• As a Tech Lead/Architect , how would you choose the appropriate communication technology ( REST vs gRPC vs Messaging ) for different interactions between your ASP.NET Core microservices , considering factors like performance , coupling , and consistency requirements?

  • Scenario: You need to implement a query that requires data from three differentASP.NET Core microservices. How would you approach this? Compare strategies likedirect calls,data aggregation in the API Gateway, or using adedicated query service (CQRS read model). Mid Level

  • Scenario: Yourmicroservices applicationexperienceshigh traffic, and certain services becomebottlenecks. Describe how you wouldidentifythesebottlenecksusingmonitoring toolsandscalethe specificASP.NET Core microservicesusingKubernetes.

  • How would you design a deployment pipeline ( CI/CD ) for an ASP.NET Core microservice using Docker , Kubernetes , and potentially Azure DevOps or GitHub Actions ?

  • Scenario: You are decomposing a large monolithic ASP.NET application into microservices. How would you approach the database decomposition? Discuss the challenges and potential strategies (e.g., Strangler Fig pattern, shared database initially, event-driven sync).

  • Design the security architecture for a set of ASP.NET Core microservices exposed via an API Gateway. How wouldauthenticationwork, and how woulduser identity/permissionsbepropagated securelybetween services?

  • Scenario: An ASP.NET Core microservice needs to call another downstream service synchronously. This downstream service is occasionally slow or unavailable. How would you implement resilience patterns (like Retry and Circuit Breaker) using Polly to prevent cascading failures?

  • Scenario: You need to design a system where an action in one microservice (e.g., Order Placement) triggers actions in multiple other microservices (e.g., Inventory Update, Notification Sending) reliably. How would you architect the communication and ensure eventual consistency using ASP.NET Core ?

  • How do you handle versioning for your ASP.NET Core microservice APIs?

  • What does "idempotency" mean in the context of microservice APIs, and why is it important, especially with patterns like Retry?

  • Explain Domain-Driven Design (DDD) and how concepts like Bounded Contexts can help in decomposing a monolith into microservices.

  • What is Consumer-Driven Contract Testing , and how can it help ensure compatibility between microservices?

  • What are effective strategies for testing individual ASP.NET Core microservices (unit, integration) and the system as a whole (end-to-end, contract testing)? Expertise Level: Mid-Level/Senior

  • How do you approach monitoring and health checks for ASP.NET Core microservices ?

  • Explain the importance of distributed tracing in microservices. How can you implement it in an ASP.NET Core environment (e.g., using OpenTelemetry, Application Insights, Jaeger)?

  • What strategies would you use for logging across multiple ASP.NET Core microservices ? How can you achieve centralized logging (e.g., using ELK stack , Seq , Splunk )?

  • How do you handle authentication and authorization in a microservices architecture where requests might span multiple services? Discuss token propagation (e.g., JWT) and centralized identity providers.

  • How do you manage configuration for multiple ASP.NET Core microservices? Discuss strategies for centralized configuration (e.g., Azure App Configuration, Consul KV, Spring Cloud Config).

  • How can Kubernetes be used to orchestrate and manage containerized ASP.NET Core microservices ? Explain concepts like Pods , Services , Deployments , and Ingress .

  • Explain how you would containerize an ASP.NET Core microservice using Docker . What are the key elements of a Dockerfile for an ASP.NET Core application?

  • How does the Circuit Breaker pattern work , and why is it crucial for inter-service communication stability ?

  • What are common resilience patterns used in microservices (e.g., Retry, Timeout, Circuit Breaker)? How can you implement these inASP.NET Core, potentially using libraries likePolly?

  • Explain the CQRS (Command Query Responsibility Segregation) pattern. How can it be applied within an ASP.NET Core microservice?(Expertise Level: Expert)

  • Explain the Saga pattern for managing distributed transactions in a microservices architecture . How might you implement this in a .NET context ?

  • How do you handledata consistencyacrossmultiple microservicesin an ASP.NET Core application? Explain concepts likeEventual Consistency.