About the role

Senior Avionics Systems Engineer We are seeking a Senior Avionics Systems Engineer to define and deliver the avionics architecture for Castelion's long-range hypersonic strike vehicles. This role is responsible for the overall integration of the vehicle's avionics systems, ensuring that power, control electronics, communications, sensors, embedded computing, and flight software function as a cohesive flight system. You will work hands-on with multidisciplinary engineering teams to architect, integrate, test, and validate flight electronics from concept through flight test in a fast-paced, hardware-driven environment.

Responsibilities Define and maintain the avionics system architecture for flight vehicles, including power distribution, communications, grounding, interfaces, and system integration Lead the integration of avionics subsystems, including flight computers, sensors, power electronics, control electronics, RF systems, flight termination systems, and propulsion electronics Develop system-level

requirements, interface definitions, wiring architectures, and integration documentation Work closely with electrical, mechanical, software, GNC, propulsion, and manufacturing teams to ensure seamless integration of vehicle subsystems Lead system-level hardware integration, bring-up, debugging, and troubleshooting during development and flight vehicle assembly Define electrical design standards, component selection guidelines, and best practices for high-reliability flight electronics Support design reviews and make system-level technical trades to optimize performance, reliability, manufacturability, and testability Develop and execute integration, qualification, and flight test plans, translating results into system-level improvements Mentor electrical engineers across multiple disciplines and contribute to best practices in avionics system architecture and integration Partner closely with program leadership to make technical trades aligned with mission success Basic

Qualifications Bachelor's, Master's, or PhD in Electrical Engineering or related field 8+ years of experience designing and integrating avionics or other high-reliability embedded electronic systems for aerospace or defense applications Strong background in avionics system architecture, power distribution, communications interfaces, and embedded hardware integration Experience leading the development and integration of complex avionics systems from concept through qualification and flight testing Experience with schematic capture and PCB design using Altium Designer or equivalent ECAD tools Strong understanding of analog, digital, power, and embedded electronics design principles Familiarity with common aerospace interfaces and communication protocols (e.g., SPI, I²C, UART, CAN, Ethernet, RS-422/485, LVDS, or similar) Experience with hardware integration, system-level debugging, and root cause analysis in laboratory and flight test environments Strong understanding of EMI/EMC, grounding, shielding, and electrical reliability considerations for aerospace systems Strong problem-solving mindset, thriving in a fast-paced, hardware-rich, high flight cadence environment B enefits And

Castelion is a modern defense production company building long-range hypersonic strike systems to address a critical national security gap. Founded in 2021, Castelion was created in response to the recognized need for the United States to rapidly develop hypersonic capabilities to remain competitive with near-peer adversaries and deter future conflicts.

The company operates under the philosophy of "Peace through Deterrence" — building the weapons systems that ensure conflicts never need to happen. Castelion is one of the few companies in the hypersonics space that has moved beyond concepts to actual production deliverables, with government contracts across multiple branches of the military and a $23M+ Navy order for 50 units in calendar year 2027.

Backed by over $469M in funding from top-tier investors including Andreessen Horowitz, Lightspeed Venture Partners, and General Catalyst, Castelion is scaling rapidly. The company is building what it anticipates will become the preeminent hypersonics campus in the country — including a $150M, 1,000-acre solid rocket motor manufacturing facility in Rio Rancho, New Mexico, alongside its headquarters in Torrance, California.

Castelion's culture is defined by technical excellence, ownership, and velocity. Engineers own meaningful subsystems on the vehicle and are responsible for driving their success. The company follows a responsible engineering model inspired by SpaceX, where individuals choose the highest-value work and are empowered to cultivate resources and partnerships to deliver results. The engineering bar is exceptionally high — attracting elite talent who want to be surrounded by other elite talent.

Senior Avionics Systems Engineer

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