Principal Software Engineer - Advanced Simulation & Training Systems (Onsite)

Date Posted: 2026-06-18 Country: United States of America Location: US-VA-STERLING-291 ~ 22640 Davis Dr ~ DAVIS Position Role Type: Onsite U.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: Secret - Current Security Clearance Status: Active and existing security clearance required on day 1 Principal Software Engineer - Advanced Simulation & Training Systems (Onsite) 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. Role Description:    We are searching for a Principal Software Engineer to join our team in Sterling VA within the Strategic Defense Solutions (SDS) business area.   Our teams develop and build highly realistic simulators and training systems for both military and commercial customers.  We deliver highly specialized training for some of the most demanding jobs in aviation.  Devices range in complexity from desktop training all the way to high fidelity weapon system and full-flight training systems including full visual motion and simulator interoperability. In this position, you will become a technical subject matter expert for the design, implementation, and testing of complex multi-platform training device software and their associated user interfaces.  This position requires a highly skilled individual who can step onto a team and quickly come up to speed on complex systems, who is also comfortable dealing with customers and program leadership. We are seeking a candidate who thrives in a team-oriented environment, demonstrates leadership qualities, and is passionate about mentoring peers and advancing technical excellence. Candidates with agile development experience and the desire to grow into agile leadership roles are strongly encouraged to apply!  This position requires an active US security clearance.  Most aspects of the job are done in a classified lab environment and requires a daily onsite presence.  What You Will Do: Design, develop, integrate, and test software on cross-functional agile teams to deliver solutions within budget, scope, and schedule constraints  Exhibit ownership of and accountability for committed objectives Assist in analysis and decomposition of features Make and influence decisions which impact cost, schedule, and technical performance at a program level  Highly motivated software development focal who is able to drive strong technical solutions and decision making Perform multi-threaded software debugging   Work independently with limited supervision  Mentor early-career engineering peers to advance their ability to contribute to team objectives Demonstrate leadership qualities in your everyday work - Be a positive focal for your team, recognize peers’ accomplishments, and help onboard junior team members.  Perform and lead bidding and proposal activities to support the acquisition of new business  Contribute to software and systems engineering requirements capture and analysis  Travel to domestic and international customer sites to support training events and product installations  Qualifications You Must Have: Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and minimum 8 years prior relevant experience or an Advanced Degree in a related field and minimum 5 years of experience Active and transferable U.S. government issued security clearance is required prior to start date Must have previous experience working with C++.  Have experience with agile development practices and general software engineering design principles  Qualifications We Prefer: Prior experience with training simulations Familiarity with common training and avionics protocols (ARINC 429, ARINC 610, MIL-STD-1553, etc.) Excellent written and oral communication skills  Familiarity with Windows and Linux development environments   Candidate exhibits leader-like qualities and has a willingness to share their knowledge and build up their peers  Experience using Visual Studio Familiarity with DevSecOps and Agile development methodologies  Strong OOP and C++ language skills including STL, Templates  Familiarity with scripting languages (Python, Perl, etc.)  Usage of source code control tools (GIT, SVN, ClearCase, etc.)  Usage of ALM tools (JIRA, Confluence, Crucible) Usage of GitLab CI/CD tools within software development processes 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 secure communications, missionized systems for specialized aircraft and spacecraft and collaborative space solutions. By joining our team, you’ll have your own critical part to play in ensuring our customer succeeds today while anticipating their needs for tomorrow. Are you up for the challenge? Join our mission today. What We Offer: Some of our competitive benefits package includes:    Medical, denta