Principal Software Engineer – Front-end Developer

Date Posted: 2026-10-27 Country: United States of America Location: US-CA-SAN JOSE-826 ~ 200 Holger Way ~ BLDG 826 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: TS/SCI with Polygraph Security Clearance Status: Active and existing security clearance required after day 1 Raytheon Company managed by Collins Aerospace 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. Collins Aerospace is a leader in technologically advanced, intelligent solutions that help redefine the aerospace and defense industry. With a comprehensive portfolio and deep technical expertise, we help customers meet the demands of the global market. Join us and help shape the future of aerospace and defense. Applied Signal Technology (AST) is seeking a Principal Software Engineer  with specialization in front-end development who strives for excellence and has passion to be part of a team that strengthens our nation and improves the security of our world. AST provides trusted strategic and tactical SIGINT solutions that secure the interests of the U.S. and its partners. AST’s work in areas such as high-capacity broadband communications, signal processing and analysis, tactical SIGINT, and wireless communications continually challenge our extraordinary engineers to resolve problems and make the world a safer place.  AST’s work environment is passionate, highly collaborative and provides engineers with the freedom to strengthen and expand their skills, explore new and creative ideas, and work closely with our nation’s finest service members all while embracing integrity, innovation, and work-life balance. This is an ONSIT E position at the San Jose, CA location. To learn more about AST, please click the link below. Applied Signal Technology: WHO WE ARE What You Will Do: Apply your front-end development expertise to help create complex, innovative, and mission‑critical signals intelligence solutions. Key responsibilities include: Contribute to the requirements definition, design, development, and testing of software, including new features and enhancements to existing applications and systems. Collaborate closely with project managers, engineers, and cross‑functional teams to deliver high‑quality software capabilities. Follow established development practices and processes to ensure proper configuration management and maintainability of software products. Support the continual improvement of the software development environment, including DevOps practices, tools, and workflows within Engineering. Travel: Up to 25% domestic to other AST sites and customer locations Qualifications You Must Have: Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 8 years of prior relevant experience. Extensive experience developing in modern programming languages such as Python, Java, or C++ within a Linux environment. Strong experience building complex web applications using the Angular framework and related technologies (TypeScript, JavaScript, DevExtreme, Cytoscape, Leaflet, etc.). Working knowledge and proficiency in integrating with back‑end server‑side technologies, including application servers and databases such as Neo4j, PostgreSQL, and InfluxDB, as well as RESTful or similar web services. Proficiency with common data formats such as JSON and XML. Ability to obtain and maintain a U.S. government issued Top Secret SCI (TS/SCI) security clearance.   U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance. Qualifications We Prefer: Experience with microservices architecture, distributed systems, containerized deployments, and modern cloud technologies. Experience with RESTful APIs, messaging technologies such as Kafka or RabbitMQ, and event‑driven architectures. Experience with Agile/Scrum methodologies, DevOps practices, and test automation frameworks or tools. Proficiency with one or more scripting languages (Python, JavaScript, Bash, Perl, etc.). Experience using configuration management and defect‑tracking tools (e.g., Git, JIRA). Experience maintaining and working with complex build processes (e.g., Makefiles, CMake). Working knowledge of telecommunications systems concepts, computer network models, and protocol suites such as OSI, SS7, TCP/IP, and UMTS, including routing protocols (EIGRP, IS‑IS, OSPF, BGP). Familiarity with telecommunications network infrastructure (routers, switches, etc.) and with network reconnaissance tools and techniques. Active and transferable U.S. government issued Top Secret SCI (TS/SCI) security clearance with Poly What We Offer​ Medical, dental, and vision insurance  ​ Three weeks of vacation for newly hired employees  ​ Generous 401(k) plan that includes employer matching funds and separate employer retirement contribution, including a Lifetime Income Strategy option  ​ Tuition reimbursement program ​ Student Loan Repayment Program  ​ Life insurance and disability coverage  ​ Optional coverages you can buy pet insurance, home and auto insurance, additional life and accident insurance, critical illness insurance, group legal, ID theft protection ​ Birth, adoption, parental leave benefits ​ Ovia Health, fertility, and family planning  ​ Adoption Assistance           ​ Autism Benefit  ​ Employee Assistance Plan,