Java backend developer who has built practical Spring Boot projects and keeps improving them.

I enjoy turning a backend idea into a small working system: model the domain, expose a REST API, persist data, write tests, and run it locally with Docker.

A completed Java 21 / Spring Boot learning project that simulates a payment lifecycle.

• REST API for creating and querying payments
• explicit payment state machine: pending → processing → completed / failed / cancelled / refunded
• idempotency checks for repeated requests
• PostgreSQL and Liquibase migrations
• Redis cache and Kafka events
• separate audit service
• Docker Compose, Testcontainers, GitHub Actions and smoke tests

This is a learning project. It does not process real payments or connect to a bank.

Java 21 · Spring Boot · Spring MVC · Spring Data JPA · Hibernate · PostgreSQL · Liquibase · Redis · Kafka · Docker · JUnit 5 · Mockito · Maven · Git

• springboot-web — online book store API with Spring Boot, MapStruct and Spring Data JPA.
• hibernate-liquibase — practice project for persistence and database migrations.
• jv-fruit-shop-tests — Java testing practice.

• writing clearer service and domain code
• integration testing with real infrastructure
• event-driven communication and reliable message delivery
• designing APIs that are easy to use and validate

These projects are part of my backend development journey, and I improve them step by step. 📫 obvly@icloud.com