Radiant · 1 month ago
Senior Fluids Systems Engineer
El Segundo, California, United States
Full-time
Onsite
Mid, Senior Level
4+ years expRadiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company is seeking a highly motivated Senior Fluids Systems Engineer to own critical Kaleidos fluid systems from preliminary design through build and production, including responsibilities such as thermal hydraulic analysis, piping design, and vendor selection.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
U.S. Citizen Only
Responsibilities
Own end-to-end engineering of fluid systems and components, including compressors, valves, and heat exchangers
Perform complex thermal and fluids analysis to drive design decisions, verify system performance, and ensure structural integrity using first-principle hand calculations and finite element tools
Perform trade studies to optimize system and meet program requirements
Develop and execute manufacturing/assembly instructions and test plans
Create and manage a Bill-Of-Materials (BOM)
Find and develop suppliers for all components
Own subassembly design, manufacturing, and test schedules
Own risk analysis (FMEA) for subsystems
Collect requirements, provide expertise and feedback to engineers in other functional areas via clear, constructive communication
Qualification
Required
Bachelor's degree from an accredited institution in Mechanical, Materials, Aeronautical, Civil or Structural Engineering
Experience with fluid system architecture design
4+ years of experience in designing, building, and testing fluids systems
Proficient knowledge in fluid dynamics and thermodynamics
Proficient knowledge of heat exchanger design and analysis methods
Preferred
Knowledge of thermodynamic power cycles
Prior experience with designing piping system for thermal growth using hand calculations and FEA tools
Experience with process piping design and testing codes, such as ASME B31.3 and ASME PCC-2
Prior experience with fluid system modeling via Matlab/Python
Experienced in design for manufacturability and ramping up hardware build in a production environment
Experienced in designing and operating test stands
Takes extreme ownership of work and a high degree of responsibility
Excellent communication across multidisciplinary teams
Prior nuclear experience in not required for this role
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.
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
2026-01-07
The Motley Fool
2026-01-04
Globe and Mail
2026-01-03
Company data provided by crunchbase