Join Radiant as a Senior Fluid Systems Engineer to design and build critical fluid systems for portable nuclear microreactors.
Posted by employer 19 hours ago
First seen on Joblaze 12 hours ago
Last verified on the company career page 12 hours ago
What you'll build
- Own end-to-end engineering of fluid systems and components
- Perform complex thermal and fluids analysis
- Perform trade studies to optimize system
- Develop and execute manufacturing/assembly instructions
- Own risk analysis for subsystems
Must have
- Bachelor’s degree in Mechanical, Materials, Aeronautical, Civil or Structural Engineering
- 5+ years of experience in designing, building, and testing fluids systems
- Proficient knowledge in fluid dynamics and thermodynamics
Nice to have
- Knowledge of thermodynamic power cycles
- Prior experience with designing piping system for thermal growth
- Experience with process piping design and testing codes
Practical constraints
- Must work 100% onsite at El Segundo HQ
- Must be willing to work extended hours and weekends
Requirements
- Experience
- 5+ years
- Education
- Bachelor's degree
Not disclosed in this posting: compensation, visa sponsorship.
Benefits
Joblaze summary
The Senior Fluid Systems Engineer at Radiant is responsible for the design and management of critical fluid systems for the company's portable nuclear microreactors, overseeing everything from initial design to production. Key skills include expertise in fluid dynamics, thermal analysis, and heat exchanger design, along with a solid background in engineering principles. This role is suited for experienced engineers with at least five years in fluid systems design, particularly those who can navigate complex technical challenges. Radiant, a startup focused on innovative nuclear solutions, emphasizes a collaborative environment and hands-on problem-solving.
Joblaze insights
- Listed today — first seen on Joblaze October 13, 2026. Last confirmed on Radiant's careers page October 13, 2026.
Quick facts
- Is the Senior Fluid Systems Engineer role remote?
- No — this is an on-site role in El Segundo, CA, United States.
- How much experience is required?
- At least 5 years of relevant experience for this Senior Fluid Systems Engineer role.
- Where is the role based?
- Radiant is hiring for this position in El Segundo, CA, United States.
- What seniority level is this role?
- Radiant targets senior candidates for this position.
- Is this full-time or contract?
- Full-time for this Senior Fluid Systems Engineer role at Radiant.
From the original posting
About the Role
Radiant is seeking a highly motivated Senior Fluid Systems Engineer to own critical Kaleidos fluid systems from preliminary design through build and production. These systems include the primary loop subsystems and power conversion loop, serving to convert heat from the reactor core into electrical power. You will be responsible for the following: trade studies, component selection, thermal hydraulic analysis, piping design, vendor selection, assembly, and testing. You will have an instrumental impact of fueling the first new commercial reactor design in over 50 years by 2026.
Responsibilities & Duties:
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.
Required Qualifications & Skills :
Bachelor’s degree from an accredited institution in Mechanical, Materials, Aeronautical, Civil or Structural Engineering.
Experience with fluid system architecture design.
5+ 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.
Desired Qualifications & Skills :
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.
Additional Requirements:
Must be willing to work extended hours and weekends as necessary to accomplish our mission.
Benefits and Perks
Stock: Substantial incentive stock plan for all full-time employees.
Daily catered lunch. Free snacks and drinks.
Flexible PTO policy. Remote workday allocation.
Standard company text repeated across Radiant's postings is omitted here.