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Top Microservices Tricky Interview Questions You Should Know (With Answers)

Ramesh Fadatare
JavaGuides
Published in
6 min readFeb 15, 2025

Microservices architecture has become the standard for building scalable and maintainable applications. However, working with microservices introduces several complexities, such as event-driven communication, distributed transactions, service discovery, and API management.

For non-members, read this article on my blog for free: Top Microservices Tricky Interview Questions You Should Know (With Answers).

If you’re preparing for a microservices interview, you need to be ready for tough and tricky questions. This guide covers seven essential interview questions along with detailed answers and real-world solutions.

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1. Handling Idempotency in Payment Service Using Kafka

Question:

You have two microservices: Order Service and Payment Service. When an order is created, the Order Service publishes an event to Kafka, and the Payment Service listens to that event. However, the payment service sometimes processes the message twice due to retries caused by consumer failure. How would you handle idempotency to prevent duplicate processing in Payment Service?

Solution:

To prevent duplicate processing, use idempotency keys (Unique Transaction ID) and check if…

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