🔥 Java Backend Interview Questions (4+ Years Experience) Preparing for product-based companies? Here are some NEW trending interview questions for Java + Spring Boot + Microservices developers 👇 💡 Core Java 1️⃣ What is the difference between fail-fast and fail-safe iterators? 2️⃣ How does ConcurrentHashMap achieve thread safety internally? 3️⃣ What is the difference between Callable and Runnable? 4️⃣ Explain volatile keyword and happens-before relationship 5️⃣ What is Optional in Java 8 and when should you avoid using it? 💡 Spring Boot & Microservices 6️⃣ How does Spring Boot starter dependency work internally? 7️⃣ What is the role of @Transactional and its propagation types? 8️⃣ How does service discovery work (Eureka / Consul)? 9️⃣ What is idempotency in REST APIs? 🔟 How do you handle API versioning in microservices? 1️⃣1️⃣ What is rate limiting and how do you implement it? 1️⃣2️⃣ What is Saga pattern in microservices? 💡 System Design (Must for 4+ Years) 1️⃣3️⃣ Design a notification system (Email + SMS + Push) 1️⃣4️⃣ How would you design a real-time chat system? 1️⃣5️⃣ How do you design a logging & monitoring system? 1️⃣6️⃣ How would you handle high concurrency in ticket booking system? 💡 AWS & Cloud 1️⃣7️⃣ What is difference between SQS vs SNS? 1️⃣8️⃣ What is autoscaling and how it works in AWS? 1️⃣9️⃣ What is CloudWatch and how is it used? 2️⃣0️⃣ What is difference between vertical vs horizontal scaling? 💡 Docker & DevOps 2️⃣1️⃣ What is Docker networking? 2️⃣2️⃣ What is Kubernetes and why is it used? 2️⃣3️⃣ What is rolling deployment vs blue-green deployment? 2️⃣4️⃣ What is container orchestration? 💡 Database & Performance 2️⃣5️⃣ What is deadlock and how to prevent it? 2️⃣6️⃣ What is normalization vs denormalization? 2️⃣7️⃣ What is sharding in databases? 2️⃣8️⃣ What is CAP theorem in distributed systems? ⸻ 🎯 Tip: Focus more on System Design + Microservices + Concurrency — most interviews are now scenario-based 🚀 Join our developer community 👇 👉 https://lnkd.in/dH3ywQQS 💬 Comment “JAVA” if you want a full list of 100+ interview questions ⸻ #Java #SpringBoot #Microservices #AWS #Docker #Kubernetes #SystemDesign #BackendDeveloper #InterviewPreparation
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