Senior Software Engineer - Modeling (Onsite)

Date Posted: 2026-11-04 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: 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 Senior Software Engineer - Modeling (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. U.S. citizenship only (dual citizenship not permitted) is required, as access to information under this program/contract is restricted to individuals with sole U.S. citizenship.  Most aspects of the job must be accomplished in a lab environment, so this position requires regular on-site presence. This position is located onsite at our Sterling, VA site. What You Will Do: Develop and implement software solutions using programming languages such as C/C++, C#, Python, Java, and Lua. Design and maintain aerospace modeling and simulation systems to support complex engineering projects. Lead system design and integration efforts, ensuring seamless functionality across hardware and software components. Utilize tools such as Visual Studio Studio/Code, VMWare, Wireshark, Ansible, Docker/Podman, Packer, Terraform, GitLab, and Kubernetes for software development and deployment. Collaborate with multidisciplinary teams to drive project execution, resolve technical challenges, and achieve program milestones. Create and manage YAML-based configurations for automation and deployment processes. Provide technical leadership and mentorship to team members, fostering a culture of collaboration and continuous improvement. Ensure compliance with security and regulatory requirements throughout the software development lifecycle. Support and develop automation solutions that enable our teams to build and deploy code efficiently and consistently. Support and develop the program’s CI/CD pipeline, optimizing code integration and delivery of the simulation environment. Use troubleshooting skills to resolve issues with software solutions, build chain or CI/CD pipeline tools. Qualifications You Must Have: Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and minimum 5 years prior relevant experience or an Advanced Degree in a related field and minimum 3 years of experience Must have or be capable of obtaining a US Department of Defense (DoD) security clearance. Candidate selected will be subject to a government security investigation/reinstatement and must meet eligibility requirements U.S. citizenship only (dual citizenship not permitted) is required, as access to information under this program/contract is restricted to individuals with sole U.S. citizenship. Qualifications We Prefer: Proficiency in aerospace modeling and simulation tools and techniques. Prior work experience with system design and integration processes. Experience with common software development and management tools such as Visual Studio/Code, GitLab, Jira, Confluence, Coverity, Nexus, and Artifactory. Experience with software development using C/C++, C#, Python, and Lua. Experience with server-side scripting languages such as Python, Bash, and PowerShell. Experience with a virtual environment such as VMware, Proxmox, etc. Experience working in Linux and Windows environments. Experience with continuous integration for real-time testing and diagnostics within a virtualized environment. Basic understanding of networking (TCP/IP, VLANs) and experience configuring network devices or virtual networks. Experience in application development and integration within one or more IaaS/PaaS (Red Hat OpenShift / VMware / OpenStack). Familiarity with cloud networking frameworks (L2, L3, and spine-leaf architecture). Experience in microservices using RESTful APIs. Experience with Agile Development Methodologies (e.g. Scrum, SAFe). Familiarity with Docker/ Podman containers, or Kubernetes orchestration. Familiarity with maintaining and deploying database technology, such as SQL and NoSQL databases like MongoDB, PostgreSQL and MonetDB. Familiarity with JSON, XML, YAML and XSD formats, rules, and usages. Experience in refactoring legacy systems for cloud or virtual environments. Development IDEs such as Visual Studio, Visual Studio Code, or other related. Certifications: Security (Security+, CISSP, or equivalent); Networking (CCNA,or equivalent). Experience in application development and integration within one or more cloud platform services such as (Amazon Web Services, Microsoft Azure, Google Cloud, VMware Cloud). 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