How do I approach Software Engineering Fundamentals interview questions?

Software Engineering Fundamentals questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master software engineering fundamentals interviews.

What difficulty level is this interview question?

This is a medium difficulty Software Engineering Fundamentals question, commonly asked during Technical Screen rounds at TikTok.

What role is this question designed for?

This question is commonly asked for Software Engineer candidates at TikTok during technical interviews.

Explain how Kafka works

Last updated: Mar 29, 2026

Quick Overview

This question evaluates understanding of Kafka and distributed streaming system concepts, covering core entities (broker, topic, partition, producer, consumer, consumer group), append-only message storage and offsets, scalability via partitioning, fault tolerance via replication and leader/follower roles, delivery semantics (at-most-once, at-least-once, effectively/exactly-once), ordering guarantees, and failure behaviors like broker/consumer failures and rebalancing. It is commonly asked to assess architectural reasoning about durability, throughput, ordering, and failure handling within the Software Engineering Fundamentals and distributed systems/messaging domain, testing both high-level conceptual understanding and practical application details.

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Explain how Kafka works

TikTok

Jan 22, 2026, 12:00 AM

mediumSoftware EngineerTechnical ScreenSoftware Engineering Fundamentals

Prompt

Explain how Apache Kafka works at a high level and then in more detail.

Cover at least:

Core entities: broker , topic , partition , producer , consumer , consumer group
How messages are stored (append-only log) and how offsets work
How Kafka achieves scalability (partitioning) and fault tolerance (replication, leader/follower)
Delivery semantics: at-most-once , at-least-once , and what is required for effectively/exactly-once processing
Ordering guarantees (what is ordered and what is not)
What happens during failures (broker failure, consumer failure, rebalance)

You may assume a typical multi-broker Kafka cluster.

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