Senior C/C++ Software Development Engineer

Date posted: 2026-09-16. Location: Tewksbury, Massachusetts (US-MA-TEWKSBURY-TB3 ~ 50 Apple Hill Dr ~ CONCORD BLDG, Tewksbury Tb3 300 Concord).

About the role

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 three market‑leading businesses, world‑class operations, and investments in research and development, RTX offers 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 more than 100 years of experience and renowned engineering expertise to meet today’s mission and stay ahead of tomorrow’s threat, delivering solutions that help our nation and allies defend freedoms and deter aggression, creating a safer, more secure world. We are seeking a skilled and detail‑oriented Senior Software Engineer to develop complex systems in C/C++ as part of our Patriot Software Team in Tewksbury, Massachusetts. Patriot is the world's pre‑eminent air defense system, and we are currently developing software in support of new system capabilities. You will work closely with software developers, system architects, and product leads to ensure that the solutions we deliver meet our customers’ requirements, in a dynamic, fast‑paced environment where your contributions have a direct impact on the success of our products worldwide.

Responsibilities

• Design, develop, and maintain software applications using C and C++ for complex real‑time systems and applications.
• Collaborate with cross‑functional teams to define, design, and implement new features, ensuring system integration and scalability.
• Troubleshoot, debug, and optimize existing code for performance and efficiency in complex environments.
• Write and maintain comprehensive documentation for software applications, including system architecture and design specifications.
• Participate in code reviews and ensure adherence to coding standards and best practices.
• Stay current with industry trends and advancements in C/C++ technologies, especially in relation to complex systems.
• Light travel and off‑hours testing (2nd or 3rd shift) may occasionally be required.
• This position requires exclusive onsite presence.

Requirements

• Typically requires a 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 in developing complex systems and applications using C/C++.
• Experience in embedded systems, real‑time systems, or large‑scale applications.
• Experience in a Unix/Linux operating system.
• U.S. citizenship is required (only U.S. citizens are eligible for a security clearance).
• Active and transferable U.S. government issued security clearance is required prior to start date.
• Ability to obtain an INTERIM U.S. government issued security clearance is required prior to start date.
• Security clearance type: DoD Clearance: Secret.

Qualifications

• Active Secret security clearance (preferred).
• Understanding of data structures, algorithms, and software design principles, particularly in high‑concurrency and distributed systems.
• Experience with multithreading, memory management, and performance optimization in complex environments.
• Experience with network communication protocols, shell scripting (tcsh, csh, bash), software development tools like Git/Clearcase, software debuggers, and using embedded RTOSs (e.g., VxWorks, Integrity).
• Experience with version control systems (e.g., Git).
• Experience with software development methodologies (Agile, Scrum, etc.).

Benefits

• Medical, dental, vision, life insurance, short‑term disability, long‑term disability, 401(k)