Senior CNC Machinist

Xcimer Energy leverages decades of research on 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! This is a full-time, onsite role based at our headquarters in Denver, CO. The Senior CNC Machinist / Application Engineer will play a critical role in our rapid‑development manufacturing environment, supporting the creation of precision components for advanced fusion-energy systems. This role combines hands-on machining expertise with cross-functional collaboration across Design Engineering, Manufacturing Engineering, Programs, and Project Management. The ideal candidate thrives in a fast-paced startup environment, excels at problem-solving, and ensures that parts are delivered with exceptional quality and speed to internal customers.

CNC Machining & Manufacturing Execution • Program, set up, and operate multi-axis CNC equipment (mills, lathes, and specialty equipment) for complex prototype and low ‑ volume parts. • Develop, optimize, and maintain machining strategies, tool paths, feeds/speeds, and workholding for R&D components. • Perform in-process inspections using precision measurement tools and adjust processes to maintain tight tolerances. • Drive first ‑ time quality through disciplined machining practices and root ‑ cause analysis when issues arise. Application Engineering & Technical Leadership • Translate engineering models and drawings into efficient, manufacturable machining processes. • Partner closely with Design Engineering to provide DFM/DFX feedback, resolve ambiguities, and suggest enhancements. • Collaborate with Manufacturing Engineering to refine process flows, tooling strategies, and equipment capability. • Support project teams by evaluating machining feasibility, material selection impacts, and part design risks. Cross ‑ Functional Collaboration • Work directly with Project Managers and Project Leads to prioritize work, align expectations, communicate risks, and ensure timely delivery. • Serve as a technical liaison between machining operations and internal customers, enabling fast iteration cycles and clear communication. • Coordinate internal logistics, including material routing, part movement, and scheduling within the shop. Vendor & Supply Chain Coordination • Partner with internal Sourcing and Logistics teams to manage material procurement, outsourced operations, and incoming inspection. • Ensure external partners meet internal quality standards. Continuous Improvement in a Startup Environment • Contribute to the development of machining standards, shop documentation, and scalable workflows appropriate for a growing fusion startup. • Evaluate and recommend new equipment, tools, fixturing, or software to increase capability and reduce lead times. • Foster a culture of safety, innovation, and rapid learning.

• 7–10+ years of CNC machining experience with at least 3 years in prototype or R&D environments. • Strong proficiency in CAM software (e.g., Mastercam, Fusion 360, hyperMILL, NX CAM). • Deep understanding of materials used in energy systems (stainless steels, nickel alloys, refractory metals, engineered plastics, etc.). • Experience with GD&T, high ‑ precision inspection methods, and tight ‑ tolerance machining. • Proven ability to collaborate with engineering teams and communicate clearly with technical and non ‑ technical stakeholders. • Experience working in fast ‑ paced, ambiguous environments—preferably in hardware startups, aerospace, energy, or robotics. • Ability to self-direct work, manage multiple priorities, and maintain composure under time pressure.

• Background supporting complex, physics-driven systems (vacuum components, high ‑ energy systems, plasma devices, cryogenic assemblies, etc.). • Experience with manual machining, EDM, or additive manufacturing. • Familiarity with ERP/MRP/MES systems and shop-floor traceability.

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