Senior Principal Mechanical Engineer
RTX (Raytheon)
- Location
- US MA MARLBOROUGH MA1 1001 Boston Post Rd BLDG 1
- Work model
- On-Site
- Level
- Principal
- Posted
- Sep 11, 2026
About this role
Location: US-MA-MARLBOROUGH-MA1 ~ 1001 Boston Post Rd ~ BLDG 1

 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 freedom and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense. The Radar Mechanical Design Department leads mechanical design, development, and integration of some of the most innovative land-based and shipboard radars in the world. This includes phased array radar systems, electronic modules, pedestals, and power and cooling systems. The department comprises individuals with technical expertise and experience in hardware design, integration, and production support. Mechanical Engineering is searching for an experienced Senior Principal Design Engineer to work in the Radar Design Department. This onsite role will be based in Marlborough, MA or Tewksbury, MA.
What You Will Do
Develop sound technical solutions to a wide range of complex problems related to the entire product life cycle. Program support and development from early development through transition to production. Lead the mechanical development of radar systems and components that achieve the performance requirements at the system-level. Provide technical conscience, challenged with making sure the product and process meet appropriate standards and requirements. Ensure balance with risk conditions and constraints while advising leadership. Visible and accountable for technical decisions. Frequent technical contact with the customer and senior personnel inclusive of requirements, significant technical commitments, IRAD, future technical needs, etc. Maintain responsibility for meeting cost, schedule, quality, and performance requirements for the finished product. Work with minimal direction or supervision, while exercising considerable latitude in determining the technical objectives of the assignment. Utilize effective communication with all levels of a program and customer. Periodic travel will be required to support collaboration, and hardware build and test.
Qualifications
You Must Have Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 10 years of prior relevant experience. Experience in the design of mechanical design for military or aerospace or commercial applications. Experience with phase array structures, and/or hardware packaging, and/or array integration for military or mechanical or commercial applications in a collaborative environment.
Qualifications
We Value Experience with ANSI drawing standards and/or first order or structural analysis techniques. Experience in Metrology. Experience in ruggedized or military integration. Experience with CREO(Pro/E) or similar 3D solid modeling software. Familiarity with the design and manufacturing processes of CCAs, metal housing, sheet metal, or