Coding problem: Given a matrix, write the code to replace all values by the sum of all their neighboring values. DE questions: How do you debug any issues in your data warehouse? How do you monitor data quality in ETL and apply DQ checks? ETL vs ELT? What orchestration platforms do you know about? How do you handle job failures & add job monitoring using that? What is idempotency? In a spark ETL, how will you ensure idempotency? What is Medallion architecture? Scenario based questions related to the Medallion architecture & designing ETLs.