Round 1: 1. API to API communication (REST) 2. API to API - Sync vs Async - How to process in Multi Threading environment? 3. Event driven communication between two REST APIs 4. MQ drive communication between two REST APIs 5. Microservices - Timeout error from backend APIs, how to handle? Resilience API? 6. Java 8 vs Java 11 vs Java 17? 7. Collections - How can you handle in multi threading environment? 8. How to create locks in Java? Spring boot vs Spring Web? When to use? Round 2: (client round) 1. More on Project based question (as per Resume) 2. Scenario based questions like how to handle exceptions in REST API (30X,40X,50X), timeout errors between APIs etc 3. Apache Kafka - Steps taken to eliminate producing duplicates at Kafka Broker/Topic/Partition? Is it possible? 4. Cassandra - Major diff. with Oracle/MongoDB, 5. Java Collections - How to handle exceptions while processing through Streams API (parallel and sequential) 6. Lead - How to handle team, deliverables if something goes wrong, any diff. situation you faced so far, etc.