Principal Systems Engineer - Onsite Cambridge MA
RTX (Raytheon)
- Location
- US-MA-CAMBRIDGE-555-CUST ~ 555 Technology Sq ~ TECHNOLOGY (External Site)
- Work model
- On-Site
- Level
- Principal
- Posted
- Sep 8, 2026
About this role
Location: US-MA-CAMBRIDGE-555-CUST ~ 555 Technology Sq ~ TECHNOLOGY (External Site)

 Position Role Type: Onsite

 U.S. Citizen, U.S. Person, or Immigration Status Requirements: Active and transferable U.S. government issued security clearance is required prior to start date. 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 on 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 freedoms and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense. Principal Systems Engineer – Onsite Cambridge MA About Us At Raytheon, the foundation of everything we do is rooted in our values and a higher calling – to help our nation and allies defend freedoms and deter aggression. We bring 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. Our team solves tough, meaningful problems that create a safer, more secure world. Are you passionate about turning innovative concepts into reality? Do you thrive in dynamic environments? Raytheon is seeking a talented and motivated Principal Systems Engineer to join our team within the Systems Engineering and Test Capabilities (SETC) Discipline, supporting development of complex inertial guidance systems for space and military applications. Every day will bring new challenges, requiring you to collaborate across disciplines to troubleshoot issues, perform data analysis, and implement solutions. Your contributions will directly impact the success of mission-critical defense systems, and you'll have a hands-on role in ensuring the entire system functions seamlessly. This role is based ~100% onsite at a customer facility in Cambridge, MA.
What you will do
In this Systems Engineer role, you will perform and/or support the following activities: Core Systems Engineering: Develop requirements and algorithms, concepts of operations, system trades, and system interfaces Model Based Systems Engineering (MBSE): Develop and maintain detailed SysML descriptive system models, linking and synchronization of requirements, and generate design documentation / views Interface with cross functional teams, such as Electrical and Software engineering, to help guide subsystem development and ensure compliance with requirements throughout the entire product lifecycle Frequent interface with Customer and other program stakeholders and collaborators Conduct and/or support technical peer reviews and provide constructive feedback; Document and provide technical guidance to other members of the design team Communicate technical topics and issues in a clear and concise manner to both technical peers and non-technical team members Qualifications You Must Have: Typically requires a Bachelor’s in Science, Technology, Engineering, or Mathematics (STEM) and a minimum of 8 years of prior engineering experience. Experience with systems requirements, systems software, and systems hardware; experience with systems integration and/or systems test is a plus