Senior Stress Engineer

About the Role

Radiant is seeking a Stress Engineer to own and execute structural loads, vibration, and dynamic analyses for complex mechanical systems associated for Kaleidos, the world's first portable microreactor and supporting hardware. You will play a critical role in ensuring structural integrity and survivability across all phases of the product lifecycle, including manufacturing, transportation, handling, deployment, and operational environments.

This role requires a hands-on engineer who is comfortable working in ambiguous, fast-paced environments and collaborating closely with structures, mechanical design, thermal, nuclear, and test teams.

Responsibilities & Duties:

• Develop and own static, dynamic, and transient loads for reactor systems, support structures, and transport configurations.

• Perform structural dynamics analyses, including modal, random vibration, shock, sine vibration, and fatigue assessments.

• Implement explicit dynamics simulations to model nonlinear reactor response under transient seismic and transportation event cases.

• Define and analyze transportation and handling environments, including shock and vibration from road, rail, air, or sea transport.

• Generate load cases and environments to support structural sizing, design margins, and verification plans.

• Conduct finite element analyses (FEA) using tools such as ANSYS, Abaqus, or similar tools.

• Collaborate with design engineers to influence hardware architecture, material selection, and joint design.

• Support test planning and correlation, including shaker tests, modal surveys, and structural verification testing.

• Develop and maintain analysis documentation, reports, and requirements for internal reviews and regulatory interfaces.

• Contribute to failure investigations, root cause analyses, and design improvements

• Help establish best practices for loads, dynamics, and structural verification within a growing engineering organization.

Required Qualifications & Skills:

• Bachelor’s degree in Mechanical Engineering, Aerospace Engineering, Structural Engineering, or a related field.

• 4+ years of professional experience in stress, loads, dynamics, or structural analysis for complex mechanical systems.

• Strong fundamentals in structural mechanics, dynamics, and vibration.

• Experience with finite element modeling and analysis of metallic and composite structures.

• Proficiency with industry-standard FEA tools (e.g., ANSYS, Abaqus, Nastran).

• Familiarity with design allowables, safety factors, and margin-of-safety methodologies.

• Ability to work cross-functionally and communicate analysis results clearly to both technical and non-technical stakeholders.

Desired Qualifications & Skills:

• Experience in aerospace, launch, defense, nuclear, or heavy industrial hardware environments.

• Dynamics modeling software experience (LD-Dyna, Abaqus explicit, or other).

• Background in shock and vibration testing and test-article correlation.

• Knowledge of fatigue, fracture mechanics, and bolted joint analysis.

• Experience defining or interpreting environmental specifications and requirements.

• Master’s degree or PhD in a relevant engineering discipline.

• Familiarity with nuclear, spaceflight, or safety-critical system requirements.

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.