The Principal Software Engineer will serve as technical anchor for a new feature/capability being added to our product. Ideal candidate will be able to architect/design a new feature and translate complex business requirements into robust, documented technical designs. Responsibilities will include coordinating closely with members of an Integrated Feature Team (IFT) to ensure high-quality delivery through the lifecycle. This role requires an active/current TS/SCI Polygraph up front. Key Responsibilities Architectural Analysis & Design: Deconstruct complex requirements to determine system impact. You will lead the creation of design documentation using Object-Oriented (OO) principles, ensuring new features integrate seamlessly without technical debt. Technical Shepherding: Act as the feature lead for a new capability. You are responsible for the "definition of done," guiding a feature from initial concept through development, testing, and deployment. Cross-Team Coordination: Serve as the technical liaison to the Systems Engineering team to align on approach and constraints. Team Leadership & Tasking: Decompose high-level feature designs into actionable tasks for the development team. Manage feature status to leadership and mentor junior/mid-level peers. Quality Assurance: Conduct rigorous merge request (MR) reviews to maintain code standards, security protocols, and performance benchmarks. Basic Qualifications TS/SCI Clearance with polygraph Bachelor's Degree or higher in computer engineering or in a field related to the computer engineering or computer science disciplines is required. Requires Bachelor's degree with a minimum of 18 years of prior relevant experience or Masters with 15 years of prior relevant experience or Doctorate with 13 years of prior relevant experience. Expert in Java (17+ preferred), the Spring Boot ecosystem, SOLID principles, OO design patterns, and REST interface standards/best practices. Strong communicator with the ability to facilitate cross-team collaboration and clearly convey architecture and design concepts through both oral and written communication. Skilled in developing technical documentation (including wiki sites, blogs, and XML/HTML content) and mentoring junior to mid-level software development peers. Desired Skillsets: Strong experience with MongoDB Data Architecture (schema design, indexing, and aggregation). Proficiency in Docker for local development and CI/CD pipelines. Familiarity with Kubernetes orchestration and the ELK Stack (Elasticsearch, Logstash, Kibana) for system monitoring and troubleshooting. Experience in PKI/TLS/SSL certificates Knowledge of ICAM Capabilities and Integration Familiarity using Confluence and Jira Strong organization and time management skills, including the ability to multi-task and work independently with minimum supervision to meet deadlines Original Posting: May 20, 2026 For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above. Pay Range: Pay Range $154,050.00 - $278,475.00 The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.