Participation in the development of Spring/ JPA Enterprise application with authorization and role-based access rights on the stack: Maven, Spring MVC, Spring Security, REST (Jackson), Java 8 Stream API. Persistence to Postgres and HSQLDB databases using Spring JDBC, JPA(Hibernate) and Spring-Data-JPA. Implementation and testing REST and AJAX controllers (more than 100 JUnit5 tests). Development of the web-client using Bootstrap (CSS/JavaScript)