System Design questions from Delivery Hero data engineering interviews.
These system design questions are sourced from Delivery Hero data engineering interviews. Each includes an expert-level answer. This set leans toward senior-level depth (2 of 3 are tagged hard). Recurring themes are join, partition, and window — these patterns appear most often in real interviews and reward the deepest preparation. Many of these questions also surface at Grover, so the preparation transfers across companies. Average answer is around 2 minutes of reading — plan roughly 1 hour to work through the full set thoughtfully.
This collection contains 3 curated questions: 1 easy, and 2 hard. The distribution skews toward harder problems, reflecting the depth expected in senior-level interviews.
The most frequently tested areas in this set are join (2), partition (2), window (2), optimization (1), and spark (1). 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. 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.
Briefly explain the architecture of Kafka.
How would you handle a schema change when new files arrive?
How would you design a cost-effective, scalable, and efficient data pipeline for an e-commerce website?
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