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Microservices Interview Guide

Scenario-based interview preparation for microservices architecture and distributed systems.

This site is a practical interview guide covering microservices design patterns, resilience, communication, observability, and deployment — with concise, interview-ready answers.

Topic Map

mindmap
  root((Microservices\nArchitect\nPlaybook))
    Fundamentals
      Resilience and Fault Tolerance
        Circuit Breaker
        Bulkhead
        Fallback
      Service Communication
        gRPC vs REST
        API Gateway
        Idempotency
    Scalability and Data
      Performance and Scalability
        Latency · Auto-scaling
        Caching Strategies
      Data Consistency
        Saga Pattern
        Transactional Outbox
        Eventual Consistency
    Operations
      Observability
        Distributed Tracing
        Centralized Logging
        Metrics and Alerting
      Deployment
        Canary · Blue-Green
        Feature Flags
        API Versioning
    Architect Level
      Security
        OAuth2 and JWT
        mTLS · Zero Trust
      Spring Cloud
        WebClient · Feign
        Config Server
      Kubernetes
        Docker Best Practices
        Secrets Management
        Service Mesh
      Architecture Patterns
        Strangler Fig
        DDD · Bounded Context
        Sidecar · Outbox
      CI-CD and Team
        Jenkins Pipeline
        Tech Debt Strategy
        Incident Handling

Sections

Fundamentals

# Section Topics
1 Resilience & Fault Tolerance Circuit breakers, bulkheads, fallbacks, partial failures
2 Service Communication Retries, idempotency, gRPC, API Gateway, service mesh

Scalability & Data

# Section Topics
3 Performance & Scalability Latency, bottlenecks, auto-scaling, load distribution
4 Data Consistency Saga pattern, event deduplication, eventual consistency

Operations

# Section Topics
5 Observability & Debugging Distributed tracing, centralized logging, metrics
6 Deployment & Compatibility API versioning, canary deployments, feature flags

Architect Level

# Section Topics
7 Advanced Patterns CQRS, event sourcing, async APIs, saga orchestration
8 Security & Resilience4j OAuth2, JWT, mTLS, Spring Cloud Gateway, circuit breaker config
9 Spring Cloud & Frameworks WebClient, Feign, Config Server, Actuator probes
10 Containers & Kubernetes Docker best practices, K8s deployment, secrets, service mesh
11 Architecture & Design Patterns Strangler Fig, BFF, Sidecar, Outbox pattern, DDD decomposition
12 CI/CD & Team Leadership Pipelines, monolith migration, incident handling, tech debt

How to Use

Each section contains collapsible interview questions — click to expand the answer.

  • Answers are 2–5 lines, concise and interview-ready.
  • Questions are scenario-based: "Your system does X. How will you handle it?"
  • Hover over underlined terms for inline definitions.