Type One Energy Group is mission-driven to provide sustainable, affordable fusion power to the world. Established in 2019 and venture-backed in 2023, the company is led by a team of globally recognized fusion scientists with a strong track record of building state-of-the-art stellarator fusion machines, together with veteran business leaders experienced in scaling companies and commercializing energy technologies Type One Energy is seeking an experienced Senior Mechanical Engineer to join our Plasma Fueling Team. This role is ideal for an Engineer with strong system design experience who is motivated to grow into technical ownership of key projects. The successful candidate will contribute to the design, development, and testing of complex mechanical systems operating in ultra-high vacuum (UHV), cryogenic, and hydrogen environments, while advancing the technology readiness level (TRL) of critical plasma fueling components. This role requires close collaboration with plasma physicists, engineers, safety specialists, and external suppliers.