DE Interview Preparation
Crack Your Next Data Engineering Interview
Curated real interview questions, system design frameworks and expert tips from engineers who cleared interviews at top Indian tech companies.
500+Questions
4Tracks
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RealCompany Qs
💡 Pro Interview Tips
Structure answers with STAR method for behavioural questions
Always mention scale — companies want to hear "at 10M records/day"
Connect concepts to tradeoffs — there's never one right answer
Ask clarifying questions before designing — show senior thinking
Repeat the question back to confirm your understanding
After your answer, mention how you'd test and monitor it in prod
Interview Tracks
Pick your track and go deep
Each track contains the most commonly asked questions from actual DE interviews at top companies in India.
PySpark & Spark
Explain the Spark execution model and DAG
Difference between RDD, DataFrame and Dataset
How does Spark handle data shuffling?
Explain broadcast join and when to use it
What is speculative execution in Spark?
Data Engineering
Design a real-time ETL pipeline for 1M events/min
How would you handle late-arriving data in streaming?
Explain SCD Type 1, 2, and 3 with examples
What is data lineage and why does it matter?
How do you ensure exactly-once processing?
SQL & Databases
Difference between RANK, DENSE_RANK, ROW_NUMBER
Write a query to find the 2nd highest salary
Explain clustered vs non-clustered indexes
What is a covering index?
Optimize a query with a slow nested subquery
System Design
Design a data lakehouse for a fintech company
How would you build a real-time recommendation system?
Design an event-driven pipeline with Kafka
Explain Lambda vs Kappa architecture
How to handle 1TB daily data ingestion?
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1:1 Mock Interview with a Senior DE
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- ✓ 60-minute video call
- ✓ Real-world system design questions
- ✓ Detailed written feedback report
- ✓ Resume review included
- ✓ Personalized 30-day prep plan