Development of a web portal for combining the efforts of volunteers, non-profit organizations, and sponsors on one platform with a user-friendly interface and new online technologies.Developing multi-module Gradle/Spring Boot application• implementation of features on Backend using Spring Boot/Hibernate.• implementation and testing REST controllers, saving to database using Spring DATA-JPA.• frontend implementation (Thymeleaf, Bootstrap(CSS/JS)).

• Writing the code using Java and Spring-based on the desired output results described by users and thenecessary data input, using algorithms, and necessary data structures.• Developing the logic of tables relationships based on the customer’s business structure.• Writing the query code for complex samples using Hibernate or Spring DATA• Changing a web interface using Thymeleaf /Freemarker and Bootstrap• Coding the unloading of data from the database (PostgreSQL) in the format XLS or CSV• Unit testing for the code I wrote (all levels: repositories, services, controllers) using JUnit and Mockito(using H2 database for tests)• Interfaced with other team members using Agile scrum methodology to gather requirements for thecode

Back-end Java developer in a project for a cross-platform financial system. The system is divided intomicroservices.• Implementation of functionality• Specifying and handling Exceptions• Writing queries to the database• Writing unit tests, Bug fixes

Creating a multi-level web application:• Develop an application model using a 3-layer architecture• Using Maven in creating, developing and deployment the application• Creating a Postgresql database using the version control system Liquibase• Test the application• Switch the app to using Spring Boot