Senior Data Engineer (Python, Snowflake Development) McLean, VA Need Local in person Interview Long Term Contract Design, build, and deploy end-to-end data pipelines for large-scale data processing.Develop and maintain backend data services and APIs to support data consumption.Perform Snowflake data modeling, including schema design, optimization, and performance tuning.Implement ELT/ETL processes for structured and semi-structured data sources.Optimize data storage, query performance, and cost