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.

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.

• 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 elevate 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

• 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

• 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

• Must be willing to work extended hours and/or weekends as needed
• Must be able to travel up to 20% of the time

• 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.…