Avionics Harness Design Engineer

Why Castelion, Why Now

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability.

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability. This is a rare opportunity to join at an early stage, where you'll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function.

We are seeking an Avionics Harness Design Engineer to lead the design, development, and integration of electrical harnessing across our missile and vehicle systems. This engineer will play a critical role in ensuring robust, manufacturable, and high-reliability electrical connectivity throughout the system. You will partner closely with avionics, power, structures, and propulsion teams to deliver mission-critical hardware in a fast-paced, hardware-rich environment.

You will additionally support avionics and harness integration at the system and vehicle levels.

• 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

• 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, Solid Works Electrical, Capital, Rapid Harness, 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

Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.

This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements.

You will be notified if and when such requirements apply.

Castelion is an Equal Opportunity Employer. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information,…