Senior Principal Software Engineer (Onsite)

Date Posted: 2026-07-23 Country: United States of America Location: US-MD-FULTON-8170 ~ 8170 Maple Lawn Blvd ~ MAPLE LAWN, Ste 190, 200 & 300 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: DoD Clearance: Secret Security Clearance Status: Active and existing security clearance required after day 1 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. Solipsys, Managed by Collins Aerospace Solipsys is a wholly owned subsidiary of Collins Aerospace/RTX and is currently seeking a Senior Principal Software Engineer who is enthusiastic, hardworking, and proactive in writing and developing code using programming languages and related technologies such as Java, C++, Angular, GraphQL, REST, KafKa, and Typescript (among many others).  The successful candidate will work in an exciting environment, directly driving the strategy, design, architecture, and development of new software systems and products utilizing these technologies. Solipsys is an industry leader in the development of command and control software systems and operates in a dynamic, complex, fast-paced business environment with both commercial and Government customers, including a mix of domestic and international pursuits and programs. What You Will Do Drive the strategy, design, architecture, and development of critical capabilities in an active Agile environment. Demonstrated leadership skills with ability to coordinate the activities of multiple engineers working on a program, ensuring successful technical execution and delivery of solutions for the customer. Proactive leadership skills – proven ability to recognize issues early and to lead and motivate teams by making smaller, decisive corrections to avoid larger problems. Adept at communicating (verbal and written) with all levels within and outside the company, ability to prepare and deliver presentations/summaries which appropriately address the intended audience. Work in a highly collaborate team environment to design, architect and innovate software solutions. This is an onsite position at our Fulton location. Qualifications You Must Have Relevant work experience in software development using object oriented programming languages such as Java or C++. Relevant work experience with full life cycle development including software requirements, design, development, debug and test.   Strong computer science fundamentals: such as data structures, algorithms, distributed systems, information retrieval. Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and minimum 10 years prior relevant experience or an Advanced Degree in a related field and minimum 7 years of experience 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. Qualifications We Prefer Direct hands on individual experience with GraphQL, REST, Kafka, RabbitMQ, Redis, Postgresql, Docker, Kubernetes, Angular, Typescript, HTML/CSS, among many other programming languages and related technologies.  Especially in driving the strategy, design, and architecture of software applications and systems. Demonstrated skills with C++ related Technologies: Boost/STL/Standard C++ Library/etc . Experience developing, assessing and validating complex mathematical solutions such as track filters, track correlation algorithms, and weapon engagement algorithms, for sensors and/or C2 programs.  Demonstrated experience developing software in a Linux environment Experience with Container Orchestration implementation such as Docker, Kubernetes, OpenShift Experience with managing cyber security processes including vulnerability assessments. Experience developing system models, simulations, and complex algorithmic solutions, in addition to utilizing tools such as Matlab. WE ARE REDEFINING AEROSPACE. *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. Regardless of your role type, collaboration and innovation are critical to our business and all employees will have access to digital tools so they can work with colleagues around the world – and access to Collins sites when their work requires in-person meetings. Some of our competitive benefits package includes:  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 leg