Egor Rybakov

- Developing new microservices in a document management system using Java 11-17, GraphQL, Spring Boot, Spring Security, Spring Data JPA, PostgreSQL, Kafka and Keycloak. - Conducted technical research, wrote design documents and tasks for other developers. - Designed and implemented an authentication and authorization system for a microservice using OpenID Connect and Keycloak.

- Developing a real-time event processing system from scratch that integrates with cryptocurrency exchanges using Java 11, Spring Boot, Kafka and WebSocket. - Built a highly configurable custom testing tool that allows emulating crypto exchanges and generating up to 500k messages per second for load testing. - Designed and implemented an asynchronous persistent client-side rate limiter using Bucket4j.

- Developed and maintained an automated loan processing microservice system using Java 8-11, Spring Framework, Spring Boot, Oracle, PostgreSQL, Camunda, Kafka, Docker, Openshift. - Migrated the system from Oracle to Greenplum, rewriting most of the SQL scripts and adding custom implementations of MERGE/UPSERT operations.

- Worked on a system with complex domain logic that forecasts demand and manages warehouse stocks. - Implemented a new algorithm of rounding an order by packages, which allowed customers to distribute their stock by different types of packaging and not lose money on leftovers.