Test Specialist – Environmental Lab

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.  

Test Specialist – Environmental Lab 

We are seeking a hands-on Test Specialist – Environmental Lab to support the development, qualification, acceptance, and production testing of flight hardware. This role will operate in a fast-paced test environment where careful preparation, disciplined execution, and rapid problem-solving are essential to delivering reliable flight and mission systems. 

The Test Specialist – Environmental Lab will work directly with test engineers, design engineers, technicians, manufacturing personnel, and quality teams to configure and execute vibration, shock, and modal tests. The ideal candidate is comfortable working with complex test equipment, mechanical fixtures, instrumentation, and data acquisition systems—and is motivated by solving difficult problems with limited precedent. 

Responsibilities  

• Perform acceptance test procedures and qualification test procedures on aerospace and defense hardware.
• Program and operate electrodynamic shakers, vibration controllers, shock systems, modal test equipment, and associated data acquisition systems.
• Execute sine, random vibration, sine burst, shock, modal survey, resonance search, and other dynamic test profiles.
• Verify test article configuration, fixture interfaces, sensor orientation, cable routing, calibration status, and test setup documentation.
• Monitor test execution in real time, including control response, cross-axis motion, fixture behavior, response limits, and abort criteria.
• Review time histories, frequency spectra, power spectral density plots, transmissibility, and frequency-response data for anomalies.
• Maintain complete and accurate test records, including setup photographs, calibration data, channel lists, configuration data, deviations, and results.
• Participate in 5S, safety, tooling, process-improvement, and laboratory-efficiency initiatives.
• Maintain a clean, organized, and safe test area in accordance with company and facility requirements.
• Work closely with cross-functional teams to meet demanding test schedules and program milestones. 

Basic Qualifications  

• High school diploma or equivalent.
• Two or more years of experience in aerospace, defense, aviation, automotive, manufacturing, laboratory testing, or a related technical environment.
• Hands-on experience operating test equipment, mechanical systems, instrumentation, or data acquisition systems.
• Ability to read engineering drawings, work instructions, schematics, test procedures, and equipment documentation.
• Ability to use common hand tools and calibrated torque tools.
• Strong attention to detail and commitment to following approved procedures.
• Ability to troubleshoot problems systematically and communicate findings clearly.
• Ability to work effectively in a team-based, schedule-driven environment.
• Ability to lift, handle, and position test hardware and equipment in accordance with applicable safety procedures.
• Knowledge of and ability to use PPE, when required. 

Preferred Skills and Experience  

• Aerospace, automotive, defense or other high-reliability hardware testing
• Environmental testing: MIL-STD-810H tests including vibration, thermal-vacuum, thermal cycling, shock, salt fog, and sand and dust 
• Experience using accelerometers, strain gauges, load cells, force transducers, thermocouples and signal-conditioning equipment.
• Ability to identify process improvements, and make suggestions to engineers to improve workflow
• Familiarity of acceptance, qualification and development test campaigns.
• Familiarity with requirements verification, qualification evidence, and failure tracking
• Familiarity with vibration control and data acquisition platforms such as Vibration Research, Data Physics, LDS, Unholtz-Dickie, NI, Dewesoft, 

Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.  

Other Duties

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice. 

Additional Eligibility Requirements

This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply. 

Affirmative Action/EEO Statement

Castelion is an Equal Opportunity Employer. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by applicable federal, state, or local law. 

Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact hr@castelion.com. Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law. 

Castelion is committed to fostering a workplace where employment decisions are based on qualifications, business needs, and the ability to perform the essential functions of the role, with or without reasonable accommodation. 

EAR/ITAR Requirements

This position requires access to export-controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export-controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.