Avionics Harness Design Engineer

About the role

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus and technical excellence are decisive advantages - and we are building a team that can deliver real capability, not just concepts. This is a rare opportunity to join at an early stage, where your work will directly shape critical systems, influence major technical decisions, and have immediate, real-world impact.

Responsibilities

• Design, route, and document electrical harnesses to support missile and vehicle system integration
• Generate wiring diagrams, schematics, and harness assembly drawings in accordance with aerospace standards
• Select appropriate wires, connectors, backshells, shielding, and protection materials to meet environmental and system requirements
• Collaborate with avionics, power, and structural engineering teams to ensure proper integration of harnesses into overall vehicle design
• Develop and maintain harness BOMs (bill of materials) and ensure manufacturability at scale
• Support harness build, installation, and troubleshooting during integration and testing
• Ensure designs meet electrical, mechanical, and thermal requirements for high-reliability aerospace applications
• Identify and implement process improvements to increase efficiency, manufacturability, and quality

Requirements

• Bachelor's or Master's degree in Electrical Engineering, Mechanical Engineering, Aerospace Engineering, or related field
• 2+ years of experience in cable harness design for aerospace, defense, or high-reliability hardware systems
• Proficiency with CAD/ECAD tools for harness design (e.g., CATIA, Creo, SolidWorks Electrical, Capital, RapidHarness, AutoCAD, or equivalent)
• Strong knowledge of aerospace wiring standards (e.g., IPC/WHMA-A-620, NASA-STD-8739, or MIL-SPEC requirements)
• Familiarity with harnessing in environments with high thermal and small volume requirements
• Hands-on experience supporting harness manufacturing, assembly, and testing
• Ability to work cross-functionally with avionics, power, propulsion, and integration teams
• Strong problem-solving and troubleshooting skills in test and integration environments
• Ability to obtain and maintain a U.S. government–issued security clearance (U.S. citizenship required)

Benefits

• Meaningful long-term equity for all full-time employees
• Four (4) weeks of paid time off
• Ten (10) company-paid holidays
• Comprehensive health benefits – 100% employee-covered medical and strong dependent coverage, plus dental and vision plans
• Paid parental leave
• $100 monthly fitness stipend
• Onsite EV charging
• Catered meals, company-covered food during high-demand periods, fully stocked kitchen