[Job Radar](https://jobradar.live/) / [Jobs](https://jobradar.live/ilanlar) / Sr. Prin Software Engineer (On-site) Active On-site Merrimack, NH Posted · 01.10.2026 LinkedIn Jobs US # Sr. Prin Software Engineer (On-site) HEPCO, Inc. HEPCO is seeking a Senior Software Engineer to support our client’s advanced research and development programs for U.S. defense applications. This role involves designing, developing, testing, integrating, and maintaining complex software solutions in a collaborative, secure engineering environment. Design and evaluate software architectures that meet program, customer, security, and performance requirements. Develop, test, debug, integrate, and maintain software primarily using C++11 or later in Linux environments. Support distributed, multithreaded, real-time, embedded, low-latency, signal-processing, and device-control applications. Integrate software with hardware such as FPGAs, GPUs, embedded systems, sensors, and peripherals. Support applications involving RF, radar, EO/IR, electronic warfare, software-defined radio, autonomy, artificial intelligence, and cyber systems. Apply software engineering best practices, including object-oriented design, code reviews, automated testing, configuration management, and CI/CD. Develop and operate software in containerized and cloud-native environments, as applicable. Collaborate with engineers, program leadership, customers, and cross-functional teams in an agile development environment. Support on-site integration, testing, and demonstrations. Required Qualifications Active Top Secret security clearance. Bachelor’s degree in Computer Science, Computer Engineering, Software Engineering, or a related technical field from an accredited college or university. At least 6 years of professional software development experience. Advanced proficiency in object-oriented software design and development using C++11 or later. Advanced experience developing and operating software in Linux environments. Experience designing, implementing, testing, debugging, integrating, and maintaining complex software applications. Strong understanding of software architecture and software engineering best practices. Strong leadership, communication, collaboration, and problem-solving skills. Ability to adapt to changing technical and program requirements in a fast-paced research and development environment. Preferred Qualifications Master’s degree or PhD in a related technical field. Python and/or MATLAB development experience. GPU programming experience using CUDA and/or OpenCL. Experience supporting research, rapid-prototyping, defense, intelligence, or other mission-critical programs. Experience with real-time, embedded, distributed, multithreaded, or low-latency systems. Experience with DevSecOps, CI/CD pipelines, automated testing, automated release management, and secure software development. Experience with Docker, Podman, Kubernetes, Harbor, and/or Helm. Familiarity with hardware interfaces and protocols, including UART, I2C, SPI, and CAN. Knowledge of Digital Engineering and Model-Based Systems Engineering practices. Benefits: Health Insurance 401k Pay Range: $67.00 - $72.00 per hour (Depending on experience and qualifications) By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from HEPCO, Inc and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at https://www.hepcoinc.com/privacy/ All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, gender expression, marital status, national origin, age, veteran status, disability, or any other protected class. This job was verified from LinkedIn Jobs US. Applications are completed on the original source. [Apply on the original listing ↗](https://jobradar.live/ilan/6bb746b8-2c77-43e5-ae15-f0b0bf1ede40/git) ## Stop searching one by one for roles like this. Upload your resume or enter your target roles to see your first 3 matches for free. [Find jobs for me →](https://jobradar.live/uye/kayit) Your resume is never shared with employers; it is processed only for matching. 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