Mechanical Engineer, Structures

Job Description

Mechanical Engineer, Structures | Radiant

The Tone:
This is an early career role at Radiant, located in El Segundo, CA. Radiant is developing the Kaleidos Development Unit (KDU), the United States’ first new fueled reactor design in over 50 years. This role is crucial for advancing KDU’s readiness for fueled operations by contributing directly to the design, assembly, and testing of its structural components. You will work alongside a cross-disciplinary team, taking ownership of projects from concept through validation.

The TL;DR
• Role: Early Career
• Type: Full-time
• Location: El Segundo, CA (In-person)
• Pay: $95000–$105000 yearly
• Team: KDU Engineering team
• Mission: Own projects that advance KDU’s readiness for fueled operations by contributing to structural component design, analysis, and testing.
• Tech Stack: CAD, analysis software, lab instrumentation

What You’ll Actually Do
• Design: Contribute to the design, analysis, and testing of KDU structural components.
• Project Ownership: Take ownership of deliverables from concept through build and validation with guidance from senior engineers.
• Collaboration: Collaborate across disciplines to integrate designs and resolve technical challenges.
• Support: Support system-level testing, troubleshooting, and design iteration to accelerate KDU development.
• Communication: Communicate results through design reviews, technical reports, and presentations to peers and leadership.

The Must-Haves
• Background: BS in Mechanical Engineering, Aerospace Engineering, or a related discipline (completed or expected Spring 2026). Strong foundation in engineering first principles.
• Experience: Hands-on experience in design and build acquired through projects, research, labs, or internships.
• Skills: Proficiency with engineering tools such as CAD, analysis software, and lab instrumentation.
• Bonus: MS in Mechanical Engineering, Aerospace Engineering, or a related discipline (completed or in progress). Prior internship, co-op, or project-based experience related to structures. Ability to independently solve complex engineering tasks and proactively seek out resources. Comfort working in a startup environment with a collaborative, mission-driven mindset. Excitement for Radiant’s mission. Knowledge of reactor physics is helpful but not required.