Senior Principal Mechanical Engineer (Onsite)

Date Posted: 2026-07-16 Country: United States of America Location: US-CA-GOLETA-H01 ~ 6380 Hollister Ave ~ BLDG H01 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.

What You Will Do

• Lead mechanical design and development of airborne RF and digital electronics subsystems from concept to production.
• Serve as the mechanical technical authority (REA/IPTL) to ensure alignment with technical, cost, and schedule objectives.
• Communicate technical status and risks to executive leadership; present at internal and customer design reviews.
• Develop requirements, design documentation, trade studies, verification plans, test artifacts, and technical presentations.
• Own subsystem level mechanical solutions capable of meeting demanding thermal, structural, and vibration requirements.
• Collaborate with cross functional teams in Electrical, Systems, Manufacturing, and Supply Chain to deliver integrated hardware.
• Mentor junior engineers and provide technical guidance across the matrixed team.
• Support hardware integration, verification, and production readiness activities within secure program environments.
• Contribute to proposal efforts, including cost estimates and technical volume content.
• Occasional travel (10–20%) to Raytheon facilities, suppliers, or customer sites is expected.

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 or an advanced degree in a related field and minimum 7 years experience.
• Experience in electronics packaging for high reliability environments and in supporting hardware through environmental qualifications (vibration, shock, thermal).
• Working knowledge of electronics/processor systems design and development utilizing COTS/MOTS components and products.
• Experience with GD&T and ASME drawing standards appropriate for production level hardware.
• Experience with 3D solid modeling tools such as Creo/ProEngineer or similar for mechanical design and documentation.

Qualifications: We Prefer

• Experience in leadership in mechanical design and development of defense-related electronic systems, including subsystem lead/REA/IPTL or similar technical authority experience.
• Experience across the full engineering lifecycle: bidding, design, implementation, delivery.
• Experience in earned value management (EVMS) and associated engineering tracking and metrics.
• Background in Electronic Warfare, radar, RF subsystems, or airborne electronics.
• Thermal and structural analysis experience using FEA tools.
• Knowledge of CCA/PCB integration, cabling/harness design, and RF isolation.
• Experience conducting PDR/CDR/TRR reviews and presenting technical data to customers.
• Proposal development experience, including BOEs and technical volumes.
• Experience in root cause analysis and corrective actions within production environments.
• Knowledge of parts management and materials/process engineering.
• Success working in fast-paced, dynamic product development environments.

What We Offer

Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value:

• Safety
• Trust
• Respect
• Accountability
• Collaboration
• Innovation

This position is relocation eligible.

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 onsite work in Goleta, CA: Welcome to Raytheon in Goleta, CA

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 State Department 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 145,600 USD - 276,800 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.

• 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
• 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.

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.