Matrix

Tell me about yourself and your experience.

What are traits in Scala, and how are they different from classes?

Explain the differences between Data Warehouse, Data Lake, and Delta Lake

Why should we hire you for this role?

Design an anti-skew strategy for a join on a high-cardinality key with a long-tail distribution (e.g., a few keys hold 80% of rows). Cover salting, split-skew, AQE, and cost/operational trade-offs.

Calculate a 7-day moving average of clicks for each user_id

Calculate cumulative sales for each product in each store, ordered by sale_date

Difference between var, val, and def in Scala