Contributed to the eugenp/tutorials repository by developing two core features over a two-month period, focusing on robust data persistence and content rendering. Built a DateTime values persistence layer using Java, JPA, and PostgreSQL, introducing a dedicated entity and repository to ensure accurate storage and retrieval of Java date and time types, with comprehensive integration and end-to-end tests to verify behavior. Later, implemented an article rendering system leveraging Spring Boot and JTE templating, creating reusable components for HTML generation and validating output with unit tests. The work emphasized maintainability, test coverage, and alignment with modern Java and template rendering practices.