Tell me about yourself How would you design an efficient data pipeline for processing large-scale real-time streaming data? Follow-up: What tools and frameworks would you use (e.g., Apache Kafka, Spark Streaming, Flink)? Can you explain the difference between OLAP and OLTP databases? How would you choose between them for a given use case? What are the best practices for optimizing SQL queries and database performance in a large data warehouse? Follow-up: Can you discuss indexing, partitioning, and query optimization techniques? How do you ensure data quality, consistency, and reliability in an ETL process? Follow-up: How would you handle schema changes in a data pipeline? Have you worked with cloud-based data solutions like AWS Redshift, Google BigQuery, or Snowflake? How do they compare to traditional on-premises databases?