Radiant

Overview

Radiant is an El Segundo, CA-based company building the world's only mass-produced, transportable nuclear microreactors. They are seeking a Mechanical Engineer to support the design and integration of electrical components and subsystems in a fast-paced startup environment.

Responsibilities

• Support the mechanical design and ownership of electrical components and subsystems.
• Mechanical design of electrical assemblies such as control panels, enclosures, brackets, mounts, and supports.
• Cable and wiring harness routing, retention, strain relief, bend radius compliance, and serviceability considerations.
• Packaging of sensors, actuators, connectors, and electrical hardware within constrained assemblies.
• 3D CAD modeling and 2D drawing creation using Siemens NX, including tolerance stack-ups and GD&T basics.
• Perform first-order load calculations (static, shock, vibration) to support structural design decisions.
• Conduct thermal analysis and heat-transfer assessments for electrical components, enclosures, and assemblies.
• Support selection of materials, fasteners, and finishes appropriate for electrical, thermal, and environmental requirements.
• Participate in system integration, troubleshooting, and validation activities alongside electrical and systems engineers.
• Collect and interpret technical requirements and provide clear, constructive feedback across mechanical, electrical, software, and systems disciplines.
• Perform trade studies and first-order analyses to evaluate design options and constraints.
• Generate and maintain design documentation to support Design for Manufacturing (DFM), assembly, and serviceability.
• Support subassembly design, coordinate with manufacturing, and assist with build and test schedules.

Requirements

• Bachelor’s degree in Mechanical Engineering or a closely related field from an accredited institution.
• 3+ Years of professional hands-on mechanical design experience.
• Experience using Siemens NX or similar 3D CAD tools.
• Familiarity with mechanical design of electrical assemblies, including enclosures, brackets, and harness routing principles.
• Basic understanding of structural mechanics, load paths, and first-order stress calculations.
• Knowledge of thermal analysis, heat transfer, and thermal management concepts.
• Ability to read and create mechanical drawings, including dimensions and tolerances.
• Strong communication skills and ability to collaborate in a multidisciplinary engineering environment.

Benefits

• Stock
• Health Insurance
• Vision
• Dental
• PTO

Additional Info

• Must be willing to work extended hours and weekends as necessary to accomplish our mission.
• Must work 100% onsite at El Segundo HQ.