Join Radiant as a Senior Mechanical Engineer to lead the design of critical fluid systems for innovative portable nuclear microreactors.
Posted by employer 5 months ago
First seen on Joblaze 1 month ago
Last verified on the company career page 10 hours ago
Skills & Technologies
Requirements
- Experience
- 4+ years
- Education
- Bachelor's degree
Not disclosed in this posting: compensation, visa sponsorship.
Benefits
Joblaze summary
In this role, the Senior Mechanical Engineer will take charge of the design and production of fluid systems for Radiant's innovative microreactor, focusing on components like compressors and heat exchangers. Key skills include expertise in fluid dynamics, thermodynamics, and experience with thermal hydraulic analysis and piping design. This position is ideal for engineers with over four years of relevant experience, particularly those who thrive in fast-paced startup environments. Radiant's mission to revolutionize portable nuclear power offers a unique opportunity to contribute to groundbreaking technology.
Joblaze insights
- Listed about a month ago — first seen on Joblaze September 3, 2026. Last confirmed on Radiant's careers page October 27, 2026.
- Python appears in 16.6% of 2571 comparable senior other roles in United States; fluid dynamics appears in 0.2% of 2571 comparable senior other roles in United States.
Quick facts
- Is the Senior Mechanical Engineer, Fluid Systems role remote?
- No — this is an on-site role in El Segundo, CA.
- How much experience is required?
- At least 4 years of relevant experience for this Senior Mechanical Engineer, Fluid Systems role.
- Where is the role based?
- Radiant is hiring for this position in El Segundo, CA.
- What's the tech stack?
- Joblaze extracted these technologies from the posting: Heat Exchanger Design, MATLAB, Python, Thermodynamics, finite element analysis, fluid dynamics.
- What seniority level is this role?
- Radiant targets senior candidates for this position.
- Is this full-time or contract?
- Full-time for this Senior Mechanical Engineer, Fluid Systems role at Radiant.
From the original posting
About the Role
Radiant is seeking a highly motivated Senior Mechanical 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 :
Professional Engineer (PE) Mechanical license.
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.