CNC Machinist

CNC MachinistThis role focuses on fabricating high-precision components, fixtures, and prototypes that support both experimental and production systems. As a CNC Machinist, you take full ownership of the parts you produce, ensuring quality, surface finish, and on-time delivery from initial drawing to final handoff. You collaborate closely with mechanical engineering and physics teams to convert complex CAD models into manufacturable parts, often working at the limits of tolerance, finish, and material performance to support advanced hardware and cutting-edge manufacturing.ResponsibilitiesFabricate precision components, fixtures, and prototypes using manual and CNC equipment, including mills, lathes, and multi-axis machines.Own the full lifecycle of each part from drawing to delivery, including setup, machining, inspection, and final handoff.Translate complex CAD models into manufacturable parts by applying sound machining strategies and best practices.Program and optimize CAM toolpaths using software such as Mastercam, Fusion 360 CAM, NX CAM, or similar tools.Develop and implement fixturing strategies to ensure repeatability, accuracy, and efficiency in machining operations.Machine a wide range of materials, including aluminum, stainless steels, copper, titanium, and exotic alloys, while maintaining tight tolerances.Achieve ultra-precision tolerances, including sub-thousandth-level accuracy, and maintain high-quality surface finishes.Interpret mechanical drawings and apply GD&T principles to ensure parts meet all dimensional and geometric requirements.Perform detailed inspection and metrology using calipers, micrometers, height gauges, indicators, and CMM equipment.Document and own quality for each part, identifying nonconformances and driving corrective actions as needed.Maintain a clean, organized, and safe shop environment, including proper care and maintenance of tools and machines.Collaborate closely with engineering teams to flag manufacturability issues early and recommend design improvements.Apply vacuum-clean machining practices for parts destined for ultra-high vacuum (UHV) applications when required.Support specialty machining processes such as EDM, surface grinding, lapping, welding, jig boring, or 5-axis programming, as applicable.Contribute to a R&D environment by adapting quickly to changing priorities and new technical challenges.Essential SkillsTrade school certification, apprenticeship, military machinist training, or equivalent hands-on machining experience.5+ years of experience machining precision parts to sub-thousandth tolerances on manual and CNC equipment, including mills, lathes, and multi-axis machines.Hands-on CAM experience with software such as Mastercam, Fusion 360 CAM, NX CAM, or similar tools, including toolpath optimization and fixturing strategy.Proven ability to machine a wide range of materials, including aluminum, stainless steels, copper, titanium, and exotic alloys.Strong proficiency in reading mechanical drawings and interpreting GD&T.Advanced inspection and metrology skills using calipers, micrometers, height gauges, indicators, and CMM.Demonstrated ability to deliver ultra-precision CNC machining work with tight tolerances and high-quality finishes.Clean, organized shop habits with strong attention to safety and proper tool and machine care.Excellent communication skills and the ability to collaborate effectively with engineering teams.Experience operating CNC mills, CNC lathes, and other CNC machines in a production or R&D environment.Additional Skills & QualificationsExperience working in startup or R&D environments.Familiarity with vacuum-clean machining practices for UHV-bound parts.Experience with cleanroom-compatible part preparation.Exposure to specialty processes such as EDM (wire or sinker), surface grinding, lapping, welding, jig boring, or 5-axis programming.Experience in machining for semiconductor equipment, accelerator hardware, or aerospace components.Strong sense of quality ownership and accountability for the parts produced.Ability to collaborate closely with cross-functional teams and contribute to design-for-manufacturability discussions.Why Work Here?The organization offers a compelling combination of benefits, support, and long-term upside. Team members receive comprehensive medical, dental, and vision coverage with generous premium support, helping to ensure peace of mind and well-being. A monthly housing subsidy is available for those living within an approved distance of the facility, easing the cost of living in the area. Relocation support is provided for individuals moving to San Francisco, making transitions smoother and more accessible. In addition to competitive cash compensation, a generous equity package allows employees to share in the long-term success and growth of the company. The culture emphasizes innovation, ownership, and collaboration in a highly technical environment, giving you the opportunity to work on frontier technologies with a team that values craftsmanship and continuous improvement.Work EnvironmentThe role is based in a stealth startup machine lab environment focused on advanced R&D and precision manufacturing. You work hands-on in a modern machine shop equipped with CNC mills, CNC lathes, drill presses, and precision metrology tools, including CMM and other inspection equipment. The setting emphasizes ultra-precision CNC machining, tight tolerances, and high-quality finishes on a wide range of materials, including aluminum, stainless steel, copper, titanium, and exotic alloys. You collaborate closely with engineering and physics teams, often working on frontier hardware and experimental systems. High delivery dynamic, typical of a startup and R&D-focused organization, with an emphasis on safety, cleanliness, and organized shop practices. Dress is practical and suitable for a machine lab environment, with appropriate safety gear and shop attire expected while working on equipment.Job Type & LocationThis is a Permanent position based out of San Francisco, CA.Pay and BenefitsThe pay range for this position is $100000.00 - $170000.00/yr. Individual compensation offered for this position within this range will depend on many factors, including qualifications, skills, relevant experience, job knowledge, geographic location, internal equity, and other pertinent job-related factors.1.5k a month housing bonus if live or move close to San FranciscoWorkplace TypeThis is a fully onsite position in San Francisco, CA.Application DeadlineThis position is anticipated to close on Sep 15, 2026.