Sr Principal Mechanical Engineer Lead

Senior Principal Mechanical Engineer

Location: MA131:
Tewksbury, MA Bldg 1 Assabet 50 Apple Hill Drive Assabet - Building 1, Tewksbury, MA, 01876 USA

Position Type: Onsite

Security Clearance: Secret – U.S. citizenship required for security clearance and U.S. passport requirement.

• Lead execution of major programs within the department, including shelter mechanical design, electronic equipment integration, end-item development, vendor coordination, and integration of power and cooling systems.
• Support and lead cross‑functional engineering teams, delivering solutions across all phases of the program lifecycle, including next‑generation sensing technologies and production transition.
• Lead and contribute to proposal efforts and Estimate at Completion (EAC) activities, providing strategic and technical input.
• Serve as a Subject Matter Expert across multiple programs, ensuring successful execution and delivery.
• Act as a technical liaison to programs and Integrated Product Teams (IPTs), ensuring stakeholder alignment.
• Oversee technical performance of the design team, providing engineering guidance throughout the product lifecycle.
• Support and lead Technical Data Package (TDP) development and conduct thorough peer reviews.
• Lead mid‑to‑large‑sized cross‑functional engineering teams, driving technical execution from proposal generation through first‑article production.
• Perform complex mechanical design of components, subassemblies, and major end items for defense system applications, ensuring compliance with requirements.
• Provide product integration support for domestic and international factories and suppliers.
• Manage and meet schedule, cost, and technical performance commitments for assigned tasks and projects.
• Apply deep knowledge of hardware engineering best practices to maintain technical excellence.

• 10+ years in a Mechanical Engineering role focused on design and development of mechanical equipment, preferably in military or defense environments.
• Bachelor of Science in Mechanical Engineering or related field.
• Experience leading engineering teams with accountability for cost, schedule, and technical performance; project management experience with budgeting and scheduling.
• Proven ability to work in an IPT environment across engineering disciplines and with Operations, Supply Chain, Quality, Program Management, and customers.
• Hands‑on mechanical design experience, including:
  • Performing trade studies
  • Developing concepts through detailed design
  • Supporting transition to production
  • Providing ongoing production and supplier support
• Experience conducting Root Cause and Corrective Action (RCCA) analyses, driving cost‑reduction initiatives, and producing engineering white papers or technical documentation.
• Broad expertise in mechanical design, development, material selection, and manufacturing processes; proficiency in CAD tools and PDM systems.
• Willingness and ability to travel domestically and internationally as required.
• A U.S. government‑issued security clearance and U.S. passport are required.

• Master of Science in Mechanical Engineering.
• Knowledge of military and commercial specifications and standards.
• Hands‑on experience in design, fabrication, and integration of:
  • Electronic assemblies including Circuit Cards
  • Power distribution equipment
  • Interconnects, cables, and harness systems
• Strong analytical and advanced problem‑solving skills.
• Ability to work effectively with cross‑functional teams; minimal conflict and strong collaboration skills.
• Adaptability and flexibility to take on diverse, evolving assignments.
• Proven team‑leadership experience, including motivating and monitoring performance of multi‑disciplinary technical teams.
• Experience managing engineering budgets with Earned Value Management Systems (EVMS) and the EAC process.
• Prior experience leading or contributing to proposal development.

Salary range: USD 124,000 – 250,000. Benefits include medical, dental, vision, life insurance, short‑term and long‑term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, parental leave, paid time off, and holidays.

Applicants may be asked to attend select interview steps in person at a Raytheon office. Application window closes approximately 40 days after posting.

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. RTX provides affirmative action 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.