Flyway Database Migrations with Spring Boot
Learn how to use Flyway for versioned database migrations in Spring Boot applications with PostgreSQL.
Blog
21 posts on software engineering, systems, and learning.
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Spring JdbcClient
Learn how to use Spring JdbcClient for database operations with H2 and PostgreSQL in Spring Boot applications.
Spring Security Fundamentals: A Complete Guide
Master Spring Security from basics to advanced concepts - authentication, authorization, filters, and method-level security.
Spring Security JWT-based Authentication
Learn how to implement JWT-based authentication in Spring Boot using OAuth2 Resource Server, from generating RSA keys to securing REST APIs.
Spring Boot - Aspect Oriented Programming
Spring Boot AOP: Part 1 - Introduction to Aspect-Oriented Programming
A beginner-friendly introduction to Spring Boot AOP.
Spring Boot - Aspect Oriented Programming
Spring Boot AOP: Part 3 - CGLib vs JDK Proxies
Learn the differences between CGLib and JDK proxies.
Spring Boot - Aspect Oriented Programming
Spring Boot AOP: Part 2 - How AOP Actually Works Under the Hood?
Discover the magic behind Spring AOP.
Spring Boot - Aspect Oriented Programming
Spring Boot AOP: Part 4 - Simple AOP Project (Hands-On)
Build a simple Spring Boot AOP project from scratch. Learn by doing with a simple, practical example that adds transaction logging to a service method.
Spring Boot - Aspect Oriented Programming
Spring Boot AOP: Part 5 - @Around Advice and Custom Annotations
Learn how to use @Around advice to wrap method execution and create custom annotations.
ThreadLocal in Java: Per-Thread Variables Explained
Learn how ThreadLocal works in Java, why it matters, and how frameworks like Spring Security use it to store per-thread data without passing objects everywhere.
What Happens When You Type something.com in the Browser?
A comprehensive step-by-step breakdown of the entire journey from typing a URL to seeing a webpage. Perfect for system design interviews and understanding web fundamentals.
Designing Reliable APIs with Idempotency
Learn how to build APIs that handle retries gracefully without creating duplicate side effects. A practical guide to implementing idempotency in production systems.
Apache Kafka
Apache Kafka: Part 1 - Why Event Streaming Matters in Modern Applications
Discover why Apache Kafka has become the de-facto standard for real-time event streaming. Learn about the shift from batch processing to event-driven architectures and how Kafka powers modern businesses.
Apache Kafka
Apache Kafka: Part 2 - Understanding the Core Building Blocks
Deep dive into Kafka architecture - Messages, Topics, Partitions, Producers, Consumers, Brokers, and Clusters. Learn how these components work together to create a distributed event streaming platform.
Apache Kafka
Apache Kafka Part 3: Development Tools and APIs
Explore Kafka's powerful development tools including Producer API, Consumer API, Kafka Streams, Apache Flink, and Kafka Connect for building robust event-driven applications.
Apache Kafka
Apache Kafka Part 5: KRaft - The Future of Kafka Architecture
Discover KRaft (Kafka Raft), the revolutionary consensus protocol that eliminates ZooKeeper dependency and transforms Kafka cluster management.
Apache Kafka
Apache Kafka Part 4: Administration and Monitoring
Master Kafka cluster administration, monitoring strategies, performance tuning, and security management for production-ready deployments.
Microservices Design Patterns
Microservices Design Patterns: Part 1 - Breaking the Monolith
A practical guide to service decomposition patterns. Learn how to split monoliths into microservices the right way, with real-world examples from Amazon, Netflix, and Shopify.
OAuth 2.0
OAuth 2.0: Part 3 - Authorization Code Flow
Learn how to authenticate users using the Authorization Code Flow with Keycloak. A practical, hands-on guide with real examples.
OAuth 2.0
OAuth 2.0: Part 2 - Getting Keycloak Running
Learn how to set up and run Keycloak as your OAuth 2.0 authorization server. A practical, hands-on guide to get you started quickly.
OAuth 2.0
OAuth 2.0: Part 1 - Understanding the Basics
Learn the fundamentals of OAuth 2.0, understand authentication vs authorization, and see how OAuth 2.0 works with a real-world example.
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