About Radiant Radiant is an El Segundo, CA-based company building the world's only mass-produced, transportable nuclear microreactors. The U.S. grid is under growing strain, with power demand accelerating, driving higher utility costs, rising carbon emissions, and interconnection backlogs. Radiant has a solution, transportable, on-site power. Our first reactor, Kaleidos, is 1 megawatt: small enough to be factory-built, transported by land, sea, or air, and deployed wherever power is needed. 1 MW can power 1000 homes for five years. Ship it back and we refuel for a 20 year operating life. We made energy a product that can be used for critical infrastructure like military bases, data centers, hospitals, and remote sites, as well as the commercial main street businesses that keep America running. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Navy and Air Force and has signed pre-order agreements with Equinix, with deployments beginning in 2028. About the Role Radiant is seeking a Staff Manufacturing Engineer to help transition Kaleidos from a first-of-a-kind reactor build into a repeatable, scalable production system. With the initial Kaleidos reactor build complete, Radiant is now applying what we learned through design, fabrication, assembly, integration, and test to the next generation of the product. This includes reducing mass and part count, improving manufacturability and assembly, increasing production repeatability, and developing the processes, tooling, equipment, suppliers, and quality controls required to manufacture reactors at scale. In this role, you will work closely with design, quality, test, supply chain, and operations engineers to influence hardware from the earliest stages of design through fabrication and final assembly. You will own manufacturing processes for critical reactor components, mechanisms, structures, and integrated assemblies, ensuring designs can be built safely, reliably, and repeatedly while meeting demanding performance and quality requirements. You will be expected to identify manufacturing constraints early, drive DFM and DFA into the product, develop and qualify production processes, and close the loop between engineering intent and what happens on the factory floor. The ideal candidate is equally comfortable reviewing a CAD model with a design engineer, developing a fixture or manufacturing process, troubleshooting a build issue, working with a supplier, and using production data to improve the next iteration of the product. This is a hands-on engineering role with significant influence over how Kaleidos evolves from a development program into a manufacturable product. Responsibilities & Duties • Own manufacturing and inspection processes for critical Kaleidos components, mechanisms, structures, and assemblies from design release through fabrication, integration, and final acceptance. • Partner closely with design engineers to drive design for manufacturability and assembly (DFM/DFA), influencing hardware to reduce mass, part count, manufacturing complexity, assembly time, and production risk. • Evaluate designs for manufacturability, inspectability, tolerance stack-up, tooling access, assembly sequence, subsystem integration, and final reactor assembly. • Develop, qualify, document, and continuously improve manufacturing processes for complex mechanical hardware and integrated assemblies. • Translate engineering drawings, CAD models, requirements, and specifications into manufacturing plans, work instructions, inspection strategies, tooling requirements, and production controls. • Define fabrication and assembly approaches for new hardware, including process selection, sequencing, make-versus-buy decisions, and inspection methodology. • Design and develop production tooling, fixtures, assembly aids, lifting equipment, and other manufacturing equipment required to safely and repeatably build reactor hardware. • Partner with Quality and Test Engineering to establish inspection and acceptance strategies, resolve build and test issues, and incorporate lessons learned into future hardware and processes. • Investigate manufacturing defects, nonconformances, and assembly issues using structured root-cause analysis and implement durable corrective actions. • Identify, evaluate, and develop suppliers for critical components and manufacturing processes, working directly with suppliers to mature fabrication methods and resolve technical issues. • Identify and implement capital equipment, machinery, and production infrastructure needed to support current builds and future production volumes. • Support hands-on build, integration, and troubleshooting activities while identifying opportunities to improve repeatability, throughput, yield, labor content, and production scalability. Required Qualifications & Skills • Bachelor’s degree in mechanical engineering, manufacturing engineering, aerospace engineering, or a related technical discipline from an accredited institution. • 8+ years of experience manufacturing complex mechanical hardware in a production, development, or high-reliability engineering environment. • Demonstrated experience partnering with design engineering to influence hardware through DFM/DFA. • Experience owning manufacturing processes from development through qualification and production implementation. • Strong understanding of mechanical fabrication and assembly processes, including machining, joining, fastening, alignment, tolerance control, and inspection. • Strong ability to interpret engineering drawings, CAD models, specifications, and Geometric Dimensioning & Tolerancing (GD&T). • Experience developing manufacturing documentation such as work instructions, process specifications, routings, and inspection plans. • Experience troubleshooting manufacturing and assembly problems, performing root-cause analysis, and implementing corrective actions. • Demonstrated ability to make practical engineering tradeof