Senior Integration & Test Engineer (US)

We are looking for a Senior Integration & Test Engineer with 5+ years of experience to own the end-to-end integration and verification of hypersonic strike vehicles as Castelion prepares to deliver its first 50 Blackbeard units to the U.S. Navy. This is an incredibly cross-functional engineering role, you'll be embedded in the build process from day one, ensuring every subsystem is properly validated before handoff to the customer. You need to be someone with deep systems-level understanding, strong foresight to anticipate integration issues before they arise, and the ability to work across mechanical, electrical, and software domains. The ideal candidate comes from a high-complexity, high-stakes environment, think first-build programs, pilot builds, or new product development where engineering standards are non-negotiable. You'll also mentor a junior integration engineer and help build out the I&T function as Castelion scales production.

What will you be doing?

• Leading vehicle-level integration activities, ensuring form, fit, and function across all subsystems (warheads, propulsion, avionics, structures) as units move through production

• Developing and executing integration & test strategies that catch issues during the build process, not after, acting as the quality gatekeeper before customer delivery

• Writing and running test automation scripts (Python, LabVIEW) for environmental testing including vibration, thermal, and vacuum chamber validation

• Designing integration tooling and fixtures for safe handling and assembly of energetic and complex mechanical systems

• Mentoring a junior integration & test engineer and building out the I&T team to support production scale-up across Torrance and Rio Rancho facilities