PCB Librarian Torrance, CA 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.

As a PCB Librarian, you will own the management, curation, and quality of Castelion's PCB component libraries and associated design data. You will ensure that schematic symbols, footprints, and part metadata are accurate, compliant, and ready for integration into complex avionics systems. This role partners closely with PCB layout, electrical, and manufacturing teams to enable rapid, reliable, and high-quality hardware development across analog, digital, RF, and power domains.

You will be expected to drive standardization, enforce best practices, and maintain library integrity, enabling engineering teams to efficiently deliver flight-ready PCBs on aggressive schedules.

• Own the creation, maintenance, and standardization of PCB component libraries (symbols, footprints, 3D models, and metadata) for avionics hardware.
• Ensure libraries are accurate, manufacturable, and compliant with IPC Class 3/3A and Castelion internal standards.
• Collaborate with PCB layout and electrical engineers to translate schematic intent into reliable, reusable library components.
• Maintain and version‑control library data, ensuring proper documentation and traceability for production release.
• Interface with vendors to confirm part specifications, availability, and manufacturability.
• Review new component requests and validate footprints, 3D models, and pin assignments.
• Support high-density, multi-layer PCB designs through accurate component representation and layout constraints.
• Enable rapid iteration cycles by providing verified, production-ready library components for design re-spins.
• Mentor junior engineers on library best practices, IPC standards, and DFM considerations.
• Collaborate across electrical, mechanical, systems, and manufacturing teams to ensure library and design alignment.
• Contribute to continuous improvement of Castelion's PCB library standards, processes, and tools.

• 5+ years of experience in PCB design, component management, or electronics hardware development.
• Strong proficiency in Altium (preferred) or equivalent professional PCB design tools.
• Experience managing component libraries, including symbols, footprints, 3D models, and metadata.
• Solid understanding of high-density, multi-layer PCB design practices.
• Familiarity with signal integrity, power distribution, grounding, EMI/EMC, and thermal considerations.
• Knowledge of PCB fabrication, assembly processes, materials, and manufacturing constraints.
• Strong attention to detail, problem-solving skills, and ownership mindset.
• Ability to work effectively in cross-functional engineering teams and communicate across disciplines.

• Experience in aerospace, missile systems, spaceflight, defense, or other high-reliability environments.
• Familiarity with boards containing microcontrollers, DSPs, FPGAs, ASICs, high-speed interfaces, RF/mixed-signal circuits, or power management.
• Experience supporting EMI/EMC mitigation through library and layout techniques.
• Knowledge of industry standards (e.g., MIL-STD, DO-254).
• Familiarity with signal and power integrity tools (e.g., SiWave, HFSS, ADS, CST).
• Experience supporting hardware through environmental testing and qualification.
• Ability to…