Senior Mechanical Design Engineer

Senior Mechanical Design Engineer (RF Systems & Radomes)Rio Rancho, New Mexico, United StatesCastelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus and technical excellence are decisive advantages - and we are building a team that can deliver real capability, not...

Senior Mechanical Design Engineer (RF Systems & Radomes) Rio Rancho, United States | Posted on 08/06/2026 Castelion was founded to restore America’s ability to field advanced weapons at speed and scale. Inspired by the engineering urgency of the WWII and Apollo eras, we combine rapid iteration, vertical integration, and scalable manufacturing to deliver...

Castelion is seeking a Senior Avionics Test Engineer to architect and execute the full set of hardware tests, moving avionics from prototype to production. You will own test requirements, develop automated test equipment, and validate performance across power electronics, RF, and digital interfaces. You will design fixtures, build test stations, support DVT...

Why Castelion, Why NowCastelion 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.Castelion is moving incredibly fast

Next Matter in Rio Rancho, NM is seeking a Senior Thermal & TPS Integration Engineer to design and deliver thermal protection solutions for hypersonic strike vehicles. You'll lead multidisciplinary engineering efforts in a fast-paced environment. Key qualifications include a degree in Aerospace or Mechanical Engineering, 5+ years of TPS experience, and...

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. Why Castelion, Why Now Castelion is moving incredibly...

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...

Senior Manufacturing Engineer - Warhead Integration & Test 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...

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...