Senior Avionics Test Engineer

We are looking for a Senior Avionics Test Engineerto architect and execute the full suite of hardware test capabilities needed to move our avionics and control systems from prototype to production. In this role, you will own test requirements, automated test equipment (ATE) development, integration, validation, and performance characterization across domains including power electronics, digital interfaces, RF assemblies, motion control, and flight avionics.

You will design fixtures, build automated test stations, support DVT and qualification, and define the test performance envelope for components, circuit cards, and integrated sub-systems. This role blends hands-on lab work with systems-level reasoning and close collaboration with electrical, controls, software, and mechanical engineering teams.

Responsibilities

• Develop and execute test plans at component, subassembly, and integrated system levels
• Design and build test fixtures, HIL environments, and automated test rigs
• Validate hardware performance across electrical, digital, mechanical, and RF metrics
• Instrument and log tests to ensure precision and traceability
• Lead failure analysis and root-cause investigations
• Support hardware teams by feeding test results back into design cycles
• Drive qualification and environmental test campaigns (thermal, vibe, EMI)
• Deploy and validate automated test equipment for boards and sub-systems

Avionics, Testing, Avionics, Testing, Electronics, Control Systems, Hardware Quality Assurance, Prototyping, Test Requirements, Motion Control, * B.S./M.S. in Electrical, Mechanical, Mechatronics, Aerospace, or related

• Experience testing high-power subsystems, high-speed digital interfaces, actuators, or RF hardware
• Hands-on experience developing automated test equipment using instruments such as oscilloscopes, DMMs, power supplies, loads, switch matrices, network analyzers, etc.
• Familiarity with embedded control systems and interfaces (CAN, RS-422/485, SPI, Ethernet)
• Experience with instrumentation control and data acquisition (Python, C++, protobufs, scripting)
• Ability to work independently and lead cross-functional test integration

Preferred Skills and Experience

• Experience in RF testing fundamentals or more advanced knowledge of Radar architecture
• Experience with software development for test automation for digital, power, and RF electronics (Python preferred)
• Experience controlling test instrumentation using SCPI, VISA, or PyVISA commands
• Experience developing GUIs or dashboards
• Experience in writing custom scripts for data analysis & database creation
• Experience writing software for Environmental Chambers and/or RF Chambers
• Exposure to flight-like test environments, including environmental stress screening (ESS)
• Experience with fault injection, failure mode testing, and reliability qualification for mission-critical systems
• Working knowledge of C/C++ or Python for custom test tooling or embedded systems debugging
• Background supporting flight test or launch operations.

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.