Real questions asked in Google data engineering interviews. Covers BigQuery, GCP, SQL, system design, and data pipeline architecture.
Google's data engineering interviews emphasize BigQuery, Dataflow, Pub/Sub, Cloud Storage, and SQL at scale. These questions come from actual Google interview loops and cover technical depth, system design for petabyte-scale data, and best practices for GCP-native data platforms.
This collection contains 11 curated questions: 4 easy, 3 medium, and 4 hard. The balanced mix of difficulties makes this set suitable for engineers at any career stage.
The most frequently tested areas in this set are join (4), optimization (4), partition (4), bigquery (3), spark (3), and etl (2). Focusing on these topics will give you the highest return on your preparation time.
Start with the easy questions to warm up and solidify fundamentals. Medium-difficulty questions form the bulk of real interviews — spend the most time here and practice explaining your reasoning out loud. Hard questions often appear in senior and staff-level rounds; attempt them after you're comfortable with the basics. For each question, try answering before revealing the solution. Use our AI Mock Interview to simulate real interview conditions and get instant feedback on your responses.
Compare Airflow's @daily vs once trigger scheduling.
Design a daily ETL pipeline to ingest API data into BigQuery.
Design a real-time data pipeline for clickstream events. How to ensure fault tolerance? Where to implement deduplication logic? How to efficiently store 1 billion+ rows?
Handle midstream schema changes gracefully.
Handle schema evolution in production.
How do you handle conflict with a product manager?
Process a large log file (in GBs) to identify the top 10 users by event frequency. Optimize for memory efficiency and handle streaming input.
Share a situation where you took ownership of a failing project.
What actions did you take when a deadline was missed due to code errors?
What excites you about working at Google?
What is your motivation to join Google?
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