• Scenario: Your team is adopting microservices. How would you apply Domain-Driven Design (DDD) concepts and patterns (like Bounded Contexts , Aggregates ) to define the boundaries and responsibilities of your ASP.NET Core microservices?

  • How would you combine the CQRS and Event Sourcing patterns in an ASP.NET Core microservice to handle complex state changes and provide different read models for querying?

  • As an architect , you need to decide between REST and gRPC for synchronous communication between new ASP.NET Core microservices . Discuss the trade-offs and design patterns influencing your decision based on different use cases (e.g., internal high-performance calls vs. public-facing APIs ).

  • Design the configuration management strategy for a dozen ASP.NET Core microservices deployed via Kubernetes . How would you implement the Externalized Configuration pattern , potentially using Kubernetes ConfigMaps/Secrets or a dedicated tool like Azure App Configuration ?

  • Scenario: You are migrating a legacy monolithic database to support a new microservices architecture using the Database-per-Service pattern . Outline the challenges and describe how patterns like Event Sourcing or Change Data Capture could be used to maintain data consistency during and after the migration . (Mid-Senior Level)

  • Scenario:AnASP.NET Coremicroservice (Service A) frequently calls another service (Service B) usingREST.Service Bsometimes experiences high latency or intermittent failures . Implement the Circuit Breaker and Retry patterns usingPollyinService Ato handle these issues gracefully.

  • Scenario: You need to implement a business process that involves updating data in three different microservices (e.g., Order , Inventory , Customer Credit ). Local ACID transactions aren't possible due to the Database-per-Service pattern. Design a solution using the Saga pattern (specify Choreography or Orchestration) in an ASP.NET Core context.

  • Describe different testing patterns for microservices , such as Service Component Tests and Consumer-Driven Contract Tests . How would you apply them in an ASP.NET Core project?

  • What is the Access Token pattern in the context of securing microservices communication ? How are JWTs often used?

  • Explain the Distributed Tracing pattern. How can tools like OpenTelemetry be integrated into ASP.NET Core microservices to trace requests across service boundaries?

  • Describe theLog Aggregation pattern. Why iscentralized logging crucialformicroservices, and whattools/techniquescan be used with ASP.NET Core?

  • Explain the Health Check API pattern . How do you implement health checks in ASP.NET Core microservices , and how can Kubernetes use them?

  • What is the Externalized Configuration pattern , and why is it essential for managing configurations in a distributed microservices environment ?

  • How does the Strangler Fig pattern facilitate the incremental migration from a monolithic application to ASP.NET Core microservices ?

  • Explain the Bulkhead pattern and how it helps prevent cascading failures in a microservices system. Expertise Level of Developer Required to Answer this Question

  • Describe the Retry pattern. How would you implement a Retry policy with exponential backoff using Polly in an ASP.NET Core HttpClient call? Expertise Level of Developer Required to Answer this Question

  • What is the Circuit Breaker pattern? How does it improve the resilience of ASP.NET Core microservices , and how can libraries like Polly help implement it?

  • Explain the Event Sourcing pattern. How does it relate to CQRS and eventual consistency ?

  • What is theCommand Query Responsibility Segregation (CQRS) pattern? How can it be applied to anASP.NET Core microservice, and what are thebenefits?

  • Explain theSaga patternfor managingdistributed transactions. Describe theChoreographyandOrchestrationapproaches and how you might implement them in.NET.

  • Describe asynchronous communication patterns (e.g., using message queues like RabbitMQ , Kafka , Azure Service Bus ) between ASP.NET Core microservices . What are the pros and cons ?

  • Describe synchronous communication patterns (e.g.,REST,gRPC) used betweenASP.NET Core microservices. What are thepros and cons?

  • Explain the Service Discovery pattern . How do client-side and server-side discovery differ, and how might you implement them in ASP.NET Core ?

  • How can you implement an API Gateway for ASP.NET Core microservices using tools like Ocelot or YARP ?

  • What are the key differences between theAPI Gateway patternand theBackend for Frontend (BFF) pattern? When would you chooseBFF?