Principal Software Engineer

STR is hiring a Principal Software Engineer to be part of a multidisciplinary cyber/networking team dedicated to developing cutting-edge technologies with significant and immediate impact on our national security. Our team develops is developing breakthrough technology through communications innovation on all networking levels, from the physical to the application layer. We believe that everyone has a unique set of skills, experiences, and perspectives that are essential to providing our customers with innovative solutions. The skills below are intended to give you a sense for the position. If you see any overlap with your skills, go ahead and apply!

A successful candidate will possess several years of practical experience in software engineering, integration and testing, and networking concepts and protocols. They will demonstrate a proven ability to take ownership of technical challenges and deliver results in collaborative, fast-paced environments. The ideal candidate will bring a deep understanding of computer science concepts, sound software engineering principles, and hands-on experience working on Linux systems. Experienced engineers at STR are expected to work independently while contributing meaningfully to team efforts and mentoring less experienced team members.

This is an exciting opportunity to work in a high-profile, fast paced yet structured development environment alongside a diverse and talented team. In this role, you will take a leadership role in designing, implementing, and testing software that enhances advanced real-time data communications and networking solutions using open systems principles. We aim for the highest standards of quality, maintainability, and reuse in our tools and techniques. Therefore, candidates should have a demonstrated ability to produce well-designed, scalable solutions and to establish and follow reliable testing methodologies.

What you will do:

• Collaborate closely with a small, dedicated research team to develop innovative solutions to complex problems


• Take ownership of significant features or components of projects and deliver them with minimal supervision


• Lead technical discussions, guide architectural decisions, and mentor junior engineers


• Develop and test novel software solutions spanning research, development, and deployed production systems


• Analyze and improve existing designs and processes to optimize performance


• Deliver high-quality software in a rapid-paced, research-focused team environment


• Develop operational prototypes for experimentation and performance analysis


• Create customer-facing operational systems, ensuring they meet high reliability and usability standards

Who you are:

• This position requires the ability to obtain a Top Secret (TS) security clearance, for which U.S. citizenship is needed by U.S. Government.


• 10+ years of experience in relevant software engineering roles


• Proficient in Python, C, C++, or similar interpreted or low-level programming languages


• Experienced with designing and implementing open architectures and rapid prototyping methodologies


• Strong working knowledge of software testing, evaluation best practices, and industry-standard development lifecycles


• Significant hands-on experience developing software with GNU/Linux toolchains using open-source software


• Deep understanding of networking principles, including the 5-layer OSI networking stack


• Strong team player with excellent communication skills, both verbal and written


• Bachelors or Masters degree in Computer Science, Electrical & Computer Engineering, Applied Mathematics or other related fields and at least 10 years of applicable experience

Nice to have:

• Active Top Secret (TS) Security Clearance


• Advanced experience using Python, MATLAB, and other high-level programming languages


• Proven experience building, deploying, and maintaining robust and stable software


• Experience writing software using a large multi-party code base


• Demonstrated success managing technical challenges in experimental/laboratory environments, including performing quantitative analysis


• Experience developing software using machine learning techniques


• Familiarity with multi-threaded or multi-core real-time operating concepts


• Experience with high level-software architecture design


• Demonstrated leadership abilities, including mentoring junior staff and contributing to team efficiency

Pay Information
Full-Time Salary Range: $206,000 - $284,000

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, and Carlsbad, CA. 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.

STR is 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.

STR is 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 [email protected] 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.