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Date Posted: 2026-03-05 Country: United States of America Location: US-RI-PORTSMOUTH-PS1 1847 W Main Rd NIMITZ BLDG 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 We are looking for an experienced Principal Software Engineer to join our Radar Digital Product Line team and contribute to high-performance application development. If you are passionate about developing innovative software solutions and thrive in a collaborative environment, this opportunity is for you! What You'll Be Responsible For: • Developing robust and scalable software in C++ on Linux or UNIX platforms using Agile methodologies. • Designing, implementing, testing, and maintaining radar software applications, ensuring optimal system integration and scalability. • Creating and updating MATLAB scripts to validate software requirements. • Solving complex challenges and delivering results on schedule. • Participating in design, code, and test reviews, ensuring adherence to coding standards and best practices. • Keeping up-to-date with industry trends and advancements in C/C++ technologies, especially related to complex systems and continuous delivery. Qualifications Required: • A bachelor's degree in Science, Technology, Engineering, or Mathematics (STEM) with a minimum of 8 years of applicable experience. • Valid and transferable U.S. government issued Secret security clearance prior to start date. • Proven experience in software design, integration, and testing using C/C++ in a real-time, multi-threaded development environment. • Proficiency in Unix/Linux operating systems. Qualifications Preferred: • Experience with multithreading, memory management, or performance optimization in complex settings. • Knowledge of data structures, algorithms, and software design principles, particularly for high-concurrency and distributed systems. • Familiarity with software development methodologies like Agile and Scrum. • Experience in a Department of Defense (DoD) software development environment. • Proficiency in Network Communication Protocols, Shell Scripting (ksh, csh, bash, Perl), and tools like Git/Clearcase, GDB, and text editors (vi/Gvim/Emacs), along with MATLAB. • Demonstrated experience in leading small projects. • Ability to provide technical guidance and mentorship to junior engineers. What We Offer: At RTX, we are committed to a vision of a safer, more connected world. We value Safety, Trust, Respect, Accountability, Collaboration, and Innovation. If you join us, you will have the opportunity to contribute to exciting projects that matter. This position requires security clearance and participation in the interview process may include in-person steps at our office. The salary range for this role is between 107,500 USD and 204,500 USD, reflective of experience levels and qualifications. Benefits offered may include medical, dental, vision, life insurance, retirement plans, and paid time off, among others. RTX is an Equal Opportunity Employer. Qualified applicants will receive consideration without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, or veteran status. We actively support individuals with disabilities and protected veterans in compliance with applicable laws. job perk: Posted At: 6 days ago, job perk: Schedule Type: Full-time, job perk: Dental Coverage: True, job perk: Paid Time Off: True, job perk: Health Insurance: True