Avionics R&D Technician - PCBA, Levels

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.

Castelion is looking for an Avionics PCBA 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 PCBA Technician, you will work closely with engineering and manufacturing teams to execute electrical and electro-mechanical builds in support of development and production activities. This role is focused on hands-on assembly, rework, testing, and hardware integration while supporting manufacturing processes, documentation, and continuous improvement efforts.

• Perform PCBA soldering and rework, including installation of jumpers and component replacement as required
• Build wire harnesses, cable assemblies, PCBAs, electro-mechanical units, and test equipment
• Assemble, integrate, and test avionics hardware and support equipment
• Execute manufacturing and test processes according to work instructions, drawings, and engineering documentation
• Support development builds, prototype builds, and transition into initial production
• Assist with setup and maintenance of tooling, fixtures, and manufacturing equipment
• Read and interpret schematics, wiring diagrams, 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, electronics manufacturing, or related hands‑on assembly experience
• Experience reading electrical schematics and wiring harness drawings
• Experience performing soldering and PCBA rework
• Experience working with IPC‑610 and IPC‑620 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 performing rework on fine-pitch or high-density PCBAs
• Experience building flight hardware, prototype hardware, or test 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…