Here’s a list of 100 topics you should review for a Senior Java Developer interview:

01 - Core Java (20 Topics)

  1. Object-Oriented Programming (OOP) Principles (Audio YES)
  2. Java Memory Management (Heap, Stack, GC) (Audio YES)
  3. Java 8+ Features (Streams, Lambda, Functional Interfaces, Optional) (Audio YES)
  4. Exception Handling (Checked vs Unchecked Exceptions) (Audio YES)
  5. Java Collections Framework (List, Set, Map, Queue) (Audio YES)
  6. Concurrency & Multithreading (Executors, Fork/Join, Locks) (Audio YES)
  7. Immutability & Best Practices (Audio YES)
  8. Java Serialization & Deserialization (Audio YES)
  9. Reflection API & Dynamic Proxy (Audio YES)
  10. Generics in Java (Audio YES)
  11. Enums & Best Practices (Audio YES)
  12. Records & Sealed Classes (Java 14+) (Audio YES)
  13. Java I/O (Files, Streams, Readers/Writers)
  14. JDBC & Database Connectivity
  15. Annotations & Meta-Annotations (Audio YES)
  16. Weak References, Soft References, Phantom References (Audio YES)
  17. Comparing Objects (equals(), hashCode(), Comparable, Comparator) (Audio YES)
  18. Class Loaders & Classpath Management
  19. Java Modules (Jigsaw)
  20. Java Performance Optimization

02 - Spring Framework & Microservices (20 Topics)

  1. Spring Core (DI, Bean Lifecycle, ApplicationContext) (Audio YES)
  2. Spring Boot (AutoConfiguration, Starters)
  3. Spring MVC (REST API, Request Mapping, Interceptors) (Audio YES)
  4. Spring Security (Authentication, Authorization, JWT) (Audio YES)
  5. Spring Data JPA (Repositories, Query Methods, Entity Relations) (Audio YES)
  6. Spring Transactions & @Transactional (Audio YES)
  7. Spring AOP (Aspect-Oriented Programming)
  8. Spring Actuator & Metrics
  9. Spring Cloud (Config Server, Service Discovery, Circuit Breakers)
  10. API Gateway (Spring Cloud Gateway, Zuul)
  11. Service-to-Service Communication (Feign, RestTemplate, WebClient) (Audio YES)
  12. Message Brokers (RabbitMQ, Kafka, ActiveMQ) (Audio YES)
  13. Microservices Patterns (Saga, CQRS, Event Sourcing) (Audio YES)
  14. Distributed Tracing (Zipkin, Sleuth)
  15. API Versioning & Documentation (Swagger, OpenAPI) (Audio YES)
  16. Kubernetes & Docker for Microservices
  17. Spring Batch & Scheduled Tasks
  18. Circuit Breakers (Resilience4J, Hystrix)
  19. WebSockets in Spring
  20. Spring GraphQL
  21. Spring IOC

03 - Databases & Persistence (10 Topics)

  1. SQL Queries & Performance Tuning
  2. Indexing & Query Optimization
  3. NoSQL Databases (MongoDB, Redis, Cassandra)
  4. Caching Strategies (Redis, EhCache, Caffeine)
  5. Connection Pooling (HikariCP, C3P0)
  6. Transactions & Isolation Levels (Audio YES)
  7. Hibernate & Lazy/Eager Loading (Audio YES)
  8. Database Schema Design & Normalization
  9. Liquibase & Flyway for Database Migrations
  10. Read vs Write-Optimized Database Design

04 - Concurrency & Multithreading (10 Topics)

  1. Thread States & Lifecycle (Audio YES)
  2. Synchronization & Thread Safety (Audio YES)
  3. Executor Framework & Thread Pools
  4. CompletableFuture & Asynchronous Programming
  5. Deadlocks, Race Conditions, Starvation
  6. Java Concurrency Utilities (CountDownLatch, Semaphore, CyclicBarrier)
  7. Locking Mechanisms (ReentrantLock, ReadWriteLock)
  8. Atomic Variables & Concurrent Data Structures
  9. Non-blocking Algorithms (Compare-And-Swap)
  10. Virtual Threads (Project Loom)

05 - Design Patterns & Best Practices (10 Topics)

  1. SOLID Principles (Audio YES)
  2. Gang of Four (GOF) Design Patterns (Audio YES)
  3. Factory, Singleton, Builder, Prototype, Decorator, Proxy
  4. Dependency Injection & Inversion of Control
  5. Event-Driven Architecture
  6. Domain-Driven Design (DDD)
  7. API Design Best Practices
  8. Clean Code & Code Smells
  9. Hexagonal Architecture (Audio YES)
  10. Test-Driven Development (TDD)

06 - DevOps, CI/CD & Cloud (10 Topics)

  1. CI/CD Pipelines (Jenkins, GitHub Actions, GitLab CI)
  2. Docker (Containers, Docker Compose)
  3. Kubernetes (Pods, Services, Deployments)
  4. Logging & Monitoring (ELK Stack, Prometheus, Grafana)
  5. Cloud Services (AWS, GCP, Azure)
  6. Infrastructure as Code (Terraform, Ansible)
  7. API Gateway & Load Balancing (NGINX, Traefik)
  8. Serverless Computing (AWS Lambda, Azure Functions) (Audio YES)
  9. Kubernetes Service Mesh (Istio, Linkerd)
  10. Blue-Green & Canary Deployments

07 - Security & Performance (10 Topics)

  1. OWASP Top 10 Security Vulnerabilities
  2. Secure Authentication & Authorization (OAuth2, OpenID Connect) (Audio YES)
  3. Secure Coding Best Practices
  4. JWT, SAML, and Session Management
  5. CSRF & CORS in APIs
  6. Rate Limiting & API Throttling
  7. SSL/TLS & Certificate Management
  8. Performance Testing (JMeter, Gatling)
  9. Profiling & Benchmarking (JVisualVM, YourKit)
  10. Load Balancing & Failover Strategies

08- Bonus Topics (10 Topics)

  1. Reactive Programming (Project Reactor, RxJava)
  2. Event-Driven & Serverless Architectures (Audio YES)
  3. WebSockets & Real-Time Applications
  4. GraphQL vs REST APIs (Audio YES)
  5. gRPC & Protocol Buffers
  6. Kubernetes Operators & Helm Charts
  7. Functional Programming in Java (Audio YES)
  8. WebAssembly & Java Interoperability
  9. AI/ML Integrations with Java (TensorFlow, DL4J)
  10. Latest Java Roadmap & Future Features