A course on advanced object-oriented design and programming

Java record source generator

java Versioned Aggregate Tactical Pattern

Interactive flower shop bouquet builder. Demonstrates Java OOP design with enums, immutable value objects, service layer, and Stream-based statistics. Console app architected for Spring Boot REST API extension.

Spring PetClinic — DDD, rich domain, Hexagonal Architecture, CQRS, jOOQ, JDBC, JPA, JTE, full Testing Pyramid.

Console-based banking application built in Java — OOP, DDD, layered architecture