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Top Microservices Interview Questions and Answers for Experienced Professionals
If you are a beginner, check out the top 30 microservices interview questions and answers for freshers.
In this article, we will discuss 25 microservices interview questions and answers for experienced professionals.
1. What is the role of the API Gateway in microservices architecture?
An API Gateway acts as the single entry point for all client interactions with a microservices-based application. It manages request routing, protocol translation, and response aggregation. It also handles authentication, logging, rate limiting, and caching, offloading these responsibilities from individual services.
By centralizing cross-cutting concerns, an API Gateway simplifies client-side logic and reduces coupling between external clients and internal services. Tools like Zuul, Spring Cloud Gateway, and Kong are commonly used in production.
➡️ API Gateway Pattern in Microservices — A Complete Guide
2. How do you ensure data consistency in a microservices environment?
In microservices, achieving strong consistency across services is complex due to distributed data management. Instead, most systems use eventual consistency, where services sync over time using asynchronous messages.
Techniques like the Saga pattern, Change Data Capture (CDC), and event-driven architecture help maintain data integrity. Proper handling of retries, deduplication, and idempotency is also crucial.
3. Explain the Saga pattern in microservices.
The Saga pattern is used for managing distributed transactions across microservices. It breaks down a transaction into a series of smaller local transactions that execute in a defined sequence.
Each step in the Saga is followed by an event or command to trigger the next service. In case of failure, compensating actions are executed to undo previous changes. Sagas can be orchestrated (central controller) or choreographed (event-driven).
➡️ Saga Pattern in Microservices: A Step-by-Step Guide
