Spring Boot & Microservices Interview Guide
30+ in-depth Spring Boot and microservices interview questions with real code, drawn from 9+ years running these systems in production at fintech and airline-scale companies.
This isn't a list of definitions copied from documentation. Every answer here comes from systems I've actually run in production — fintech APIs at Oracle Financial Services, a 130-million-request-a-day platform at AirAsia, and the Spring Boot and Kafka infrastructure work documented elsewhere on this site. Where an interviewer asks "why," I've tried to answer with what actually breaks when you get it wrong, not just the textbook definition.
Five chapters, organized the way these interviews actually escalate: start with fundamentals, move into the parts that bite you in production, then into the distributed-systems and microservices-pattern questions that separate a mid-level answer from a senior one.