Reactive Java applications on Spring Webflux, microservices architecture. Developing new features and supporting existing services.

Tech stack: Spring Boot, Java 11, 17; Kotlin, Kafka, RabbitMQ, PostgreSQL, Webflux/react, Apache cxf, etc Project in a microservice architecture, which works with many existing systems, integrations (REST API, SOAP API) and data. Migration of data from old systems, hyper tables for storing large data. Database normalization, indexing and query optimization. WebSocket via RabbitMQ broker. Data flow through Kafka. Used Postgresql extensions to work with maps (Postgis, postgis_topology, etc). A year later, they offered the position of Team Lead, whose responsibilities included overseeing all services, integration and buses. Many interesting solutions and technologies were introduced into the system. The project is interesting because there are a lot of calculations of routing, state of locomotives based on sensors, optimization of fuel and electricity consumption, monitoring and analysis of big data, etc.

Designing and developing backend application on microservices architecture. Tech stacks: java, kotlin, spring boot framework, hibernate, postgres, oracle, AWS, etc.

Built a cross-platform web application with Spring Boot and Angular from scratch. Tech stack Java, Spring, Hibernate, PostgreSql, Docker, Kubernates.

Participated in the implementation of the smart wallet and business eco system. Responsible for core logic of emoney transactions in the system, integrations with e-commerce and banks such as Halyk, BCC, acquirings Processing, MasterCard and etc. Contributed and participated in all phases of the development lifecycle with Spring Framework, Relational Database, SQL and ORM technologies. Focusing on writing well-designed, testable and efficient code.

Developing desktop application on JavaFX, implementation different types of services on Java, integration front and back-ends, databases

Functional and load testing (Junit and Jmeter), developing customer - oriented services on Java, record-keeping (ireport, Business Intelligence System),web front-end(Bootstrap, kickstart, ractive, matreshka), REST service.

Technical documentation management, preparing of technical specifications, daily reports