Senior Software Engineer

We are seeking a highly skilled Senior Software Engineer to design, develop, and maintain modern web applications. The ideal candidate combines expertise in full stack development, data visualization, and cloud‑ready application architecture to deliver scalable solutions supporting data‑driven decision making. This position is onsite in Woodlawn, MD. Responsibilities Design, develop, and maintain full stack web applications that enable users to explore and analyze complex statistical datasets. Build responsive, interactive data visualization tools using modern JavaScript frameworks and visualization libraries. Develop intuitive user interfaces that improve access to large public datasets through dynamic filtering, querying, and exploration capabilities. Design and optimize APIs and backend services supporting high-performance data delivery. Develop, maintain, and optimize large‑scale data processing pipelines and automated workflows. Create and manage databases and data models supporting enterprise analytics and visualization platforms. Refactor legacy applications and workflows into scalable, maintainable, server‑based architectures. Collaborate with product owners, subject matter experts, data providers, and stakeholders to translate business requirements into technical solutions. Apply software engineering best practices including automated testing, code reviews, version control, documentation, and CI/CD processes. Support application security reviews, deployment activities, and ongoing system maintenance. Maintain technical documentation, data schemas, and build processes while ensuring backward compatibility across production systems. Troubleshoot application, database, and infrastructure issues across development and production environments. Contribute across multiple technical disciplines including software engineering, data engineering, systems administration, and technical consulting. Required Qualifications Bachelor's degree and 12+ years experience. Strong experience developing full stack web applications using modern JavaScript frameworks (Vue.js, React, or similar). Experience developing interactive visualizations using D3.js or comparable visualization libraries. Strong programming experience with Python and JavaScript. Experience building RESTful APIs and backend services. Experience with relational databases such as PostgreSQL and spatial technologies including PostGIS. Experience designing and maintaining geospatial data processing workflows. Knowledge of software development lifecycle practices including version control, testing, and code review. Experience developing applications supporting large, complex datasets. Excellent analytical, problem‑solving, and communication skills. Must be able to obtain and maintain a public trust clearance. Preferred Qualifications Experience with Vue.js, Vuex, XState, Tailwind CSS, Vuetify, GraphQL, Node.js, and jQuery. Experience with automated testing frameworks such as Playwright, Vitest, or similar. Familiarity with enterprise data governance, statistical data products, or federal data standards. Experience supporting secure software development and application authorization processes. Experience working with economic, demographic, or public‑sector data products. Ability to work effectively with cross‑functional teams, technical stakeholders, and business partners. Technical Skills Languages: JavaScript, Python, SQL Frontend: Vue.js, Vuex, D3.js, Tailwind CSS, Vuetify, jQuery Backend: Node.js, GraphQL Databases: PostgreSQL, PostGIS Testing: Vitest, Playwright, pgTap GIS: ArcGIS, Geospatial Data Processing Documentation: AsciiDoc Other: REST APIs, Data Visualization, Data Pipelines, Software Architecture, CI/CD, Code Reviews Pay Range Pay Range: $131,300.00 - $237,350.00 Commitment to Non-Discrimination All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws. #J-18808-Ljbffr