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 and technical excellence are decisive advantages - and we are building a team that can deliver real capability, not just concepts. This is a rare opportunity to join at an early stage, where your work will directly shape critical systems, influence major technical decisions, and have immediate, real-world impact. Structural Dynamics Engineer  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. Responsibilities 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 Basic Qualifications 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 Preferred Skills and Experience 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 …