Sr. Principal Software Engineer – Signal Processing

Date Posted:2026-06-15 Country:United States of AmericaLocation:US-CA-SAN JOSE-826 ~ 200 Holger Way ~ BLDG 826, AstPosition Role Type:OnsiteU.S. Citizen, U.S. Person, or Immigration Status Requirements: Active and transferable U.S. government issued security clearance is required prior to start date.​ U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance​Security Clearance Type: TS/SCI - CurrentSecurity Clearance Status: Active and existing security clearance required on day 1At 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 with specialization in digital signal processing (DSP) techniques 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 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 ONSITE position at the San Jose, CA location.To learn more about AST, please click the link below.Applied Signal Technology: WHO WE AREWhat You Will Do:Apply your DSP expertise to solve & develop solutions to complex signal processing problems.  The key responsibilities for this position include:Lead and/or participate in next-generation IR&D projects to drive invention, design, and optimization of advance DSP algorithms.Analyze and optimize signal processing algorithms for improved performance.Resolve system level integration issues, lab anomalies, or other real-world effects on system performance/operation.Drive/implement technical solutions and mentor DSP development engineersCommunicate technical directions/roadmaps clearly with project managers and engineering leadershipTravel up to 25% to other AST locations and customers sites within the U.S.Qualifications You Must Have:Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 10 years of relevant prior experienceAdvanced signal processing analysis and development experience in one or more of the following areas:Advanced signals and protocols (modern digital communications, wideband, advanced modulations, low power, spread spectrum, frequency hopping)Waveform algorithm modeling/development, sensitivity/performance assessments, timing/carrier recovery and tracking, modulation/demodulation processingDigital beamforming, signal detection, direction of arrival measurements and emitter location techniquesSignal survey, snapshot, detection, identification, direction finding, and geolocation.Demonstrated expertise utilizing modern C++, MATLAB, Python, or equivalent environments to architect, implement, and validate complex signal processing solutions.Active and transferable U.S. government issued Top Secret SCI (TS/SCI) security clearance required prior to start date.U.S. citizenship is required, as only U.S. citizens are eligible for a security clearanceQualifications We Prefer:Experience applying Machine Learning models for signal classification, modulation recognition, or cognitive radio applications.Experience applying DSP techniques to Spread Spectrum and/or Ultra-Wideband signals.Experience working in the Defense industry, the Intelligence Community, or with other U.S. Government agenciesPossess active and transferable U.S. government issued Top Secret SCI (TS/SCI) security clearance with Full-scope PolyWhat 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 ​Relocation Eligibility – EligibleAnd more!   Learn More & Apply Now!​Do you want to be a part of something bigger? A team whose impact stretches across the world, and even beyond? At Collins Aerospace, our Mission Systems team helps civilian, military and government customers complete their most complex missions — whatever and wherever they may be. Our customers depend on us for intelligent and sec