Mechanisms Engineer

Radiant; El Segundo (CA); On-site; USD 140,000 - 210,000; Full time

Benefits offered by this job

Stock option plan

Medical plan (Silver+ entry) with dep.

One Medical membership

Vision coverage

Dental coverage

Parental leave

Education program

Daily catered lunch

Flexible PTO

Job summary

Radiant, based in El Segundo, CA, seeks a Mechanisms Engineer to design and develop critical mechanisms for Kaleidos. You will perform trade studies, material selection, and detailed analyses to ensure reliability and safety.

Responsibilities include BOM management, supplier development, and test planning. Candidates should have 3+ years of mechanism design and stress analysis experience, with CAD NX and FEA proficiency. This is an onsite role at Radiant HQ.

Qualifications

• Bachelor's in Mechanical or Aeronautical Engineering from an accredited institution.
• 3+ years designing mechanisms and performing stress analysis.
• Experience with hand calculations and finite element tools.

Responsibilities

• Own critical mechanisms such as actuators and valves.
• Perform trade studies and develop designs meeting requirements.
• Carry out thermomechanical and kinematic analyses for integrity.
• Develop assembly instructions and test plans.
• Create and manage a BOM for subassemblies.
• Identify suppliers and manage subassembly schedules.
• Lead risk analysis (FMEA) for subsystems.
• Collaborate with engineers across functions and communicate clearly.

Skills

Mechanisms design

Stress analysis

CAD NX

FEM/FEA

GD&T

Pneumatic systems

Electromechanical integration

Interdisciplinary collaboration

Documentation & communication

Free-body diagrams

Text-based software tools

Education

Bachelor's degree in Mechanical or Aeronautical Engineering

Tools

Abaqus

Ansys

FEMAP

Job description

About Radiant

Radiant is an El Segundo, CA-based company building the world's only mass-produced, transportable nuclear microreactors. The U.S. grid is under growing strain, with power demand accelerating, driving higher utility costs, rising carbon emissions, and interconnection backlogs. Radiant has a solution, transportable, on-site power. Our first reactor, Kaleidos, is 1 megawatt: small enough to be factory-built, transported by land, sea, or air, and deployed wherever power is needed. 1 MW can power 1000 homes for five years. Ship it back and we refuel for a 20 year operating life. We made energy a product that can be used for critical infrastructure like military bases, data centers, hospitals, and remote sites, as well as the commercial main street businesses that keep America running. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Navy and Air Force and has signed pre-order agreements with Equinix, with deployments beginning in 2028.

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.

• Must work 100% onsite at El Segundo HQ.

Benefits and Perks

• Stock: Substantial incentive stock plan for all full-time employees.

• Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.

• One Medical: Sponsored memberships for employees and their dependents.

• Vision: 100% top tier plan coverage + 50% for dependents.

• Dental: 100% top tier plan coverage, orthodontia extra, 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.

• Nuclear Engineering Certificate Program: 100% covered educational program with Penn State University, for eligible employees, to rapidly upscale into nuclear.

• 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.

Total Compensation and Benefits
Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s full-time new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant.
The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team.
We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.

This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.