Senior Mechanical Design Engineer

About the job Senior Mechanical Design Engineer

About Castelion

Castelion is bringing a new approach to defense development and production : one that focuses on short, iterative design cycles, rapid testing in development, and modern commercial manufacturing strategies for production at scale. Were designing, building, and testing next generation long range strike weapons systems to give America and its Allies a definitive edge and deter future conflicts.

Senior Mechanical Design Engineer

Castelion is seeking a high output Senior Mechanical Design Engineer with a full stack, Responsible Engineer mindset and experience shipping flight hardware. This person will be responsible for critical flight structures and mechanism design and build efforts for Castelion's hypersonic vehicles. The Senior Mechanical Design Engineer will work closely with a fast-moving team of peers and engineering leadership to ensure mission-critical hardware is delivered on time and meets demanding technical performance. A successful candidate will have significant experience delivering high-performance, mass-constrained hardware in a rapid development environment.

Responsibilities

• Design and Deliver Mission-Critical Hardware : Lead the design, build, and integration of key flight vehicle components such as composite tanks, separation mechanisms, actuators, and control surfaces. Own your systems from concept to flight. Apply fundamentals in statics, dynamics, and modal analysis to justify designs and prove them in test and flight.
• Drive High-Cadence Design Iteration : Support iterative prototyping cycles every four weeks for key subsystems. Engage in cross-functional design reviews, integrate test feedback rapidly, and evolve hardware through fast-paced learning loops.
• Build and Maintain Engineering Rigor : Contribute to the development of engineering best practices at Castelion, including CAD standards, documentation practices, and hardware management protocols. Write build documentation and collaborate hands-on with technicians during integration and assembly.

Basic Qualifications

Leadership Qualities

ITAR Requirements

Employment with Castelion is governed on the basis of competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin / ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

All employees are granted long-term stock incentivesas part of their employment at Castelion. All employees receive access tocomprehensive medical, vision, and dental insurance, and the company offersfour weeks of paid time off per year.