Senior Principal Software Engineer (Onsite)

Job ID: 01865853Posted: Posted TodayStart Date: 2026-08-19Location: US-MD-FULTON-8170 ~ 8170 Maple Lawn Blvd ~ MAPLE LAWN, Ste 190, 200 & 300Country: United States of AmericaTime Type: Full timeDate Posted:2026-08-19 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 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.Solipsys, Managed by Collins AerospaceCollins Aerospace, an RTX company, is a leader in technologically advanced and intelligent solutions for the global aerospace and defense industry. Collins Aerospace has the capabilities, comprehensive portfolio, and expertise to solve customers’ toughest challenges and to meet the demands of a rapidly evolving global market. Solipsys is a wholly owned subsidiary of Collins Aerospace/RTX and is currently seeking a 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 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. This is an onsite role at our Fulton MD facility.What You Will DoDrive the 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. Qualifications You Must HaveRelevant 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 experienceThe 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 PreferDirect 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 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 environmentExperience with Container Orchestration implementation such as Docker, Kubernetes, OpenShiftExperience 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.*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.What We Offer Benefits Some of our competitive benefits package includes: Medical, dental, and vision insuranceThree weeks of vacation for newly hired employeesGenerous 401(k) plan that includes employer matching funds and separate employer retirement contribution, including a Lifetime Income Strategy optionTuition reimbursement programStudent Loan Repayment ProgramLife insurance and disability coverageOptional coverages you can buy pet insurance, home and auto insurance, additional life and accident insurance, critical illness insurance, group legal, ID theft protectionBirth, adoption, parental leave benefitsOvia Health, fertility, and family planningAdoption Assistance         Autism BenefitEmployee Assistance Plan, including up to 10 free counseling sessionsHealthy You Incentives, wellness rewards programDoctor on Demand, virtual doctor visitsBright Horizons, child and elder care servicesTeladoc Medical Experts, second opinion programAnd more! Eligible for relocationLearn 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 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.At Collins, the paths we pave together lead to limitless possibility. And the bonds we form – with our customers and with each other -- propel us all higher, again and again.Apply now and be part of the team that’s redefining aerospace, every day.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.The salary range for this role is 145,600 USD - 276,800 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. Privacy Policy and Terms:Click on this link to read the Policy and Terms