Avionics Harness Technician

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.

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.

Avionics Harness Technician

Castelion is looking for an Avionics Harness Technician, reporting to the Manager, R&D Operations, to support the development and production of systems required for long-range hypersonic strike vehicles. This will be a full-time, non-exempt position located in our Torrance, California facility.

As an Avionics Harness Technician, you will work closely with engineering and manufacturing teams to build, integrate, inspect, and test avionics harnesses, cable assemblies, and electro-mechanical hardware in support of development and production activities. This role is focused on hands-on harness fabrication, connector assembly, crimping, soldering, electrical testing, hardware integration, and supporting manufacturing processes, documentation, and continuous improvement efforts.

Responsibilities

• Build wire harnesses, cable assemblies, electro-mechanical units, and test equipment

• Perform wire preparation, stripping, crimping, soldering, shielding, splicing, labeling, lacing, and connector assembly

• Assemble, integrate, and test avionics harnesses, electrical hardware, and support equipment

• Perform continuity, insulation resistance, and high potential (HiPot) testing as required

• Execute manufacturing and test processes according to work instructions, drawings, wiring diagrams, and engineering documentation

• Support development builds, prototype builds, and transition into initial production

• Read and interpret schematics, wiring diagrams, harness drawings, assembly drawings, and controlled documentation

• Identify build issues and escalate discrepancies to engineering or manufacturing leadership

• Support process improvement initiatives focused on quality, repeatability, and efficiency

• Maintain a clean, organized, and ESD-compliant work environment

• Monitor work progress against schedules and support production priorities as needed

Basic Qualifications

• 2+ years of avionics technician, harness assembly, electronics manufacturing, or related hands-on assembly experience

• Experience building wire harnesses and cable assemblies

• Experience reading electrical schematics, wiring diagrams, and harness drawings

• Experience performing crimping, soldering, connector assembly, and harness routing

• Experience performing continuity, insulation resistance, and HiPot testing on electrical harnesses or assemblies

• Experience working with IPC/WHMA-A-620 or equivalent workmanship standards

• Familiarity with avionics, electrical, or electro-mechanical assembly processes

• Ability to follow work instructions, engineering drawings, and controlled documentation

• Strong attention to detail and workmanship quality

• Experience working in an ESD-controlled manufacturing environment

• Ability to work effectively in a fast-paced development and production environment

Preferred Skills and Experience

• Experience in aerospace, defense, or other highly regulated industries

• Experience building flight harnesses, prototype harnesses, or test systems

• Experience with shield termination, backshell assembly, splicing, lacing, and harness strain relief

• Experience using harness test equipment such as Cirris or equivalent systems

• Familiarity with manufacturing documentation and configuration-controlled environments

• Experience supporting engineering development builds and rapid iteration efforts

• Familiarity with Atlassian tools such as JIRA and Confluence

• Basic understanding of electronic troubleshooting and diagnostics

• Strong communication and teamwork skills

• Ability to adapt to changing priorities and evolving hardware designs

Additional Requirements

• Must be willing to work extended hours and/or weekends as needed

• Must be able to travel up to 20% of the time

Leadership Qualities

• Bias to Action and Creative Problem Solving . Desire and experience questioning assumptions in ways that lead to break through ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. Ability to personally resolve minor issues in development without requiring significant support.

• High Commitment, High Initiative . A successful candidate will have a genuine passion for Castelion's mission and consistently look for ways to contribute to the company's technical goals and prevent hardware blockers. Ability to work in a fast paced, autonomously driven, and demanding atmosphere. Strong sense of accountability and integrity.

• Clear Communicator. Proactively communicates blockers. Trusted in previous roles to be voice of company with regulators, suppliers, gate keepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminate ambiguity.

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

Other Duties

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.

Additional Eligibility Requirements

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.

Affirmative Action/EEO Statement

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, protected veteran status, or any other characteristic protected by applicable federal, state, or local law.

Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact View email address on aiapply.co. Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law.

Castelion is committed to fostering a workplace where employment decisions are based on qualifications, business needs, and the ability to perform the essential functions of the role, with or without reasonable accommodation.

EAR/ITAR Requirements

This position requires access to export-controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export-controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.