Join Radiant as a Mechanisms Engineer to design critical mechanisms for portable nuclear microreactors.
Posted by employer 1 day ago
First seen on Joblaze 3 hours ago
Last verified on the company career page 3 hours ago
What you'll build
- Ownership of critical mechanisms
- Conduct trade studies
- Perform detailed thermomechanical analysis
- Develop manufacturing/assembly instructions
- Create and manage a Bill-Of-Materials
Must have
- Bachelor’s degree in Mechanical or Aeronautical Engineering
- 3+ years of experience designing mechanisms
- 3+ years of experience performing stress analysis
Nice to have
- Experience with design of multi-component assemblies in CAD
- Experience designing hardware that was manufactured and deployed
- Experience designing pneumatic systems
- Experience integrating electromechanical components
- Solid understanding and application of GD&T
Practical constraints
- Must work 100% onsite at El Segundo HQ
- Must be willing to work extended hours and weekends
Requirements
- Experience
- 3+ years
- Education
- Bachelor's degree
Not disclosed in this posting: compensation, visa sponsorship.
Benefits
Joblaze summary
The Mechanisms Engineer at Radiant focuses on designing and developing essential mechanisms for the Kaleidos microreactor, tackling challenges related to reactivity control and safety features. Key skills include expertise in stress analysis and experience with CAD for multi-component assemblies, alongside a solid foundation in thermomechanical analysis. This role is ideal for engineers with a background in mechanical or aeronautical engineering and at least three years of relevant experience. Radiant, a startup in the nuclear sector, emphasizes collaboration and innovation in its mission to deliver the first new commercial reactor design in decades.
Joblaze insights
- Listed today — first seen on Joblaze October 9, 2026. Last confirmed on Radiant's careers page October 9, 2026.
Quick facts
- Is the Mechanisms Engineer role remote?
- No — this is an on-site role in El Segundo, CA, United States.
- How much experience is required?
- At least 3 years of relevant experience for this Mechanisms 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 mid-level candidates for this position.
- Is this full-time or contract?
- Full-time for this Mechanisms Engineer role at Radiant.
From the original posting
About the Role
Radiant is seeking a highly motivated Mechanisms Engineer to design and develop critical mechanisms within Kaleidos. You will solve unique challenges creating efficient and reliable mechanisms that control reactivity or actuate critical safety features. You will be responsible for the following: trade studies, material selection, detailed structural analysis, assembly, integration, and testing. You will have an instrumental impact of fueling the first new commercial reactor design in over 50 years by 2026.
Responsibilities & Duties:
Ownership of critical mechanisms such as the control blade actuator or air jacket valves.
Conduct trade studies and develop designs to meet program requirements.
Perform detailed thermomechanical analysis (static strength, durability/fatigue) and kinematic analysis to determine structural integrity and performance margins using both hand calculations and finite element tools.
Develop and execute manufacturing/assembly instructions and test plans.
Create and manage a Bill-Of-Materials (BOM).
Find and develop suppliers for 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 or Aeronautical Engineering.
3+ years of experience designing mechanisms.
3+ years of experience performing stress analysis using both hand calculations and finite element tools (Abaqus, Ansys, FEMAP, or similar).
Desired Qualifications & Skills:
Experience with design of multi-component assemblies in CAD (NX or similar).
Experience designing hardware that was manufactured, deployed, and iteratively improved.
Experience designing pneumatic systems.
Experience integrating electromechanical components such as motors or encoders.
Experience working with interdisciplinary teams.
Solid understanding and application of GD&T.
Proficiency with both “hand calc” analytical methods and higher fidelity finite element-based analysis methods.
Ability to derive free-body diagrams for systems with which one was not previously familiar.
Self-motivated with strong organizational, written, and oral communication skills.
Experience with using text-based software development tools.
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.
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