Senior Principal Software Engineer

Date Posted 2026-09-23 Country United States of America Location US-UT-WEST VALLEY CITY-338 1127 & 1128 w 2400 S BLDG 338 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 Senior Principal Software Engineer who strives for excellence and has a 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 challenges our extraordinary engineers to resolve problems and make the world a safer place. AST's work environment is passionate and highly collaborative. It provides engineers 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. What You Will Do Participate in the requirements, design, development and testing of software to include development of new work products or enhancement of existing applications and systems Design, code, test, integrate, and document software solutions Participate in internal review of software components and systems Collaborate with project managers and other professionals within Engineering Follow established development practices and processes to maintain the configuration management of software products Qualifications You Must Have Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 10 years of prior relevant experience. Experience developing in modern programming languages (e.g. C ) in a Linux environment Good working knowledge of data structures and how to efficiently use them to solve problems Experience with one or more scripting languages (e.g. Python) Experience working with containerized software and associated tools (Kubernetes, Helm, Podman) Ability to obtain a U.S. government issued Top Secret SCI (TS/SCI) security clearance with polygraph U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance Qualifications We Prefer Experience with Multithreading Experience working both in a team environment and individually Experience with network protocols such as TCP/IP Experience with Qt Experience with User Interface development Experience with Angular web GUI development Embedded SW Design Experience Experience in integrating software with hardware Experience with Configuration Management tools, such as git Experience maintaining and using build processes (makefiles, CMake) Familiarity with event-driven systems and messaging platforms such as Kafka Familiarity with RESTful APIs and gRPC Experience with or basic understanding of telecommunications systems concepts and/or signal processing Experience with or basic understanding of International Telecommunication Union (ITU) Standards 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, including up to 10 free counseling sessions Healthy You Incentives, wellness rewards program Doctor on Demand, virtual doctor visits Bright Horizons, child and elder care services Teladoc Medical Experts, second opinion program Eligible for relocation And More! The salary range for this role is 132,400 USD - 251,600 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate's work experience, location, education/training, and key skills. Hired applicants may be eligible for benefits, including but not limited to, medical, dental, vision, life insurance, short-term disability, long-term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and holidays. Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective‑bargaining agreement. Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective‑bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company's performance. This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply. RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window. RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans' Readjustment Assistance Act. Please ensure the role type (defined below) is appropriate for your needs before applying to this role. Onsite Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products. As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on‑site, hybrid or remote. #J-18808-Ljbffr RTX