Xcimer Energy is a fusion energy company focused on commercializing laser-driven inertial confinement fusion, which it describes as the only scientifically validated form of fusion energy. The company is developing high-energy excimer laser systems designed to ignite fusion reactions using fuel derived from seawater and lithium, with the goal of delivering safe, clean, and affordable electricity that is cost-competitive with fossil fuels and renewables. Its mission centers on decarbonizing energy-intensive sectors such as artificial intelligence infrastructure, desalination, and industrial processes that require firm, always-on, carbon-free power.
Xcimer's technical approach relies on electron-beam-pumped excimer lasers combined with a pulse compression technique called Stimulated Brillouin Scattering (SBS), which compresses microsecond laser pulses to nanosecond durations without damaging optics. In 2024 the company broke ground on Phoenix, its first prototype high-energy laser system, located in Denver, Colorado, and announced the start of its operations in June 2026. Phoenix is the first electron-beam-pumped excimer laser built in the private sector in more than two decades and validates key elements of the company's low-cost laser fusion architecture.
Xcimer's longer-term target is Athena, which it describes as the world's first laser fusion power plant, expected to deliver 400 megawatts of continuous clean energy by 2035. The company has received a U.S. Department of Energy approval of its fusion power plant preconceptual design and technology roadmap milestone, and collaborates with industrial partners such as TRUMPF Laser SE. With a team of nearly 200 engineers, physicists, and business professionals, Xcimer positions itself as the most technically mature private laser fusion company.
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
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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.
Responsibilities
Develop and specify pump-down and vent procedures to meet vacuum system flow requirements.
Perform analyses and calculations to predict and optimize flow architecture functionality, including pressure drop, flow budgeting, humidification, and gas purity.
Design equipment using NX CAD
Work with vendors for custom and OTS devices and instruments.
Select instruments for gas analysis such as RGAs and FTIR
Work with the controls team on device integration.
Ensure functional integration of vacuum architectures and subsystems through analysis, documentation, and machine testing.
Manage pressure and vacuum vessel certifications, proof-tests, and compliance with code standards.
Lead design efforts for prototype systems and subsystems, including Preliminary and Final Designs.
Troubleshoot escalations and derive practical recommendations for improvements.
Collaborate with mechanical, laser, pulsed power, and optical engineering teams throughout the design and development process.
Support procurement of vacuum-related hardware for laser amplifiers and optical conditioning equipment.
Oversee and assist with assembly, shakedown, and testing of vacuum systems on laser amplifiers and ancillary equipment.
Provide operational support for vacuum systems and equipment.
Contribute to scaling designs for power-producing IFE reactors and participate in concept studies for IFE applications and beyond.
Qualifications
Education: B.S. in Mechanical, Nuclear, Aerospace Engineering, or related field.
Experience: 3+ years in mechanical engineering, with a focus on vacuum system design for complex hardware (preferred industries include semiconductor, solar, R+D, nuclear, fusion energy, lasers, defense).
Proficiency with 3D CAD software (NX preferred).
Working knowledge of high purity gas delivery components and standard equipment.
Working knowledge of Finite Element Analysis (FEA).
Experience with complex integrated system design (e.g., plasma source, gas delivery, pulsed power, lasers, opto-mechanical systems).
Strong problem-solving skills and a hands-on approach to troubleshooting and testing.
Interdisciplinary engineering experience is a plus.
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 of granted asylum
Desired
