Role: Sr. Data Analyst Location: McLean VA- Onsite Key ResponsibilitiesGather requirements, define KPIs, and translate business needs into scalable analytics deliverables (datasets, semantic models, dashboards, and insights).Write and optimize advanced SQL across SQL Server, Snowflake, and Microsoft Fabric (Warehouse/Lakehouse).Design and maintain analytics-ready data models (dimensional/star schemas, curated layers, reusable views/tables).Build, enhance, and performance-tune dashboards and re