Senior Principal Mechanical Engineer

Date Posted: 2026-07-29 Country: United States of America Location:

US-CA-REMOTE

Position Role Type: Remote 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. What You Will Do Guide complex tactical systems through the rigorous development and qualification lifecycle with a commitment to continuous improvement through innovation. Conduct pivotal cryocooler trade studies and market down-selections for flagship programs. Construct an objective decision matrix to evaluate SWaP-C (Size, Weight, Power, and Cost) characteristics, thermal capacity curves, and reliability predictions to guide the selection process and secure stakeholder buy-in. Partner to Chief Technologists and Engineering Leadership for strategic road mapping exercises and new business capture. Develop concepts of Opto-Mechanical Assemblies through final part design using 3D Solid Modeling. Perform Design for Manufacturability Trade Studies to optimize fabrication / integration cost reductions. Iterate designs with Structural / Thermal Analysts to optimize survival / reliability requirements. Complete Technical Data Package (TDP) 2D documentation of Solid Model designs and create Initial Releases and perform Revisions of TDP in Product Data Management (PDM) system. Cooperate as an integral member of the Integrated Product Team (IPT) contributing to successful program outcomes under demanding cost and schedule constraints. Duties could include Manufacturing support in a Sustaining / Liaison Engineering role working independently as well as in the context of teams to advise on FPAs, optical systems, or Dewar systems. Define the scope and level of analysis required to meet required objectives and will be held accountable for completing the work within the agreed upon cost and schedule. This responsibility for cost, schedule and technical compliance will also extend to tasks that may be delegated to internal or external analysis support personnel resources. Serving as an organizational spokesperson the selected candidate will act as an advisor to management and customers on critical design decisions. The candidate will be expected to effectively present his/her work in program and department reviews and to provide expert counseling and mentoring to other team members. 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 Mechanical design in the aerospace or commercial industry. Experience developing and implementing new products, processes, standards or operational plans. Experience with low-temperature materials material usage in cryogenic applications. Experience with performing hand calculations based on fundamental equations. Experience with thin structural bonds in assemblies. Experience with thermal testing: planning, organization, execution, data reduction and correlation. Qualifications We Prefer Extensive understanding and experience in wide application of advanced principles, theories, concepts and techniques in structural and/or dynamics analysis resulting in contributions to the development of new theories and/or methods. Team leadership and/or personnel management experience. Extensive knowledge of government, industry and/or academic practices and standards related to mechanical/aerospace. In depth experience in vacuum life analysis and development of vacuum enclosure assemblies. Experience with design of heterogeneous semi-conductor material systems. Highlight working knowledge of cryogenic materials properties via published papers or programs actively engaged as a contributing analyst. Knowledge of commercial CAD software, such as CREO/ProE, Solidworks, or Unigraphics. Ability to read detailed engineering drawings and specifications, including understanding of GD&T. Programming experience in Matlab, Python, C++, or Visual Basic. What We Offer A total rewards package that goes above and beyond with compensation; healthcare, wellness, and work/life benefits; career development and recognition programs. Some of the benefits we offer include parental (including paternal) leave, flexible work schedules, achievement awards, educational assistance and child/adult backup care. Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Trust, Respect, Accountability, Collaboration, Innovation, and Safety. Learn More & Apply Now! 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. This position requires security clearance. DCSA Consolidated Adjudication Services (DCSA CAS), an agency of the Department of Defense, handles and adjudicates the security clearance process. More information about Security Clearances can be found on the US Department of State government website here:

#LI-TR1

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 132,400 USD - 251,600 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