Igor Z. Email & Phone Number

As Senior Backend Developer I have worked on an event-driven distributed CQRS/DDD project written in Kotlin (Spring Boot, Hibernate, Gradle, Kafka, Protobuf, Elasticsearch, GraphQL, REST API). Maintained several Java 8-17 and PHP projects. Improved application monitoring and Docker infrastructure.Significantly improved performance of company's product on application as well as server side. Reduced MySQL CPU usage by two. Solved deadlock problems. Improved Kafka cluster stability. Hosted company-wide inspiring workshops about how to monitor and improve performance.Other technologies I worked with: Kubernetes cluster in Azure, GitLab pipelines, Kibana, Grafana, Sentry, statsd, GraphQL, Kanban/Jira.

New feature development, legacy code refactoring (I like both). Led several big projects in collaboration with other Backend, Frontend developers and Infrastructure Team. Full cycle of project development: from discussing the concept with PO to infrastructure roll-out and code deployment to production.Worked on monolith to microservices migration. Got hands-on experience with RabbitMQ HA cluster. Created CI/CD pipelines in Jenkins, sped up unit test pipelines by the factor of 10. Dockerized projects, introduced Makefiles, worked on migration to Amazon AWS. Provided Infrastructure-as-code using Ansible and Terraform.Mentored and educated the team, introduced new approaches and technologies. Strove for Clean Code (OOP, SOLID) and Clean Architecture (Ports and Adapters, Onion/Layered, DDD). As a result, the overall code quality and team skills significantly improved.Extensively worked with: SOA/Microservices, REST API, JSON, SOAP, High Availability, Automated tests, Doctrine ORM, Symfony, MySQL, Redis, Memcahce, HAProxy, Jira, Confluence.