Java Developer

Java Developer

1. Project & Role Ownership

• Explain project architecture and your contributions.
• Demonstrate end-to-end understanding of the system.
• Justify key architectural decisions.

2. Java Fundamentals

• Java 8, 17, 21 features (Streams, Lambdas, Collections).
• Java version differences and trade-offs.
• Performance vs readability considerations.

3. Databases & SQL

• Relational database concepts and SQL optimization.
• Stored procedures, views, triggers, and transactions.
• Database vs application-layer responsibilities.

4. Microservices & Event-Driven Architecture

• Microservice design principles.
• Synchronous vs asynchronous communication.
• Kafka-based messaging and scalability.

5. Kafka & Reliability

• Retry mechanisms, DLQ/DLT, and error handling.
• Message durability and fault tolerance.
• Designing production-ready asynchronous systems.

6. Distributed Systems

• Idempotency and duplicate message handling.
• Distributed transactions and Saga pattern.
• Consistency in event-driven applications.

7. Performance & Scalability

• Bottleneck identification and optimization.
• Database indexing and concurrency.
• Observability and system tuning.

8. Core Java & Data Structures

• Collections framework (HashMap, LinkedHashMap, TreeMap, etc.).
• Thread safety and concurrent collections.
• Time and space complexity.

9. OOP & Multithreading

• Serialization.
• Threads, Runnable, interfaces, and abstract classes.
• Core concurrency concepts.

10. Coding Assessment

• Algorithms and problem solving.
• Linked lists, arrays, and complexity analysis.
• Ability to explain approach and optimize solutions.

Mandatory Skills

• Java Backend Development
• Microservices & Kafka
• Database Design & SQL
• Distributed Systems
• Data Structures & Algorithms
• Communication & System Design
• Production Readiness for HealthTech/IoT