- Enhanced customers' BI by establishing 18 % more accurate statistics utilizing Java, Spring Boot, Spark, ClickHouse implementing a weighting math approach on a 10 TB dataset- Built backend for a web application with 26 microservices on Spring Boot, Docker, Kubernetes, AWS EKS - Guided 3 new developers during onboarding through Scrum cycle and CI/CD tools for best practices on writing efficient and bug-free code with Jenkins, JUnit, Cucumber, Selenium- Raised UI interaction speed… Show more - Enhanced customers' BI by establishing 18 % more accurate statistics utilizing Java, Spring Boot, Spark, ClickHouse implementing a weighting math approach on a 10 TB dataset- Built backend for a web application with 26 microservices on Spring Boot, Docker, Kubernetes, AWS EKS - Guided 3 new developers during onboarding through Scrum cycle and CI/CD tools for best practices on writing efficient and bug-free code with Jenkins, JUnit, Cucumber, Selenium- Raised UI interaction speed by 12 % faster answering of a backend introducing async work of 11000 users and applying RabbitMQ messaging, REST, Docker, Spring Boot Show less

- Refactored monolithic app backend to microservices-layer design with REST, Spring Boot, Docker, JUnit, AWS ECS, which saved user 30% of the time to go through UI flow- Engineered resilient Spring-based services belt for efficient Big Data interactions using Docker, Spark, ClickHouse empowering network knowledge by 7% with QoS statistics- Kick-started prototype web app in 1 month using Spring Boot, Vaadin, Hibernate, AWS LightSale/BeansTalk/EC2 resulting 2 new clients landing for… Show more - Refactored monolithic app backend to microservices-layer design with REST, Spring Boot, Docker, JUnit, AWS ECS, which saved user 30% of the time to go through UI flow- Engineered resilient Spring-based services belt for efficient Big Data interactions using Docker, Spark, ClickHouse empowering network knowledge by 7% with QoS statistics- Kick-started prototype web app in 1 month using Spring Boot, Vaadin, Hibernate, AWS LightSale/BeansTalk/EC2 resulting 2 new clients landing for customer Show less

HireRight project, TOP-3 US applicant background check- Elevated SLA of the product by 0.004% after implementing 5 feature toggles with Spring Boot, Docker, SQL, JUnit to adapt business rules in production without redeployments- Bolstered the team by hiring a Java developer with a PhD in STEM after providing technical evaluations of 11 applicants- Established system audit by saving 14 tracks on each of 5 flows and several thousands of users with Oracle DB, Hibernate, Spring… Show more HireRight project, TOP-3 US applicant background check- Elevated SLA of the product by 0.004% after implementing 5 feature toggles with Spring Boot, Docker, SQL, JUnit to adapt business rules in production without redeployments- Bolstered the team by hiring a Java developer with a PhD in STEM after providing technical evaluations of 11 applicants- Established system audit by saving 14 tracks on each of 5 flows and several thousands of users with Oracle DB, Hibernate, Spring Security, JUnit, JS, achieving US Law compliance Show less

- Increased report responsiveness by 9% with a refactoring of windowing functions of a statistical subsystem: Vaadin, Java, Spring, Bash, SQL, MariaDB ColumnStore on 1 TB set- Boosted DB installation 2 times after automation with Liquibase, Tomcat, Spring, Maven and structuring overlapped tables in MySQL

- Provided 4 software deployments using Bash, Tomcat, MySQL with 99.99 % SLA preserved- Accelerated report preparation to 3 times faster with PhantomJS, JavaScript, CSS by automation of data and pictures export to Excel file