand and a clear path to manufacturing at scale, we are on track to become a global leader in green hydrogen and put a major dent in global emissions.

About The Role

We are seeking a Mechanical Engineer to join the Balance of Stack team, supporting end-to-end delivery of electrolyser systems including design, procurement, fabrication, construction and commissioning of our demonstration and commercial scale electrolyser plants. This role is central to growing our in-house capability across pressure equipment, rotating equipment, piping, materials selection and fabrication. You will thrive in the fast-paced start-up world where no two days are the same.

You’ll be joining a team of smart, driven, collaborative and highly dedicated individuals who love solving engineering challenges and who are excited to be fighting the climate crisis. You’ll help translate breakthrough electrolyser technology into real-world industrial systems deployed at commercial scale.

Responsibilities

Mechanical Design: Support the mechanical design of our electrolyser packages, including designing piping, pressure equipment, and selecting rotating equipment and materials .

Requirements

for safety, reliability, efficiency and cost.

, constructability, safe operability and maintenance.

, and adequate piping and equipment support detailing; Review material and line specifications, pipework design and routing, and equipment layout; and Develop and review technical specifications and other engineering deliverables for the mechanical discipline. Procurement: Coordinate procurement activities for mechanical equipment, piping and special items. Construction and Fabrication: Establishing and maintaining pressure vessel and equipment registers; Leading P ID walkthroughs with the construction team and contractors; Planning, witnessing and signing off pressure and leak tests; Performing as-built checks and updating drawings and registers; and Managing the flange register and joint integrity records.

Commissioning: Support commissioning of new electrolyser packages.

Mechanical Engineer – Balance of Stack