Principal Mechanical Engineer, Design

Principal Mechanical Engineer

This position is for a Principal Mechanical Engineer within the Mechanical Design organization. The role supports the full lifecycle of hardware development—from initial design through production and fielding—across multiple product lines and customer communities.

The Mechanical Design organization within Raytheon Hardware Engineering supports the development, production, and deployment of a broad range of defense and aerospace products. These include systems used by both U.S. Government and international customers across land, air, and maritime domains.

This position will support programs based in Tucson, AZ, and may require domestic and international travel to suppliers, Raytheon facilities, and customer sites. This is an onsite role.

What You Will Do

• Perform mechanical design, development, and documentation of components, sub-assemblies, and major end items in accordance with system requirements.
• Lead and mentor mechanical engineering teams while meeting schedule, financial, and technical objectives.
• Collaborate with structural/thermal analysts, materials engineering, quality, safety, supply chain, operations, and program leadership to develop and refine design solutions.
• Support factories and suppliers with product development, integration, troubleshooting, and obsolescence management, domestically and internationally.
• Conduct trade studies, participate in design peer reviews, and resolve technical action items.
• Apply thermal, structural, dynamic, and reliability analysis results to improve mechanical designs.
• Apply Geometric Dimensioning and Tolerancing (GD&T) principles, including performing and reviewing tolerance analyses to ensure proper form, fit, and function.
• Improve designs using DFMA and producibility principles.
• Develop and maintain the technical data package (TDP), ensuring capabilities and requirements compliance.
• Serve as responsible engineer or subsystem lead, directing and reviewing work from team members with limited supervision.
• Utilize Raytheon hardware tools, processes, and standards across all phases of development.
• Support First Article Inspection (FAI) and Raytheon Source Inspection (RSI) in partnership with Quality Engineering.
• Contribute to one or more of our contract-funded and internal research projects at varying stages of proposal, design, and integration/test.

Qualifications You Must Have

• Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 8 years of prior relevant experience or an Advanced Degree in a related field and minimum 5 years experience.
• Experience in technical leadership across the mechanical product development lifecycle, including requirements development, trade studies, design, integration, and/or test.
• Experience working across multiple functional and discipline areas to resolve technical challenges and drive development of mechanical components and/or subsystems.
• Experience creating, releasing, and/or updating mechanical technical data packages and interpreting technical documentation in a production environment.
• Experience with CREO (or equivalent CAD tools).
• Experience with the application of Geometric Dimensioning and Tolerancing (GD&T), including basic tolerance analyses and drawing interpretation.

Qualifications We Prefer

• Advanced degree in mechanical, manufacturing, or hardware systems engineering.
• Experience supporting development and production programs for military/aerospace mechanical products, including factory support for full-rate production.
• Working knowledge of military and commercial specifications.
• Experience collaborating with suppliers developing mechanical products, machined parts, and electronics.
• Proficient in 3D CAD modeling and drawing (CREO or equivalent) and experienced with Windchill or similar product data management tools.
• Strong understanding and application of Geometric Dimensioning & Tolerancing (GD&T) per ANSI Y14.5.
• Experience in mechanical subsystem packaging, materials, thermal/structural analysis, energetics principles, control systems, interconnect, airframe, or large assembly development.
• Ability to work both independently and collaboratively; demonstrates initiative, flexibility, strong communication skills, and effective technical leadership.
• Willingness to support tasks across design development and production.
• Ability to travel to government and supplier facilities in support of program activities.