Senior Development Test Engineer - Mechanisms

Mariner - Californiafull time

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senior

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Castelioncorporation The Senior Development Test Engineer at Castelion owns the planning, execution, and analysis of tests for flight-ready mechanisms. This role designs test stands and automation software to enable rapid testing and iterative design for hypersonic strike missile mechanisms.

Responsibilities

Translate system and subsystem requirements into test objectives, acceptance criteria, and verification methods
Own development and acceptance testing for flight mechanisms for Castelion’s hypersonic strike missiles
Design and build complex test stands with integrated load actuators and instrumentation
Develop automated test software for instrument control, test sequencing, data logging, and analysis; Python is preferred.
Maintain rigorous configuration control, data management, and test documentation
Improve test infrastructure, automation, and data quality to increase test cadence and learning velocity
Support flight tests and rocket motor static fires as required

Qualification

Bachelor’s degree in Mechanical5+ years of experience developingStrong debuggingWillingness to support extended hoursEnvironmental testingAerospaceFlight testHands-on machiningHands-on rigorAutonomy and ownershipHigh standards for reliabilitySystems-level thinking

Required

Bachelor’s degree in Mechanical, Electrical, Aerospace, or related engineering field
5+ years of experience developing, integrating, or testing mechanical, electromechanical hardware
Experience with test instrumentation and lab equipment (DAQs, oscilloscopes, power supplies, sensors)
Experience with common sensors like load cells, pressure transducers, LVDTs, encoders
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
Comfortable working in fast-moving environments where hardware is the source of truth
Environmental testing: vibration, thermal-vacuum, thermal cycling, shock

Preferred

Aerospace, automotive, defense or other high-reliability hardware testing
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
Hands-on rigor: deep understanding of systems through direct testing and failure analysis.
Autonomy and ownership: you don't wait for direction you seek out what needs to be tested and make it happen.
High standards for reliability, data quality, and test repeatability.
Systems-level thinking: understanding how actuator behavior affects broader vehicle performance.

Company

Castelioncorporation

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Source: greenhouse

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