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Kafka interview questions and answers.

Kafka comes up in backend interviews whenever the role touches event-driven architecture, asynchronous processing, or high-throughput integration between services. This page highlights the Kafka concepts that interviewers most often use to test practical systems thinking.

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Why Kafka questions matter

Kafka interview questions are usually not just about message brokers in general. They test whether you understand partitioning, ordering, consumer group behavior, retries, duplicates, lag, and the operational side of event pipelines. Those details matter because distributed systems bugs often appear in exactly these edges.

Strong answers usually combine the model with trade-offs. For example, you should be able to explain when Kafka preserves order, what "at least once" really means for business logic, and why idempotent consumers still matter even when the platform offers delivery guarantees.

Representative Kafka interview questions

  1. What problem does Kafka solve?
  2. What is the difference between a topic and a partition?
  3. How does message ordering work in Kafka?
  4. What are offsets and who manages them?
  5. What is a consumer group?
  6. What happens during a rebalance?
  7. What is the difference between at most once, at least once, and exactly once delivery?
  8. What is the purpose of retention in Kafka?
  9. How do retries and dead-letter topics work?
  10. How would you design an idempotent Kafka consumer?

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