JVM internals, Concurrency, Virtual Threads, Collections
🍃Spring Boot
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AOP, Data JPA, Security, Cloud, WebFlux
🏗️System Design
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Kafka, Distributed Sagas, 2PC, CQRS, High-Scale
☸️DevOps & K8s
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Docker, Pod Lifecycles, GitOps, Observability
🗄️Database & Storage
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ACID, WAL, MVCC, B-Trees, Cassandra, Redis
🔐Core Security
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JWT Revocation, OAuth2, PKCE, Rate Limiting