Structural Analysis 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. 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. Structural Analyst We're looking for a Structural Analysis Engineer to help design and validate next-generation hypersonic defense systems. You'll work in a fast-moving startup environment where analysis directly informs design decisions, hardware builds, and flight readiness. This role offers high ownership, close collaboration with design and test teams, and the opportunity to see your work rapidly turn into flying hardware. Responsibilities • Perform structural analysis of aerospace components and assemblies under static, dynamic, thermal, and fatigue loading. • Use hand calculations and finite element models to support rapid design iteration. • Work closely with design engineers to influence geometry, materials, and load paths early in the design process. • Correlate analysis with test data and support structural testing and qualification efforts. • Exemplify technical excellence and be accountable for your work • Communicate technical content in an efficient and effective manner to partner teams Basic Qualifications • Bachelor's degree in Aerospace Engineering, Mechanical Engineering, or a related field. • Strong understanding of structural analysis, structural dynamics, and aerospace materials. • Experience with FEA tools such as Abaqus, NASTRAN, or similar solvers. • Comfortable working in ambiguous, rapidly evolving technical environments. Preferred Skills and Experience • Master's degree in Aerospace or Mechanical Engineering. • Experience with launch vehicles, spacecraft, aircraft, UAVs, or propulsion systems. • Knowledge of fatigue, fracture mechanics, buckling, or thermal-structural analysis. • Familiarity with aerospace standards and certification processes (e.g., FAA, NASA, MIL). • Scripting or programming experience (Python, MATLAB) to automate analysis workflows. • Experience supporting hardware testing or flight operations 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.