- Developed a REST API service for generating directories with internal authorization and access rights based on roles, authorization via LDAP on the stack: JDK 11, Spring Boot 2, Spring Framework, Spring Security, Spring DataJPA, PostgreSQL, JPA(Hibernate), JOOQ, Junit 5, Lombok, Gradle, Swagger/OpenAPI 3.0.- Developed a REST API service for the client’s CRM system with internal authorization and role-based access rights, authorization via LDAP on the stack: JDK 21, Spring Boot 3, Spring Framework, Spring Security, Spring DataJPA, PostgreSQL, JPA(Hibernate), Elasticsearch, Junit 5, Lombok, Gradle, Swagger/OpenAPI 3.0.

- Developed a plugin for Jira.- Developed automation using ScriptRunner and scripts using Groovy.- Administered and supported Atlassian software products for the customer.

- Supported and automated the sales unit, compiled instructions and technical documentation for the developed subsystems and modules.- Integrated 1C CRM via API with external systems.

- Developed a Spring/JPA Enterprise application with authorization and access rights based on roles on the stack: Spring Framework, Spring MVC, Spring Security, REST(Jackson), Java 8 Stream API, Apache Maven, PostgreSQL, HSQLDB, Spring JDBC, JPA (Hibernate ) and Spring Data JPA, JUnit/Mockito. Client implementation using Bootstrap (css/js), datatables, jQuery + plugins. Migration to JDK 17, Spring Boot 3, Lombok, H2, Swagger/OpenAPI 3.0.Github: https://github.com/avf-hub/topjava.- Developed the web application "Resume Database" - implementation of saving resumes in memory based on an array, sorted array, list and associated array (Map), in the file system (File API and Java 7 NIO File API), in standard and custom serialization Java, in JSON (Google Gson) and XML (JAXB) format, in the PostgreSQL relational database. Client implementation using servlet and JSP/JSTL technologiesGithub: https://github.com/avf-hub/basejava- Developed a backend REST application for organizing online voting on the stack: Spring/Spring Boot, Spring Data JPA, H2, ehCache, Spring Security, JUnit/Mockito.Github: https://github.com/avf-hub/restaurant-voting

- Integrated the CRM module based on 1C:ERP with other IT systems of the company.- Finalized the CRM module for the customer’s tasks and compiled instructions for working with it.

- Finalized configurations for the customer’s tasks and compiled instructions for the developed modules.- Integrated 1C with other IT systems of the holding.

- Administered MS Windows Server 2012-2016, gateway to OS Linux, PostgreSQL, MSSQL, enterprise website.- Provided technical support to users.- Supported 1C databases in the organization.