Mechanical Engineer Intern (Winter/Spring 2027)

Castelion Corporation•Torrance, CA

10d

About The Position

Join Castelion for a dynamic, hands-on experience developing next-generation missile systems. As an intern, you'll contribute directly to the design, testing, and integration of advanced defense technologies all within a fast-paced, collaborative startup environment where your work has immediate impact. 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.

Requirements

Currently pursuing a Bachelor's or Master's degree in Mechanical Engineering, Aerospace Engineering, or a related field.
Rising junior, senior, or graduate-level student preferred.
Strong academic record with relevant coursework in areas such as mechanical design, propulsion, power systems, or related fields
Passion for aerospace, defense technology, and innovative engineering solutions.
Excellent problem-solving, analytical, and communication skills.
Ability to work collaboratively in a fast-paced, team-oriented environment.

Nice To Haves

Hands-on experience through lab work, projects, or internships is a plus.
Experience with hardware design, testing, data acquisition, and analysis.
Familiarity with missile systems, defense technology, or aerospace components.
Strong interest in working in a startup environment with high-impact projects.

Responsibilities

Assist in the design, analysis, and testing of components for missile subsystems, including propulsion, guidance systems, power electronics, and more.
Support engineering teams with simulations, modeling, and prototyping of critical hardware components.
Conduct research and development tasks, gathering and analyzing data to inform design decisions.
Participate in system integration efforts, helping to assemble and test subsystems in real-world test environments.
Collaborate cross-functionally with engineering, manufacturing, and test teams to ensure project success.
Document design processes, test results, and project progress, contributing to the continuous improvement of our systems.
Attend technical reviews, design meetings, and team briefings to stay engaged with project developments and learn from industry experts.