Microservices Interview- Essential Questions and Answers

Microservices Decomposition

Microservices Communications (Sync / Async Message-Based Communication, API Gateways)

Microservices Data Management (Databases / Query / Commands / Distributed Transactions)

Microservices Distributed Transactions

Microservices Deployments with Containers and Orchestrators

Microservices Resilience

API Gateway Pattern, Gateway Routing Pattern, Gateway Aggregation Pattern, Gateway Offloading Pattern, Backends for Frontends Pattern-BFF, Service Aggregator Pattern, Service Registry/Discovery Pattern

Single-receiver Message-based Communication (one-to-one model), Multiple-receiver Message-based Communication (one-to-many model-topic), Fan-Out Publish/Subscribe Messaging Pattern, Topic-Queue Chaining & Load Balancing Pattern

The Shared Database Anti-pattern, Relational and NoSQL Databases, CAP Theorem–Consistency, Availability, Partition Tolerance, Data Partitioning: Horizontal, Vertical and Functional Data Partitioning, Database Sharding Pattern

Materialized View Pattern, CQRS Design Pattern, Event Sourcing Pattern, Eventual Consistency Principle

Sidecar pattern, Service Mesh, Infrastructure as code (IaC), CI/CD pipelines

Retry pattern, Circuit Breaker Pattern, Bulkhead Pattern, Fallback Pattern, Strangler Fig Pattern

What does “design for failure” mean in a Microservices Architecture ?

If you design e-commerce application with microservices, Which services could be exist in your architecture ?

What are some patterns and best practices that are commonly used with asynchronous communication in microservices ?

What are some advantages of using HTTP and WebSocket for push and real-time communication in microservices ?

What are some advantages of using the publish/subscribe model and AMQP protocols for event-driven communication in microservices ?

How does using GraphQL in a microservices architecture compare to using traditional RESTful APIs ?

Which of the following use case best fit for gRPC usage in e-commerce microservices ?

What are the use cases of WebSocket API Usage in real-world scenarios ?

Which of the following is NOT typically a responsibility of an API Gateway ?

How does the API Gateway apply rate limiting in an microservices-based application ?

How Service Registry and Service Discovery is used together in microservices ?

If you design e-commerce microservice application, how you apply Publish/Subscribe Messaging Pattern ?

If you decide e-commerce databases, What is the data storage technology used by the inventory microservice that processes high-velocity streams of unstructured data ?

Why is the Shared Database principle considered an anti-pattern for microservices ?

Which type of database is best suited for a microservice that handles orders and transactions in an e-commerce system ?

How can the CAP theorem be applied in the design and implementation of microservices ?

How is database sharding pattern used to improve the performance and scalability of databases in microservices ?

When should the materialized view pattern be used in microservices ?

How can read and write databases be kept in sync in a CQRS architecture ?

Which of the following can be real-world use cases of microservices that use CQRS and Event Sourcing ?

How does distributed caching improve the performance of a system that uses microservices ?

What is the main disadvantage of cache miss in a distributed caching system for microservices ?

What is the advantage of using the saga pattern for implementing distributed transactions in microservices architecture ?

Which is the example of a real-world scenario where the saga pattern could be used in a microservices architecture?

In a choreography-based saga, who is responsible for coordinating the updates to the databases ?

What is the key responsibility of the central orchestrator service in an orchestration-based saga implementation ?

How can CDC and the transactional outbox pattern be used together in a microservice architecture ?

What is the role of service meshes in the communication and coordination of microservices ?

Why use Helm charts in Kubernetes for microservices deployments ?

When is the sidecar pattern typically used in microservices deployments ?

How can Infrastructure as code (IaC) be used with Kubernetes for microservices deployments ?

What is the built-in mechanism in Kubernetes for microservices health monitoring ?

When using the retry pattern, what is typically done after a temporary failure occurs ?

What is the Circuit Breaker Pattern ?

Which of the following is a microservices resilience pattern that helps prevent cascading failures ?

What are some advantages of using the Strangler Fig Pattern for migrating a monolithic application to microservices ?

What is the main advantage of using contract testing in a microservices architecture ?