Join Radiant as a Senior Mechanical Engineer to design critical structures for portable nuclear microreactors in a fast-paced startup environment.
Posted by employer 2 months ago
First seen on Joblaze 1 month ago
Last verified on the company career page 1 day ago
Skills & Technologies
Requirements
- Experience
- 6+ years
- Education
- Bachelor's degree
Not disclosed in this posting: compensation, visa sponsorship.
Benefits
Joblaze summary
In this role, the Senior Mechanical Engineer at Radiant focuses on designing and developing critical structures for the company's portable nuclear microreactor, Kaleidos. Key responsibilities include conducting trade studies, performing detailed structural analyses, and managing the assembly and testing of components. This position is ideal for experienced engineers with a strong background in stress analysis and multi-component assembly design, particularly those who thrive in fast-paced, innovative environments. Radiant's mission to revolutionize nuclear power presents a unique opportunity for impactful work in a startup atmosphere.
Joblaze insights
- Listed about a month ago — first seen on Joblaze September 3, 2026. Last confirmed on Radiant's careers page October 27, 2026.
- Mechanical Engineering appears in 3.4% of 2530 comparable senior other roles in United States; finite element analysis appears in 0.6% of 2530 comparable senior other roles in United States.
Quick facts
- Is the Senior Mechanical Engineer, Structures role remote?
- No — this is an on-site role in El Segundo, CA.
- How much experience is required?
- At least 6 years of relevant experience for this Senior Mechanical Engineer, Structures 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: CAD, Mechanical Engineering, finite element analysis.
- 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, Structures role at Radiant.
From the original posting
About the Role
Radiant is seeking a highly motivated Senior Mechanical Engineer to design and develop critical structures within Kaleidos. You will solve unique challenges creating efficient and reliable structures that facilitate fission while surviving extreme temperature environments and meeting volumetric constraints. 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 structures such as mass-efficient transportable shielding systems, container system, and high temperature graphite and metallic systems.
Conduct trade studies and develop designs to meet program requirements.
Perform detailed thermomechanical analysis (static strength, durability/fatigue) and dynamic analysis (vibration, shock) to determine structural integrity (margins of safety) 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, Aeronautical, Civil or Structural Engineering.
6+ years of experience designing structures.
4+ 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 resolving thermal expansion issues in designs.
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.
Standard company text repeated across Radiant's postings is omitted here.