Avionics Hardware Engineer

About the job Avionics Hardware Engineer Avionics Hardware EngineerCompany: Castelion Location: Torrance, CA (in office 5 days per week) Compensation: $150,000 - $200,000 + competitive equity Employment Type: Full-time Visa Sponsorship: Not available (US citizens and green card holders) About Castelion Castelion is a modern defense production company building long-range hypersonic strike systems to close a critical national security gap. Founded in 2021 under a philosophy of "peace through deterrence," it is one of the few hypersonics companies to move beyond concepts to production, with active government contracts including a $23M+ Navy order for 50 units delivering in 2027. Castelion has raised $1B+ through its Series C. The Role Castelion is hiring Avionics Hardware Engineers (3-8 years) to own mission-critical flight hardware end to end. You will design complex mixed-signal, high-speed PCBs from architecture and requirements through schematic design, component selection, bring-up, debugging, verification and vehicle integration. The avionics are the brain of the missile system, and with 15+ boards in development, each engineer owns meaningful subsystems that directly affect flight success. What You Will Do Own the full design lifecycle of circuit card assemblies: requirements, schematics, PCB layout, bring-up, debugging and qualification. Design mixed-signal, high-speed boards with processors, memory, Ethernet, power electronics, sensor/actuator interfaces and backplanes. Work with supply chain on component selection, ordering and supplier relationships. Test and verify hardware against requirements and iterate on designs. Integrate qualified hardware into the vehicle and support production readiness. What You Bring 3-8 years of hardware/PCB design experience Mixed-signal and high-speed digital board design through bring-up and qualification Altium Designer or Cadence Allegro Power electronics experience US citizenship or green card (defense work) Ability to work on-site in Torrance 5 days a week Tech Stack Altium Designer, Cadence Allegro, PCB design, mixed-signal and high-speed digital design, power electronics, schematic capture, Python