Senior Principal Systems Engineer – Onsite

RTX

Senior Principal Systems Engineer in aerospace and defense leading full lifecycle solutions and mentoring teams. Requires active DoD Secret clearance with onsite roles in Marlborough, MA or Largo, FL.

Posted 5/22/2026full-timeMarlborough • Florida, Massachusetts • 🇺🇸 United StatesSenior💰 $132,400 - $251,600 per yearWebsite

About the role

Key responsibilities & impact

Organize and lead the development of full lifecycle solutions from CONOPS to Validation while collaborating with the customer, subcontractors, and executive leadership
Organize and lead lab activities including setup, configuration management, and testing
Ensure Modeling, Hardware, and Software Interfaces utilize a scalable ontology
Mentor several professionals with varying levels of experience
Own the preparation, cost, and schedule of Design Reviews as well as Integration, Dry Run, and Formal Qualification Testing
Influence decision-makers with recommended courses of action across complex problems
Review and document major changes in systems or processes to solve complex problems

Requirements

What you’ll need

Mastery in tooling to include CAMEO, Rhapsody, Microsoft products, or tasking boards (Jira, IBM EWM, etc.).
Strong integration and test knowledge including digital twins, test procedures, test automation, test execution, and/or test reporting.
Practical experience across the full Systems Engineering V – from CONOPS development to Sustainment.
Knowledge of or application of Earned Value Management System.
Ability to lead multidisciplinary teams of design professionals including electrical, mechanical, software, test, logistics and other system engineers.
Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and minimum 10 years of prior relevant experience or an Advanced Degree in related field and minimum 7 years of experience.
Active and transferable U.S. government issued DoD secret security clearance is required prior to start date.
Must be able to obtain Top Secret clearance.
U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

Benefits

Comp & perks

Medical, dental, and vision insurance
Three weeks of vacation for newly hired employees
Generous 401(k) plan that includes employer matching funds and separate employer retirement contribution, including a Lifetime Income Strategy option
Tuition reimbursement program
Student Loan Repayment Program
Life insurance and disability coverage
Optional coverages you can buy pet insurance, home and auto insurance, additional life and accident insurance, critical illness insurance, group legal, ID theft protection
Birth, adoption, parental leave benefits
Ovia Health, fertility, and family planning
Adoption Assistance
Autism Benefit
Employee Assistance Plan, including up to 10 free counseling sessions
Healthy You Incentives, wellness rewards program
Doctor on Demand, virtual doctor visits
Bright Horizons, child and elder care services
Teladoc Medical Experts, second opinion program
And more!

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

Systems EngineeringIntegrationTest AutomationTest ExecutionTest ReportingEarned Value Management SystemDigital TwinsConfiguration ManagementModeling InterfacesSoftware Interfaces

Soft Skills

LeadershipMentoringCollaborationProblem SolvingInfluencing Decision-MakersOrganizational SkillsCommunication

Certifications

DoD Secret Security ClearanceTop Secret Clearance