Avionics Harness Technician Torrance, CA LA Manufacturing – Avionics

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.

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.

• 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…