Senior Systems Test Engineer — RF/Avionics & HIL Automation

Castelion; Los Angeles (CA); On-site; USD 120,000 - 150,000; Full time

Benefits offered by this job

Stock incentives

Medical, vision, dental insurance

4 weeks PTO

Job summary

Castelion is seeking a Systems Integration & Test Engineer to architect and execute the full suite of hardware test capabilities for moving avionics and control systems from prototype to production.

You will own test requirements, develop automated test equipment, and validate performance across power electronics, digital interfaces, RF assemblies, and motion control, while collaborating with electrical, controls, software, and mechanical teams.

Qualifications

• B.S./M.S. in Electrical, Mechanical, Mechatronics, Aerospace, or related.
• 5+ years of 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).

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.

Skills

Test planning

ATE development

Python scripting

C/C++ programming

RF hardware testing

Embedded control systems

Data acquisition

Failure analysis

Education

B.S./M.S. in Electrical, Mechanical, Mechatronics, Aerospace, or related

Tools

Oscilloscopes

DMMs

Power supplies

Network analyzers

SCPI, VISA

Job description

Castelion is seeking a Systems Integration & Test Engineer to architect and execute the full suite of hardware test capabilities for moving avionics and control systems from prototype to production.

You will own test requirements, develop automated test equipment, and validate performance across power electronics, digital interfaces, RF assemblies, and motion control, while collaborating with electrical, controls, software, and mechanical teams.