Radiant · 14 hours ago
Mechanical Engineer, Electrical Systems
El Segundo, California, United States
Full-time
Onsite
New Grad, Entry LevelRadiant is an El Segundo-based startup building the world’s first mass-produced, portable nuclear microreactors. They are seeking a highly motivated early-career Mechanical Engineer to support the design and integration of electrical components and subsystems in a fast-paced startup environment, contributing to the development of advanced hardware.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
U.S. Citizen Only
Responsibilities
Support the mechanical design and ownership of electrical components and subsystems, including:
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
Assist in the design and setup of test fixtures and test stands for acceptance and qualification testing
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
Develop, document, and execute basic test plans and procedures to verify mechanical and thermal performance
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
Qualification
Required
Bachelor's degree in Mechanical Engineering or a closely related field from an accredited institution
Hands-on experience with mechanical design through coursework, labs, internships, senior design projects, or engineering clubs
Proficiency or coursework 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
Introductory 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
Substantial incentive stock plan for all full-time employees.
100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
Sponsored memberships for eligible employees and their dependents.
100% premium coverage for top tier plan + 50% for dependents.
100% premium coverage for top tier plan (including orthodontia) + 50% for dependents.
Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.
8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.
Daily catered lunch.
Free snacks and drinks.
Flexible PTO policy.
Remote workday allocation.
Company and team-bonding events, happy hours and in-person camaraderie.
Beautiful El Segundo headquarters close to the Pacific Ocean.
Company
Radiant
Radiant develops portable nuclear microreactors designed to generate electricity and heat in a compact, factory-built form.
Founded in 2019
51-200 employees
Funding
Current Stage
Late StageTotal Funding
$518.82MKey Investors
Andreessen HorowitzUnion Square Ventures
2025-12-17Series D· $300M
2024-11-14Series C· $165M
2023-04-18Series B· $40M
Leadership Team
Doug Bernauer
Chief Executive Officer
Recent News
alleywatch.com
2026-01-23
2026-01-07
The Motley Fool
2026-01-04
Company data provided by crunchbase