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