C5I Principal Software Engineer

Date Posted:

2026-03-27

Country:

United States of America

Location:

US-MA-TEWKSBURY-TB1 ~ 50 Apple Hill Dr ~ ASSABET BLDG

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 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.

We are seeking a Principal Software Engineer to support the C5I (Command, Control, Communications, Computing, Cyber and Intelligence) product line within the Missile Defense Sensors (MDS) Software Department. Our teams deliver world‑class software across an ecosystem of technologies and applications, including Linux services, microservices architectures, REST APIs, Windows front‑end applications, and HTML/TypeScript UIs.

C5I applications are implemented using a wide range of languages, including C++, Java, JavaScript/TypeScript, Lua, C#, and Python, and are built and delivered through modern CI/CD pipelines. We operate within Agile and DevSecOps principles, enabling high‑frequency, high‑quality deployments across the value stream.

This position is located onsite in Tewksbury, Massachusetts.

What You Will Do

• Lead the design, development, testing, and deployment of complex software solutions across the C5I software suite, including Linux applications, microservices, REST APIs, Windows front-end applications, and HTML/TypeScript UIs.

• Develop and implement sophisticated algorithms to solve challenging technical problems and optimize performance and functionality in mission-critical systems.

• Analyze, implement, and test software modifications to enhance functionality, performance, and reliability of existing system baselines.

• Determine root cause of failures and engineer corrective solutions using advanced debugging tools.

• Provide critical insight into system‑level design, including hardware/software trade-offs, integration of COTS solutions, software reuse opportunities, and requirements synthesis from system to component level.

• Work closely with Systems Engineering, Integration & Test, and Platform teams to ensure seamless component integration and alignment of requirements.

• Recommend improvements to documentation quality and refine development process standards to enhance team efficiency and alignment.

• Provide technical guidance to the scrum team during planning and execution while mentoring junior and mid‑level engineers.

• Work under general direction, independently developing and determining approaches to complex technical solutions.

What You Will Learn

• How to design, develop, and integrate multi‑language, multi‑platform C5I components spanning services, UIs, and mission-critical applications.

• Advanced techniques for developing and optimizing complex algorithms and evaluating hardware/software trade-offs.

• Cross-functional collaboration strategies with Systems Engineering, Integration & Test, and Platform teams to ensure end‑to‑end capability delivery.

• Agile and DevSecOps best practices supporting high-frequency, high-quality deployment pipelines.

• Leadership and mentorship skills that foster technical growth across teams.

Qualifications You Must Have

• Typically requires a Bachelor’s in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 8 years of prior relevant experience unless prohibited by local laws/regulations.

• Experience as a software developer in C++ and/or Java, including Git workflows, code reviews, unit testing, and development in RedHat/Linux or UNIX environments.

• Exp