C5I Senior 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 Senior Software Engineer to support the C5I (Command, Control, Communications, Computing, Cyber and Intelligence) product line within the Missile Defense Sensors (MDS) Software Department. Our C5I teams deliver multi‑language, multi‑platform software across Linux services, microservices, REST APIs, Windows front‑end applications, and HTML/TypeScript UIs.

The C5I ecosystem includes development in C++, Java, JavaScript/TypeScript, Lua, C#, and Python, built and deployed through CI/CD pipelines in an Agile DevSecOps environment. This role provides the opportunity to contribute to mission‑critical systems that support the Air Defense Operations Center (ADOC) and broader C5I capabilities.

This position is located onsite in Tewksbury, Massachusetts.

What You Will Do

• Design, develop, integrate, and test software components across C5I applications, including Linux services, microservices, REST APIs, and UI components.

• Contribute to implementation of algorithms and system features that enable mission‑critical functionality.

• Analyze, implement, and validate software modifications to enhance performance, reliability, and maintainability.

• Participate in and occasionally lead software design reviews, code reviews, and technical discussions.

• Perform root‑cause analysis for complex defects, using debugging tools and instrumentation to diagnose performance and functional issues.

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

• Contribute to Agile execution and continuous‑improvement efforts, including refining development standards and documentation.

• Support high‑quality, recurring software deliveries that meet program milestones and customer expectations.

• Mentor and guide junior engineers, fostering a culture of knowledge sharing and technical excellence.

What You Will Learn

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

• Techniques for analyzing and improving complex algorithms and system behaviors.

• Best practices for Agile and DevSecOps pipelines used to build and deliver C5I software.

• Effective collaboration across Systems Engineering, Integration & Test, and Platform engineering teams.

• Leadership skills for guiding junior engineers and contributing to team technical direction.

Qualifications You Must Have

• Typically requires a Bachelor's of Science Degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 5 years of prior relevant experience unless prohibited by local laws/regulations.

• Experience developing software in C++ and/or Java, including Git workflows, code reviews, and Linux/UNIX development environments.

• Experience developing software in an Agile Scrum or Kanban team environment.

• Experience collaborating with cross‑functional engineering teams and contributing to technical problem solving.

• Ability to obtain U.S. government issued Secret security clearance is required after start date. U.S. citizenship is required, as only U.S. citizens are eligi