Principal Software Engineer

Security Clearance: M must be able to obtain and maintain a public trust clearance Job Type: Full-Time Target Salary Range*: $145,000 - $185,000. *This represents the potential salary range for this position depending on education level, years of experience and/or certifications in addition to other position specific requirements which may impact salary Position Overview Key Responsibilities Design and develop software applications using Twelve-Factor App methodology from functional requirements. Develop highly innovative UI design, Web components, achieved through collaboration and dialogue with other experts in the field. The candidate will continually assess advancements in technologies to gauge and recommend better solutions for the customer to improve the software developer experience and efficient delivery of software. Design Web Page components that are compliant with Section 508 of the Rehabilitation Act (29 U.S.C. 794d). Design and develop Microservices using Spring Boot, Java and RESTful architecture. Solid understanding of DevOps practices, CI/CD pipelines, and tools such as Jenkins, Git, Bitbucket, OpenShift and experience with cloud platforms (AWS, Azure, or Google Cloud) and containerization technologies. Develop and maintain Enterprise Java Batch application using Java Specification Request (JSR) 352 specification and schedule Java Batch jobs using Control‑M. Develop Simple Object Access Protocol (SOAP) based Web Services using technologies such as JAX‑WS, Apache Axis, and Web Services Description Language (WSDL). Implement Web Service Security using WS‑Security using existing IBM DataPower infrastructure. Ensure interoperability with Web‑Services‑Interoperability (WS‑I) standards, and optimize message transmission using Message Transmission Optimization Mechanism (MTOM) or SOAP with Attachments (SWA). Ability to collaborate with cross‑functional teams, including business analysts, QA, and project managers and commitment to continuous learning and staying updated with emerging technologies. Develop the Data Access Layer (DAO) to interface the application with IBM DB2 9.0 and PostgreSQL databases running on z/OS mainframe and Linux operating systems and other platforms, utilizing JPA or Spring Data API for querying and retrieving data through Object Relational Mapping (ORM). Create POCs, templates for developing Behavior Driven Development (BDD) test framework for the APIs using Cucumber, Gherkin, and Java to implement Integration tests. Develop unit test cases for every possible Java class with real scenarios using JUnit, Mockito and Power Mock frameworks. Use Visio, Confluence and IT Governance Frameworks to document the solution architecture & develop UML based design documents. Attend all customer technical discussions/design/development meetings and provide viable technical solutions to further enhance the existing architecture and improve code quality/process. Impact functional strategy by developing new solutions, processes, standards, or operational plans that position Leidos competitively in the marketplace. Provide guidance/support to other junior/mid‑level developers. Experience as hands on Technical Lead. All other duties as assigned or directed. Qualifications Education Bachelor's Degree in Computer Science, Mathematics, Engineering or a related field. Masters or Doctorate degree may substitute for required experience. Experience 10+ years of experience with Java, Spring Boot, Angular, React. Extensive Design and Programming skills in Java and JEE technologies. Extensive hands‑on experience with one or more frameworks such as Angular, React, and Express/Node.js. Experience as hands on Technical Lead. Experience working on Agile projects and strong knowledge of Agile terminology and tools including Agility. Experience in designing high‑throughput and low‑latency systems, including architecting scalable solutions capable of handling large volumes of concurrent requests with minimal response times. Experience in developing the applications using Single‑Page Application Architecture. Proficient in implementing efficient data processing pipelines, optimizing application performance through asynchronous processing, caching strategies, and load balancing. Experience designing and deploying cloud‑native applications onto AWS with PostgreSQL. Deep Knowledge of PaaS offerings such as Red Hat OpenShift and Docker. Experience with modern software development tools for Continuous Integration including Jenkins, Git/BitBucket, Jira, Nexus, Maven, Jenkins, SonarQube, Fortify, and UrbanCode Deploy. Experience with Web Services Technologies (XML, JAXP, JAXB, JAX‑WS, AXIS, JERSEY, JSON, CXF, REST and SOAP) and Security (LTPA, OAUTH2/JWT). Hands‑on Design and development experience on Microservices and RESTful API. Experience with Automated unit test (i.e. JUnit, Mocking frameworks), Test Driven Development (TDD), and Behavior‑driven development (BDD) (Cucumber). Experience with JEE technologies including Struts, Spring Framework (IoC, MVC, Transactions, Security, and Batch), Spring Boot, Spring JDBC, JPA, Hibernate, SOAP/RESTful, XML, DB2, Tomcat, WebSphere. Experience with static code analyzers like SonarQube and addressing SonarQube recommended technical debts such as bugs, vulnerabilities, hotspots in the code. Knowledge of security vulnerabilities in web applications and addressing them. Experience with performance tuning software applications for effective CPU, Memory utilization, Quick turnaround response time, building highly scalable software applications in Cloud Environment handling higher volume of data and traffic. Preferred Qualifications Proficient in designing and implementing Kafka‑based event‑driven architectures, including the use of Kafka producers, consumers, topics, partitions, and consumer groups for scalable and fault‑tolerant data streaming. Experienced in configuring Kafka brokers, managing message retention policies, and optimizing throughput with appropriate replication and partitioning strategies. Familiar with integrating Kafka Connect for data ingestion, utilizing Kafka Streams for real‑time data processing, and monitoring Kafka clusters for performance and reliability. Demonstrate a strong understanding of the latest trends in Artificial Intelligence (AI) and showcase the ability to apply AI knowledge to enhance or redesign existing system architectures, identifying opportunities where AI‑driven solutions can add value, improve efficiency, or enable new capabilities. Experience with the implementation of Section 508 standards for Web Applications. Exposure to writing Technical White Papers and systems design documents. Prior experience with federal or state governments IT projects. Experience with low code platforms like ServiceNow, Pega, MS Power Platform etc. #J-18808-Ljbffr