Open to opportunities

Sergey Shestakov

@sergeyshestakov

I build reliable Java backend workflows for high-volume business operations.

I've built backend workflows at DataArt for corporate customer onboarding, including submission, external checks, status updates, and downstream communication. I reduced applications stuck in an intermediate state to zero during post-release monitoring by building a recovery flow for failed external checks.

Previously at EPAM and SKB Kontur, I developed order-processing and B2B application workflows, added idempotent Kafka event handling, and improved validation, status recalculation, and failure investigation. I work with Java, Spring Boot, PostgreSQL, Kafka, Docker, automated testing, and production observability to make business-critical services easier to operate and recover.

Experience

Work history, roles, and key accomplishments

Current

Java Backend Developer

Current

DataArt

Oct 2024 - Present (1 year 10 months)

Built a recovery flow for failed external checks, reducing stuck applications to zero during post-release monitoring. Developed backend workflows for corporate customer onboarding and improved investigation of failed operations.

Spring Boot PostgreSQL Kafka Redis Docker Jenkins Prometheus Grafana

Java Backend Developer

EPAM

Aug 2023 - Oct 2024 (1 year 2 months)

Developed backend logic for order processing covering payment, fulfillment, shipment, and cancellation flows. Added idempotent Kafka event handling and automated tests to protect critical order-processing scenarios.

Spring Boot Hibernate PostgreSQL Kafka Docker Junit Mockito

Java Backend Developer

SKB Kontur

Mar 2021 - Aug 2023 (2 years 5 months)

Fixed status recalculation after company data changes and implemented validation workflows for B2B applications. Stored validation results and reasons for manual review to improve investigation of failed checks.

Spring Boot Hibernate PostgreSQL REST APIs Docker Gitlab CI Junit Mockito