SQL Engineer SME

Job Overview We’re hiring a SQL Engineer SME to support a highly visible, data‑driven application that powers analytics and reporting across the organization. This role involves writing complex queries, shaping data for dashboards, optimizing performance at scale, and delivering high‑quality datasets that stakeholders rely on every day. The primary development team operates out of Gaithersburg, MD, with onsite locations in Alexandria, VA; Chantilly, VA; Aurora, CO; St. Louis, MO; and Tucson, AZ. Key Responsibilities Develop advanced, high‑performance SQL queries across large, complex datasets (multi‑table joins, window functions, aggregations) Optimize query performance using execution plans, indexing strategies, and query refactoring Ensure data accuracy and integrity across reporting datasets Troubleshoot and resolve data issues across database and application layers Shape and structure data for efficient and intuitive dashboard visualization Collaborate with ETL engineers and dashboard developers to ensure reliable, end‑to‑end data delivery Basic Qualifications Bachelor's degree with 12‑15 years of experience, or Master’s with 10‑13 years of experience. May possess a Doctorate in a technical domain U.S. Citizenship Active TS/SCI with the ability to successfully pass a Polygraph Expert‑level SQL skills, including: Complex joins across large datasets Query optimization and execution plan analysis Aggregations, subqueries, and window functions Strong experience with relational databases (PostgreSQL, MySQL, Oracle, or similar) Experience working with large‑scale data supporting analytics/reporting Proficiency in Linux environments Ability to work independently and solve complex data challenges Preferred Qualifications Experience with Grafana or similar visualization tools Python for data manipulation (pandas, scripting, automation) Experience with materialized views, caching strategies, or query acceleration techniques Pay Range $131,300.00 – $237,350.00. The pay range for this job level is a general guideline only and not a guarantee of compensation. Benefits Compensation packages include competitive salary, Health and Wellness programs, Income Protection, Paid Leave, and Retirement benefits. 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 Leidos Inc