Senior Avionics Test Engineer
About The Position
Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus and technical excellence are decisive advantages - and we are building a team that can deliver real capability, not just concepts. This is a rare opportunity to join at an early stage, where your work will directly shape critical systems, influence major technical decisions, and have immediate, real-world impact. We are looking for a Senior Avionics Test Engineer to 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.
Requirements
- 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
- U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.
Nice To Haves
- 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.
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
Benefits
- Meaningful long-term equity
- Four (4) weeks of paid time off
- Ten (10) company-paid holidays
- Comprehensive health benefits - including 100% employee-covered medical and strong dependent coverage
- Dental and vision plans
- Paid parental leave
- $100 monthly fitness stipend
- Onsite EV charging
- Catered meals
- Company-covered food during high-demand periods
- Fully stocked kitchen
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What This Job Offers
Job Type
Full-time
Career Level
Senior
