Principal Mechanical Engineer

Date Posted: 2026-10-05 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.

The Principal Mechanical Engineer is a key technical contributor to the programs and products supported by the department. These activities may include designing Radio Frequency (RF) systems for challenging thermal and high vibration environments. This candidate will lead programs as a Responsible Engineering Authority (REA) or Integrated Product Team Lead (IPTL), and serves as a liaison to programs, ensuring program success along technical, cost and schedule parameters, as well as overseeing junior engineer’s job assignments and performance. This position is 100% remote.

What You Will Do

• Possess working knowledge of electronics packaging design and manufacturing.
• This knowledge set includes, but is not limited to, thermal and structural design and analysis, electrical component design, construction and failure modes, printed wiring board and circuit card assembly processes and best practices, surface mount and through hole component installation processes and failure modes, metal fabrication and finishing methods, RF isolation mechanical design, and environmental test methods and equipment.
• Have working knowledge of electronics/processor systems design and development utilizing COTS/MOTS components and products.
• Provide technical guidance and act as a mentor to his/her matrix team.
• Make technical presentations and establish customer relationships.
• Be a 'self-starter' able to lead by example, possessing strong interpersonal, written and verbal communication skills, and maintain positive relationships and satisfaction with functional and program leadership.

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 with Mechanical Design, Development and/or Implementation of Defense related Electronic Systems.
• Experience with Geometric Dimensioning and Tolerancing (GD&T) and ASME drawing and documentation standards and procedures.
• Experience with solid modeling with a minimum of three years of creating and documenting mechanical designs in Pro/Engineer/CREO or similar modeling tools.

Qualifications We Prefer

• Experience with EW/Radar Systems or RF Products.
• Experience with Conformal Antenna Array Packaging.
• Experience with managing budget and schedule (Earned Value Management (EVM).
• Previous experience with design reviews including preparation of chart decks, generating design artifacts and presenting to customers.
• Experience with electronics packaging, cabling and harness design, or printed wiring board designs and routing.
• Experience with structural and thermal analysis using FEA modeling techniques.
• Experience developing Basis of Estimate (BOEs) for proposals and providing proposal technical volume leadership.
• Proficiency with Parts Management and Materials and Process Engineering COTS / MOTS Design and Development.
• Experience executing root cause analysis and developing effective corrective actions.
• Experience interfacing and communicating with customers (internal/external), regarding assessments of program performance (technical, cost and schedule).

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.

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.

More information about Security Clearances can be found on the US Department of State government website:

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.

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.

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