Principal Software Engineer

The Real-time Architectures, Integration, and Demonstration (RAID) Group focuses on transition of algorithms from concept to real-time software, providing open architecture expertise, and facilitating integration of capabilities for experimentation, test, and deployment. The Role: As a Principal Software Engineer you will provide technical leadership for the development, integration, and validation of real-time RF sensor software systems. You will work as part of a multi-disciplinary team to architect, guide, and implement software components, integrate algorithms into open architecture frameworks, and develop test infrastructure to validate system performance. This role emphasizes hands-on software development, open system integration, integrating software components across distributed architectures and with hardware platforms, and rigorous testing of real-time applications. You will establish integration and test approaches, identify and mitigate technical risks, mentor engineers, and collaborate with program leadership and government customers to ensure successful delivery of mission-critical capabilities. What you will do: Lead the technical design, development, integration, and validation of real-time sensor systems in C/C++ Integrate signal processing algorithms into open architecture software frameworks Define, develop, and execute integration tests and system-level validation tests Debug software issues in real-time, multi-threaded, and distributed systems Lead the transition of algorithm specifications and MATLAB/Python prototypes into optimized production C/C++ implementations Document software designs, test procedures, results, and technical reports as well as integration plans, technical briefings, and customer-facing presentations Support system demonstrations and field-testing activities Establish and promote best practices for software quality, configuration management, test automation, documentation, and technical risk management Mentor and provide technical guidance to junior and mid-level engineers Interface with government sponsors, customers, program managers, and technical stakeholders to define requirements, communicate technical status, and present results Lead or substantially contribute to proposal development, including technical approach development, work‑breakdown planning, technical writing, cost estimation, white papers, and customer presentations Contribute to the design and implementation of user interfaces, dashboards, and visualization tools that support system observability, test execution, data analysis, and integration workflows Support approximately 10% travel for integration events, field testing, and customer demonstrations Who you are: Active clearance at the Secret level with ability to obtain and maintain a Top Secret security clearance, for which U.S. citizenship is a government requirement BS, MS, or PhD in Computer Science, Computer Engineering, Electrical Engineering, or a related field with relevant experience depending on degree (BS + 12 years, MS + 10 years, or PhD + 5 years) Ten or more years of professional software development experience, including demonstrated experience leading complex software development, integration, and test efforts Expert-level proficiency in programming for high-performance, real-time applications Experience with version control systems (Git) Experience with Linux Strong debugging and troubleshooting skills Demonstrated experience developing or integrating real-time software for signal-processing, embedded, distributed, or hardware-connected systems Demonstrated technical leadership and mentoring experience Experience leading or substantially contributing to proposal efforts, including technical writing, technical‑approach development, cost estimation, and customer presentations Even Better: Active Top Secret clearance (TS/SCI preferred) Strong written, verbal, and presentation skills, including the ability to communicate technical concepts to engineers, program leadership, and government customers Proficiency in Python or MATLAB Experience with hands‑on hardware testing and lab equipment Experience in signal processing and RF sensor‑system architectures Experience with real-time or embedded software development Knowledge of multithreaded programming and synchronization Understanding of open architecture principles and standards Experience developing user interfaces, dashboards, or visualization tools for system integration, test execution, operational monitoring, or data analysis Awareness of usability and human‑machine‑interface considerations for technical, engineering, or mission‑system applications Join us and be part of a team that’s making an impact at the forefront of technology and innovation. Pay Information Full-Time Salary Range: $220,000 - $260,000 The salary range listed is based on external market data. Offers are based on factors, such as but not limited to, the candidate’s experience, education, training, key skills/critical skills, security clearances, and prevailing market and business conditions. STR is a growing technology company with locations near Boston, MA, Arlington, VA, near Dayton, OH, Melbourne, FL, Carlsbad, CA, Atlanta, GA, and Denver, CO. We specialize in advanced research and development for defense, intelligence, and national security in: cyber; next generation sensors, radar, sonar, communications, and electronic warfare; and artificial intelligence algorithms and analytics to make sense of the complexity that is exploding around us. STRis committed to creating a collaborative learning environment that supports deep technical understanding and recognizes the contributions and achievements of all team members. Our work is challenging, and we go home at night knowing that we pushed the envelope of technology and made the world safer. STR is not just any company. Our people, culture, and attitude along with their unique set of skills, experiences, and perspectives put us on a trajectory to change the world. We can’t do it alone, though - we need fellow trailblazers. If you are one, join our team and help to keep our society safe! Visit us at for more info. STRis an equal opportunity employer. We are fully dedicated to hiring the most qualified candidate regardless of race, color, religion, sex (including gender identity, sexual orientation and pregnancy), marital status, national origin, age, veteran status, disability, genetic information or any other characteristic protected by federal, state or local laws. If you need a reasonable accommodation for any portion of the employment process, email us at View email address on click.appcast.io and provide your contact info. Pursuant to applicable federal law and regulations, positions at STR require employees to obtain national security clearances and satisfy the requirements for compliance with export control and other applicable laws. Voluntary Self-Identification For government reporting purposes, we ask candidates to respond to the below self-identification survey.Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiringprocess or thereafter. Any information that you do provide will be recorded and maintained in aconfidential file. As set forth in STR’s Equal Employment Opportunity policy,we do not discriminate on the basis of any protected group status under any applicable law. 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