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 Hardware Engineer, Senior, Staff

We are hiring experienced Avionics Hardware Engineers to specialize in high-speed digital design, flight computer architecture, and advanced avionics hardware development across our avionics organization. This role is ideal for engineers with deep EE fundamentals and hands-on ownership experience designing complex embedded hardware for mission-critical systems.

Engineers in this role focus on flight computer architecture, high-speed digital board design, system bring-up, and hardware validation across real flight hardware. The ideal candidate has experience owning complex board designs from architecture through integration and thrives in fast-paced hardware development environments.

Responsibilities

Design and develop advanced board-level electrical hardware including schematic capture, PCB layout oversight, component selection, and interface definition
Own high-speed digital and embedded flight computer architectures including processors, memory systems, and board-level integration
Perform board bring-up, validation, debugging, and root-cause analysis in the lab
Test reference boards and early prototypes using standard lab equipment
Drive signal integrity, power integrity, and hardware reliability considerations throughout the design lifecycle
Work with avionics, embedded software, test, and manufacturing teams to iterate designs quickly
Support hardware/software integration and troubleshooting across avionics platforms
Document designs, test results, and engineering changes clearly

Basic Qualifications

Bachelor's degree in electrical engineering or related field
Strong experience with complex digital or mixed-signal hardware design
Experience with high-speed digital systems, embedded processors, memory interfaces, and board-level architecture
Experience with PCB design tools (Altium preferred)
Hands-on experience with oscilloscopes, logic analyzers, and power supplies
Strong understanding of core EE principles including digital systems, signal integrity, power distribution, and hardware debugging
Comfortable working in a fast-paced, highly collaborative environment

Preferred Qualifications

Experience owning flight computer, avionics, or embedded compute hardware architectures
Experience taking complex PCBAs from concept through bring-up, validation, and integration
Exposure to embedded systems, firmware, or FPGA interaction
Familiarity with aerospace, automotive, robotics, defense, or other high-reliability hardware environments
Familiarity with interfaces such as Ethernet, SPI, I2C, UART, CAN, PCIe, or DDR memory systems
Basic scripting or programming experience (Python, C/C++)

Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.

Other Duties

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.

Additional Eligibility Requirements

This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply.