Structural Dynamics Engineer

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.

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.

As a Structural Dynamics Engineer at Castelion, you will own the structural dynamics methodology used across our missile and aerospace systems. You will develop high-fidelity analytical models, validate them through testing, and provide the engineering insight that drives design decisions from concept through flight. You'll work across structures, propulsion, avionics, flight test, manufacturing, and test engineering to ensure our vehicles survive some of the harshest dynamic environments imaginable.

This role is ideal for someone who enjoys combining analysis with real hardware testing and wants to influence vehicle architecture from day one.

• Develop and continually improve Castelion's structural dynamics and loads analysis methodologies
• Perform modal, random vibration, shock, transient, and frequency response analyses for flight hardware
• Generate structural dynamics models and simulation results that directly influence critical engineering decisions
• Define dynamic test strategies spanning component, subsystem, and full vehicle qualification
• Correlate analytical models with test data and continually improve model fidelity
• Partner closely with design, manufacturing, propulsion, avionics, and flight test teams to optimize hardware performance
• Develop automated analysis tools and workflows to improve engineering efficiency
• Support qualification, acceptance, environmental, and flight testing activities
• Drive technical decisions in a fast-paced, highly collaborative development environment

• Bachelor's degree in Mechanical Engineering, Aerospace Engineering, Structural Engineering, or a related field (or equivalent experience)
• 3+ years of experience performing structural dynamics, loads, or vibration analysis
• Experience with finite element modeling using FEMAP, NASTRAN, or equivalent FEA tools
• Strong experience using MATLAB and/or Python for engineering analysis and data processing
• Experience performing modal, vibration, shock, or transient dynamic analyses
• Strong understanding of structural mechanics, dynamics, and aerospace loads environments

• Master's degree in Mechanical or Aerospace Engineering
• Experience supporting development of missile, launch vehicle, spacecraft, or other aerospace systems
• Experience planning and executing structural dynamics testing including modal surveys and vibration testing
• Experience correlating analytical models with physical test results
• Experience developing custom engineering analysis tools or APIs (FEMAP API, Python, MATLAB, etc.)
• Familiarity with qualification standards including MIL-STD and NASA dynamic testing requirements
• Demonstrated technical leadership through complete product development programs
• Experience working in a rapid hardware development environment

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

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.

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,…