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The Mechanical Engineer will manage fluid systems design, conduct thermal and fluids analysis, oversee assembly and testing, and collaborate with multidisciplinary teams.

Lead structural loads, dynamics, and vibration analyses for a portable nuclear microreactor. Perform FEA, modal/random vibration, shock, fatigue, and explicit dynamics simulations; define transport and handling environments; generate load cases; support test planning and correlation; document analyses for design verification and regulatory interfaces; collaborate across design, thermal, nuclear, and test teams to improve hardware reliability.

Lead design and delivery of multilayer, mixed-signal PCBs for reactor control systems. Define electrical architecture, perform schematic capture and PCB layout, ensure signal/power integrity and EMI/EMC mitigation, support board bring-up, debugging, validation, and cross-functional hardware/software integration for high-reliability deployments.

The Quality Systems Engineer will design and implement quality assurance practices, evaluate impacts on production, and manage policies for compliance in a manufacturing setting.

Build and lead Radiant's investor relations function: develop investor strategy, materials, and reporting; support financings and diligence; manage investor relationships, board materials, investor days, and investor-facing communications across institutional and VC stakeholders.

The Staff Mechanical Engineer will own the design and production of fluid systems, perform thermal and fluids analysis, and manage suppliers and schedules, ensuring system performance and integrity.

The Senior Mechanical Engineer will design and test fluid systems, perform thermal and fluids analysis, and manage project components, including supplier selection and risk analysis, for nuclear microreactors.

Own Radiant's external media presence: build reporter and podcaster relationships, secure executive bookings and feature coverage, coordinate investor amplification, prepare spokespeople, manage crisis communications, monitor competitors, and report media metrics.

Design and develop mechanisms for safety and control features in the new commercial reactor. Conduct trade studies, analyze designs, and manage integration processes.