C

Castelion

Designs and manufactures hypersonic strike weapons

Propulsion Engineer Intern

PropulsionPosted on Nov 11
Internship · Summer 2027Torrance, CA, USANo salary listedIn-person

About the Job

Requirements

  • Currently pursuing a Bachelor's or Master's degree in Mechanical Engineering, Aerospace Engineering, or a related field.
  • Be a rising junior, senior, or graduate-level student.
  • Have a strong academic record with relevant coursework in mechanical design, propulsion, power systems, or related fields.
  • Have hands-on experience through lab work, projects, or internships; this is listed as a plus.
  • Possess problem-solving, analytical, and communication skills.
  • Be able to work collaboratively in a fast-paced, team-oriented environment.

Responsibilities

  • Gain hands-on experience in aerospace engineering while working on hypersonic missile systems.
  • Develop technical skills by working with high-performance teams and state-of-the-art tools.
  • Learn about the full lifecycle of missile development, from design and prototyping to testing and final integration.
  • Receive mentorship from experienced engineers and leaders in the aerospace and defense industry.
  • Contribute to the design, testing, and integration of advanced defense technologies.

Desired Qualifications

  • Passion for aerospace, defense technology, and innovative engineering solutions.

About the Company

Castelion

Designs and manufactures hypersonic strike weapons

Castelion designs, tests, and manufactures hypersonic strike weapons for the U.S. military, aiming to deter future wars with fast, credible, non-nuclear deterrence. Its flagship Blackbeard is a low-cost, mass-producible hypersonic missile compatible with HIMARS/MLRS, built in-house with solid rocket motors, propellant, and a real-time, hardware-isolated flight computer. The company uses vertical integration and a rapid test-and-iterate cycle, with frequent flight tests and Project Ranger, a 1,000-acre facility in New Mexico to scale production. It competes with traditional defense primes on speed and cost, selling under government contracts and development awards to field advanced weapons at scale.

Company size
201-500
Company stage
Series C
Total funding
$1.5B
Headquarters
Torrance, CA
Founded
2022

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