Fluid Systems Design Engineer

Xcimer Energy leverages decades of research on Inertial Fusion Energy (IFE) combined with groundbreaking new laser architecture. Our mission is to deploy fusion power plants to meet global decarbonization goals as fast as possible. Xcimer has assembled a team of leaders in tough tech, fusion science, and manufacturing with a track record of rapid execution. Supported by leading investors, Xcimer is uniquely positioned to deliver limitless, clean, fusion power to combat climate change. Join us in powering a better world with inertial fusion!

As a Vacuum System Design Engineer, you will lead the design, development, manufacturing, and testing of high vacuum and gas delivery systems for next‑generation nuclear fusion energy technology. You will contribute across the full engineering lifecycle—including conceptual design, requirements definition, analysis, structural layout, integration, test, and operations. This role requires creative problem‑solving, rigorous engineering judgment, and innovative manufacturing approaches to enable reliable high‑pressure, high‑vacuum, and high‑purity gas delivery systems.

We are seeking an engineer who brings deep technical expertise, strong ownership, and a commitment to quality to accelerate the future of clean energy—while embodying Rigorous Urgency in all phases of execution. We are looking for our engineers to apply their technical expertise, problem solving skills, and dedication to quality to positively impact the future of energy!

• Design and integrate vacuum pumping and high purity gas delivery subsystems.
• Develop and release Plumbing & Instrumentation Diagrams (P&IDs).
• Apply strong fundamentals in thermodynamics and fluid mechanics to guide design decisions.
• Select and integrate key components including pumps, Mass Flow Controllers, pneumatic valves, regulators, fittings, custom weldments, and instrumentation.
• Author component specifications and manage suppliers through design, development, qualification, and hardware delivery.
• Collaborate cross‑functionally to ensure system compatibility and resolve integration challenges with informed, calculated risk.
• Lead and participate in component‑ and system‑level testing, including data analysis and test reporting.
• Establish and manage relationships with suppliers.
• Manage schedules, suppliers, budgets, and deliverables with disciplined project management.
• Use 3D CAD (NX preferred), FEA, and CFD tools (ANSYS, Altair preferred) for detailed design and analysis.
• Deliver fully documented designs using best drafting practices per ASME Y14.5 GD&T standards, including clear analysis and margin‑of‑safety reports.

• Education: B.S. degree in engineering (or equivalent discipline).
• Experience: 5+ years of experience engineering vacuum or gas delivery systems.
• Proven experience in vacuum system design and/or test.
• Experience in selecting pumps and instruments.
• Strong understanding of valves, pressure vessels, flex elements, fittings, and related hardware.
• Knowledge of fabrication and integration processes, including tubing/piping and machined components.
• Working knowledge of materials, coatings, and treatments.
• Hands‑on experience troubleshooting hardware.
• Must be a U.S. citizen or national, U.S. permanent resident (current Green Card holder), or lawfully admitted into the U.S. as a refugee or granted asylum.

• Experience with high‑vacuum systems and cryogenic pumps.
• Familiarity with noble and reactive gas properties.
• Experience designing valves and other fluid components.
• Background with data acquisition systems.
• Experience with orbital tube welding processes.
• Experience with abatement systems.

Equal Employment Opportunity

Xcimer Energy is proud to be an Equal Opportunity/Affirmative Action Employer and is committed to attracting, retaining, and developing a highly qualified, diverse, and dedicated work force. Xcimer Energy hires and promotes people on the basis of their qualifications, performance, and abilities. We support the establishment and maintenance of a workplace that fosters trust, equality, and teamwork, in which all employees recognize and appreciate the diversity of individual team members. We provide all qualified applicants for employment and employees with equal opportunities for hire, promotion, and other terms and conditions of employment, regardless of their race, color, religion, gender, sexual orientation, gender identity, national origin/ethnicity, age, physical or mental disability, genetic factors, military/veteran status, or any other status or characteristic protected by federal, state, and/or local law. Xcimer Energy will consider for employment qualified applicants with criminal histories in a manner consistent with applicable federal, state, and local laws. For more information on “EEO Is the Law,” please see here and here.

Benefits

Xcimer offers a comprehensive benefits package designed to support employee health, well-being, and long-term success. Benefits include medical, dental, and vision coverage; basic and supplemental life insurance; short- and long-term disability; paid parental leave for employees at the time of birth or adoption; and a 401(k) with a company match of up to 6%. Eligible employees also receive equity, allowing them to share in the company’s long-term success.

Xcimer operates under a flexible Paid Time Off (ATO) approach. Rather than a fixed number of vacation days, employees are trusted to take the time they need to rest and recharge while meeting the expectations of their role and team. In addition, employees receive paid sick time, 13 company-paid holidays, and an annual paid company shutdown. Benefits are available to regular employees, including part-time and fixed-term roles, as well as interns, with eligibility varying by benefit.