Core Concepts

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Solid Principle

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How can you choose right collection for your work in Java

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What Really Happens When You Add @SpringBootApplication?

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Spring Boot Core Concepts

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Spring WebFlux and Reactive Programming

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WebSockets in Java: Threading, Scaling, and Virtual Threads

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System Design

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Back-of-the-Envelope Estimation

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Architecture

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Domain-Driven Design Basics

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Microservices Architecture Fundamentals

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Event-Driven Architecture Patterns

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Dependency Injection and Inversion of Control

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Kafka

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Apache Kafka Concepts

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Kubernetes

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Kubernetes Deployment Pipeline (Local Machine → Production)

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Databases

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MySQL EXPLAIN ANALYZE vs EXPLAIN

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Postgres GIN Indexes for JSONB Containment Queries

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Tooling

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git worktree Lets You Check Out Multiple Branches at Once

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AI/LLM

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AI-Assisted Development and Agentic Workflows

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Changes In

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Java

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From 11 to 17

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From 17 to 21

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