C5I Software Engineer II at RTX in Tewksbury, MA

C5I Software Engineer II Location: US-MA-TEWKSBURY-TB1 ~ 50 Apple Hill Dr ~ ASSABET BLDG Date Posted: 2026-04-29 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'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. We are seeking a Software Engineer II to support the C5I (Command, Control, Communications, Computing, Cyber, and Intelligence) product line within the Missile Defense Sensors (MDS) Software Department. The MDS mission is to deliver world-class radar and Command and Control (C2) software for our customers’ wide array of surveillance and warning systems. Our C5I teams work across technologies, including C++, Java, JavaScript/TypeScript, Lua, C#, and Python, delivering Linux services, microservices, REST APIs, Windows front-end applications, and HTML/TypeScript UIs. We operate using Agile and DevSecOps principles, enabling high-frequency, high-quality deployments across the value stream. The ideal candidate has a strong foundation in software development, works well in team environments, and is eager to grow their skills building complex, real-time, mission-critical systems. This position is located onsite in Tewksbury, Massachusetts. What You Will Do Assist with the requirements, design, development, and testing of software features across Linux services, microservices, REST APIs, and UI components. Develop and maintain software in languages such as C++, Java, JavaScript/TypeScript, Lua, C#, and Python as part of a multi-language, full-stack environment. Implement updates and enhancements to existing components to improve performance, maintainability, and reliability. Participate in internal reviews of software components—design reviews, code reviews, and test readiness reviews. Contribute to testing frameworks, unit testing, and CI/CD-driven software integration to enable consistent, high-quality deliveries. Work on tasks with clearly defined scope, schedule, and expectations while following established development processes and coding standards. Collaborate with Systems Engineering, Integration & Test, and other stakeholders to ensure proper integration and alignment. What You Will Learn How C5I applications are designed and developed across multiple languages and platforms, including services and user interfaces. Techniques for debugging, troubleshooting, and resolving software issues in real-time and mission-critical environments. Best practices for Agile execution, Continuous Integration/Continuous Delivery (CI/CD), DevSecOps workflows, and high-frequency delivery pipelines. How to participate in structured software engineering processes, including requirements analysis, design collaboration, code reviews, and testing. How large, complex Command-and-Control and defense systems integrate across multiple engineering disciplines. Qualifications You Must Have Typically requires a Bachelor's of Science Degree in Science, Technology, Engineering, or Mathematics (STEM) and a minimum of 2 years of prior relevant experience unless prohibited by local laws/regulations. Experience with one or more programming languages such as Java, C++, JavaScript/TypeScript, Lua, C#, or Python, with the willingness to learn others. Experience developing software in a team-based Agile environment. Ability to obtain U.S. government-issued Secret security clearance is required after the start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance. Qualifications We Prefer Experience with CI/CD tools (e.g., Jenkins), version control and configuration management tools (e.g., Git, Bitbucket, Artifactory), and scripting or data tools (e.g., Python, MATLAB). Knowledge of data structures, algorithms, memory management, and multithreaded programming. Exposure to C5I/Command-and-Control environments, such as Link16, HMI development, or Mission Defense Planning. Familiarity with large, complex systems like ADOC C5I or NASAMS. Strong communication, documentation, and presentation skills. Ability to work in a fast-paced, dynamic environment with time-critical deadlines. Experience collaborating in teams to develop creative solutions to technical challenges. Interest in continuous learning, cross-team collaboration, and participating in shared training opportunities. Strong communication and collaboration skills. Ability to follow established development processes and work effectively on well-defined tasks. What We Offer Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Safety, Trust, Respect, Accountability, Collaboration, and Innovation. Relocation Eligibility. Learn More & Apply Now! Please consider the following role type definition as you apply for this role. Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products. Candidates will learn more about role type and current site status throughout the recruiting process. For onsite roles, commuting to and from the assigned site is the employee’s personal responsibility. This position requires a security clearance. DCSA Consolidated Adjudication Services (DCSA CAS), an agency of the Department of Defense, handles and adjudicates the security clearance process. More information about Security Clearances can be found on the US Department of State government website here: https://www.state.gov/m/ds/clearances/c10978.htm As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote. The salary range for this role is 68,900 USD - 131,100 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills. Hired applicants may be eligible for benefits, including but not limited to, medical, dental, vision, life insurance, short-term disability, long-term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and holidays. Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective-bargaining agreement. Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective-bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance. This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply. RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window. RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act. Privacy Policy and Terms: Click on this link to read the Policy and Terms