Principal Mechanical Engineer, Design

Date Posted: 2026-07-14 Country: United States of America Location: US-AZ-TUCSON-807 ~ 1151 E Hermans Rd ~ BLDG 807 Position Role Type: Onsite U.S. Citizen, U.S. Person, or Immigration Status Requirements: Active and transferable U.S. government issued security clearance is required prior to start date. 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: Ability to obtain INTERIM U.S. government issued security clearance is required prior to start date 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. At Raytheon, the foundation of everything we do is rooted in our values and in a higher calling—supporting our nation and allies as they defend freedoms and deter aggression. Backed by more than a century of engineering leadership, our teams tackle meaningful, complex challenges that contribute to a safer, more secure world. 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. Learn More & Apply Now! Please consider the following role type definition as you apply for this role. Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products. Location Information: This position is onsite at our campus in beautiful Tucson, AZ. Tucson has a friendly, caring, and laid-back atmosphere, combined with the innovation and energy of a metropolitan region, and recognized as one of America’s 10 Best Small Cities. Surrounded by beautiful mountains, colorful Sonoran Desert landscape and majestic saguaro cacti, Tucson is blessed with some of nature’s best work. Tucson is known for its bright blue skies, and with more than 310 sunny days per year, Tucson’s fantastic weather lets residents enjoy the outdoors year-round. Virtual Fly Over City of Tucson & Community, YouTube Video Links “Raytheon In Tucson”: “Tucson is Awesome”: “Winter in Tucson”: As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote. The salary range for this role is 107,500 USD - 204,500 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills. Hired applicants may be eligible for benefits, including but not limited to, medical, dental, vision, life insurance, short-term disability, long-term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and holidays. Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective-bargaining agreement. Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective-bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance. This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply. RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window. RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act. Privacy Policy and Terms: Click on this link to read the Policy and Terms RTX is an aerospace and defense company that provides advanced systems and services for commercial, military and government customers worldwide. It comprises three industry-leading businesses – Collins Aerospace, Pratt & Whitney, and Raytheon. Its 195,000 employees enable the company to operate at the edge of known science as they imagine and deliver solutions that push the boundaries in quantum physics, electric propulsion, directed energy, hypersonics, avionics and cybersecurity. The company, formed in 2020 through the combination of Raytheon Company and the United Technologies Corporation aerospace businesses, is headquartered in Arlington, Virginia.