Oleg Ushakov

Technology stack: Java 8, Java 11, Spring 5, PostgreSQL, Hibernate, WebFlux, ActiveMQ, GitLab, Linux, SCRUM/Agile In a project for the largest retail operator in Russia, I developed a new application for improving the trade lifecycle model. I helped to migrate key components of the production system from a legacy solution to the modern reactive-based system without outages.

Technology stack: Java 7 and Java 8, Spring 4, JDBC, MySQL, ActiveMQ, Jira, Git, Linux I developed a main Enterprise Service Bus that had been created before. My team and I improved the performance and stability of the service. I integrated it with outer services and data sources.

My team and I designed architecture and realized backend services for providing inventory control, order service processing, and back-end services for our mobile application. I integrated the outer gate of payment service in our backend services to support the mobile application and POS terminal payments with credit cards. The company was creating a modern solution for the companies of HoReCa. It was a SaaS solution for business owners, and our mobile application worked for cafe employees and customers.

Technology stack : Java7, Spring MVC, Spring Core, Hibernate, JSP, MySQL, Git, JSON, REST I planned and built a backend module as a part of the global service system for a helpdesk. I made a system architecture, design a database structure, and implement API for integrating the application into the CMS.

Stack: - Java Core, Android SDK, JSON; - Google Maps, Push services, Parse.com DB; - Android Studio (Gradle), Jira, Confluence, Git, Mantis; - Retrofit2, Picasso, Otto, ButterKnife, MVP