Castelion · 1 day ago
Test Development Engineer
Torrance, CA
Full-time
Onsite
Mid Level
$100K/yr - $160K/yr
3+ years expCastelion is innovating in defense development and production, focusing on rapid testing and modern manufacturing strategies. The Development Test Engineer will be responsible for planning, executing, and analyzing tests to ensure designs are turned into flight-ready hardware, collaborating closely with engineering and operations teams.
AerospaceGovernmentManufacturingMilitaryNational Security
No H1B
U.S. Citizen OnlyHiring Manager
Nicholas Sparks
Responsibilities
Own development and qualification testing for avionics, mechanisms, propulsion, structures, and integrated vehicle subsystems
Design and build test fixtures, ground support equipment (GSE), and instrumentation for benchtop, environmental, and system-level tests
Author test plans, procedures, and reports aligned with program requirements and qualification intent
Execute vibration, thermal, shock, EMI/EMC, functional, and performance testing
Instrument hardware and vehicles with sensors (strain, temp, pressure, accel, current/voltage) and DAQ systems
Lead anomaly detection, root-cause analysis, and corrective action closure
Partner closely with design engineering to feed test results back into rapid design iteration
Support integration operations, range testing, and flight test campaigns as needed
Maintain rigorous configuration control, data management, and test documentation
Improve test infrastructure, automation, and data quality to increase test cadence and learning velocity
Qualification
Required
Bachelor's degree in Mechanical, Electrical, Aerospace, or related engineering field
3+ years of hands-on development and test experience (academic, industry, or both)
Experience planning and executing hardware tests from concept through report-out
Proficiency with test instrumentation and lab equipment (DAQs, oscilloscopes, power supplies, sensors)
Ability to design and fabricate simple test fixtures and GSE (CAD + shop familiarity)
Strong debugging, troubleshooting, and root-cause analysis skills
Comfortable working across disciplines in high-ownership environments
Willingness to support extended hours, weekends, travel, and on-site operations during critical test campaigns
Operates with high ownership, bias to action, attention to detail, and a test-driven engineering mindset
Comfortable working in fast-moving environments where hardware is the source of truth
Preferred
Aerospace, missile, launch vehicle, space, or defense hardware testing
Environmental testing: vibration, thermal-vacuum, thermal cycling, shock
Test automation and data analysis using Python, MATLAB, or similar
Flight test, range operations, or hardware-in-the-loop (HIL) experience
Familiarity with requirements verification, qualification evidence, and failure tracking
Hands-on machining, wiring, soldering, or rapid prototyping experience
Benefits
Long-term stock incentives
Comprehensive medical, vision, and dental insurance
Four weeks of paid time off per year
Company
Castelion
Castelion is a defense tech company that applies modern hardware development and manufacturing processes to national security challenges.
51-200 employees
Funding
Current Stage
Growth StageTotal Funding
$469.61MKey Investors
Lightspeed Venture PartnersSilicon Valley BankAndreessen Horowitz
2025-12-05Series B· $350M
2025-01-29Series A· $70M
2025-01-29Debt Financing· $30M
Leadership Team
Bryon Hargis
Founder // CEO
Andrew Kreitz
Co-Founder and CFO
Recent News
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