# Mechanical Design Engineer, Plant Piping Systems at General Matter > United States · Unspecified · Software engineering · open. Source: https://alderhq.app/jobs/greenhouse%3Ageneralmatter%3A5123779008 (read 2026-11-06). ## Facts (observed) - Company: [General Matter](https://alderhq.app/companies/general-matter) - Location text: Los Angeles, CA; Los Angeles, CA - Where it can be done from (inferred): United States (evidence: "Location: Los Angeles, CA; Los Angeles, CA") - Posted: 2026-02-18 (261 days ago) - First seen by alder: 2026-11-02 · last verified: 2026-11-05 - Reposted: 0 times · edited: 1 times - Apply on the employer's site: https://job-boards.greenhouse.io/generalmatter/jobs/5123779008 ## Pay and sponsorship - Posted pay: not posted - Market band for similar posted roles (Los Angeles, n 514): p25 $120k, median $143k, p75 $163k ## Description (the employer's text) ### About the Company General Matter enriches uranium. We are designing, building, and operating the world’s lowest-cost enrichment services, here in the US. In the process, we are restoring America’s ability to produce nuclear fuel to power AI, advanced manufacturing and critical industries our country relies on to remain competitive. Fuel drives the cost of advanced reactor electricity production, and enrichment drives the cost of the fuel that advanced reactors consume. Reliable, low-cost enrichment is the catalyst for the nuclear Renaissance now under way. Our mission is to make nuclear not only the cleanest and safest source of baseload power, but also the most affordable. We believe abundant nuclear energy will lead to a post-scarcity society. We were incubated inside Founders Fund, like Anduril and Palantir before us, and are backed by over a dozen of the world's top venture capital firms. Our lean, world-class team of engineers and operators is applying a first-principles approach to solving the problem of nuclear fuel production. We are a mission-driven company with a culture of urgency, accountability, and transparency. Help us build a high-energy society by making the cleanest, safest form of baseload energy the most affordable. ### About This Role For decades, America has depended on others for the fuel that powers its reactors. General Matter is changing that, and the piping systems you design will help carry the process at the center of that effort. As a Mechanical Design Engineer for Plant Piping Systems, you’ll turn process architecture into real, buildable hardware for one of the first new large-scale enrichment facilities built in the United States in a generation. You won’t hand off a model and move on. You’ll own your systems from P&ID to installed pipe: sizing and selecting every valve, fitting, and support, proving each design with analysis, getting long-lead components through procurement on schedule, and walking the construction site to see your work go in. Your engineering decisions will directly affect how safe, reliable, and affordable this facility is, and what that facility produces affects the cost of nuclear power for the whole country. This role is for engineers who would rather build something that matters than maintain something that already exists. If you want high impact and real ownership, and you’re excited by fast-paced, intense, Skunkworks-style projects, we encourage you to apply and join our team. ### Responsibilities - Own the detailed mechanical design of plant piping and equipment systems, translating P&IDs and process architecture into fully engineered, constructible designs. - Size and select pipe, valves, fittings, and supports from first principles based on process conditions, including flow, temperature, and pressure. - Drive routing and layout decisions with process and structural partners, building configurations that are efficient, maintainable, and designed for the full life of the plant. - Perform structural and flow analysis to prove mechanical integrity and performance under real operating conditions. Don’t assume it works; show that it does. - Specify materials, wall thicknesses, and support methods that meet safety, regulatory, and operational requirements in a high-hazard nuclear environment. - Produce the detailed engineering drawings, BOMs, and procurement specifications that turn your designs into hardware. - Make component trade-offs that balance technical performance against availability and lead time, keeping the facility on schedule without compromising quality or safety. - Work closely with process engineers, structural engineers, and procurement so the systems you design integrate seamlessly with the rest of the plant. ### Basic Qualifications - Bachelor’s degree in Mechanical Engineering or a related field. - Evidence of exceptional ability (prior projects, portfolio of work, completed products, etc.). - 2+ years of experience in mechanical design for industrial plants, chemical facilities, or similar high-hazard environments. --- Data: alder (https://alderhq.app). Cite https://alderhq.app/jobs/greenhouse%3Ageneralmatter%3A5123779008 and the date you read it. Observed facts come from the employer's own listing; location reach, level, family and skills are inferences.