Open to opportunities

Evgenii Buianov

@evgeniibuianov

I build high-performance Java microservices and modernize enterprise banking platforms.

I've built and modernized high-load Java systems for Bank CenterCredit, Crystal Spring, VTB, TRANSCAPITALBANK, and Prosoftex. My work spans Spring Boot and WebFlux microservices, REST/SOAP integrations, event-driven services, and enterprise Java modernization.

At Bank CenterCredit, I doubled document-workflow performance, reduced platform load by up to 9x, increased peak throughput by 20%, and cut production incidents by 30%. I'm currently leading backend architecture for a Java 21 microservices platform, including Kafka, PostgreSQL, Redis, AWS, CI/CD, and production observability.

Experience

Work history, roles, and key accomplishments

Current

Lead Backend Engineer

Current

Independent Startup Project

Sep 2025 - Present (1 year 1 month)

Architected a Java 21 / Spring Boot microservices platform with REST APIs, Kafka event flows, PostgreSQL, Redis, MinIO, Docker, and AWS. Designed service boundaries, persistence, caching, and secure authentication/authorization using Keycloak, OAuth2/OIDC, JWT, and role-based access controls.

Java 21+Spring Boot REST APIs Kafka PostgreSQL Redis Minio Docker AWS Keycloak OIDC JWT RBAC Jenkins GitHub Actions Prometheus Grafana Distributed Tracing

Software Engineer

Bank CenterCredit

Jun 2023 - Aug 2025 (2 years 2 months)

Designed and implemented Java 17 / Spring WebFlux microservices, secure REST APIs, and enterprise integration workflows using PostgreSQL, Redis, Kafka, MongoDB, Docker, and Kubernetes. Refactored a Camunda-based document-generation workflow, improving processing performance by 2x and reducing platform load by up to 9x.

Java 17 Spring WebFlux (Reactive)Microservices REST APIs PostgreSQL Redis Kafka MongoDB Docker Kubernetes Camunda Performance Optimization Monitoring Alerting

Java Developer

Crystal Spring

Jul 2022 - May 2023 (10 months)

Developed and supported Spring Boot microservices and REST APIs using MySQL and Redis for banking products. Configured Jenkins CI/CD pipelines and NGINX; improved deployment success from 85% to 97% through pipeline and artifact-versioning improvements.

Spring Boot Microservices REST APIs MySQL Redis Jenkins CI CD Nginx Multithreading Junit Linux

Software Engineer

VTB

Sep 2021 - Jun 2022 (9 months)

Developed Java REST and SOAP microservices for enterprise banking systems and operational integrations. Improved service stability through Prometheus/Grafana monitoring and collaborated with product and analytics teams in Agile delivery.

Java REST SOAP Microservices Prometheus Grafana Agile

Java Developer

TRANSCAPITALBANK

Nov 2020 - Aug 2021 (9 months)

Built secure REST integrations and legacy SOAP services for enterprise banking applications. Implemented asynchronous message flows using ActiveMQ and supported JBoss deployments with GitLab-based source control.

Java REST SOAP ActiveMQ JBoss Gitlab

Java Developer

Prosoftex

Jul 2019 - Oct 2020 (1 year 3 months)

Developed Java EE applications using Servlets, Hibernate/JPA, SQL, and Tomcat in an enterprise application environment. Supported HTML/JavaScript integration and wrote unit/integration tests using JUnit, SQL, and JPA.