Principal Mechanical Engineer
RTX (Raytheon)
- Location
- US-RI-PORTSMOUTH-PS3 ~ 1847 W Main Rd ~ NIMITZ WEST BLDG
- Work model
- On-Site
- Level
- Principal
- Posted
- Aug 20, 2026
About this role
Location: US-RI-PORTSMOUTH-PS3 ~ 1847 W Main Rd ~ NIMITZ WEST BLDG

 Position Role Type: Onsite

 U.S. Citizen, U.S. Person, or Immigration Status Requirements: The ability to obtain and maintain a U.S. government issued security clearance is required. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance

 Security Clearance Type: DoD Clearance: Secret

 Security Clearance Status: Active and existing security clearance required after day 1 At RTX, the world's largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. With our three market leading businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and find new ways to connect and protect our world. Raytheon brings the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. We deliver solutions that help our nation and allies defend freedoms and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense. Raytheon’s Hardware Mechanical Engineering team leads the mechanical hardware design, development and production of critical defense systems. The HWE Team uses state-of-the-art tools, processes, technology, and Raytheon’s CORE principles. HWE’s capabilities encompass a broad range of technical disciplines which include engineering, manufacturing, technical services, materials, processes, analysis, test, and documentation. The ideal candidate for Principal Mechanical Design Engineer will bring a blend of technical ability, experience in mechanical hardware design, system integration skills, and a strong background in program execution whether design and development or production support. As a key contributor on a mechanical or cross-functional engineering team, you will take responsibility for component and assembly modeling, documentation, design changes, and releases processes. This position is ideal for a mid-career mechanical engineer who is looking to grow their skills in design, manufacturing, and technical problem-solving within a highly collaborative and mission-focused environment.
What You Will Do
Design: Developing innovative technical solutions to a wide range of complex challenges spanning the entire product lifecycle, including proposal, advanced development, design, cooling, manufacturing, integration, and testing of radars, support equipment and electronics for military programs. Perform tolerance analyses to ensure form, fit, and function are as intended by design for the use-application. Lead small teams utilizing strong mechanical hardware design experience and knowledge in a fast-paced collaborative environment with ruggedized structures, interconnects, cooling, electronics packaging, tooling and/or array integration. Provide support for product integration and efforts in both domestic and international factories and supplier locations to assess requirements compliance. Teaming/Communication: Collaborate with cross-functional teams including other engineering disciplines, operations, supply chain, quality, and external suppliers to resolve technical challenges and develop effective design solutions. Independently manage tasks and deliver on schedule, budget, and technical goals. Participate in design reviews and conduct trade studies to support informed, sound engineering decisions. Mentor and guide less experienced engineers, contributing to team development and technical growth.
Qualifications
You Must Have Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 8 years