Top 100 Data Warehouse Interview Q&A – Real-Time Scenarios & Answers (2025 Edition, 3+ YOE)

Description

Top 100 Data Warehouse Interview Q&A – Real-Time Scenarios & Answers (2025 Edition, 3+ YOE) is your complete interview preparation handbook designed for data professionals with 3+ years of experience + Freshers.

This guide is not just theory — it’s packed with real-world scenarios, SQL code examples, and practical case studies that reflect what leading companies (FAANG, Big 4, and top MNCs) are asking in 2025.

🔑 What You’ll Get Inside

✔️ 100 curated interview questions across Data Warehouse, ETL/ELT, Data Modeling, CDC, Streaming, Lakehouse, and Cloud Platforms (Snowflake, Redshift, BigQuery, Synapse).
✔️ Format that works → Every question is explained in “What they asked me | What I said | Tips” style, so you learn how to answer like a pro.
✔️ Real-time scenarios → Star vs Snowflake schema, SCD2 implementation, CDC with MERGE, Data Vault to Kimball marts, late-arriving facts, hybrid tables, semantic layer, vector search in DW.
✔️ Hands-on SQL & code snippets → Ready-to-use examples in SQL, dbt, and streaming frameworks (Spark Structured Streaming, Kafka, Delta).
✔️ Latest 2025 trends covered → Lakehouse architectures, open table formats (Delta/Iceberg/Hudi), data contracts, observability, SLAs/SLOs, GenAI integration with warehouses.
✔️ Practical tips for performance tuning, cost optimization, testing frameworks, and governance (GDPR/DPDP compliance).

🎯 Who Is This For?

• Data Engineers & Data Warehouse Developers (3+ YOE)
• BI/ETL Developers transitioning to modern DW tools
• Professionals preparing for interviews at product companies, consulting firms, or startups
• Anyone looking to upgrade their DW, SQL, and modeling skills

💡 Why This Guide?

Because interviews in 2025 have changed — they’re no longer about definitions but about solving real-world data problems. This guide prepares you to answer with confidence, clarity, and impact.