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Sergey Chernolyas

@sergeychernolyas

Java developer at Digital Future Group integrating GDPR workflows across 15 microservices for a financial services platform.

Serbia

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At Digital Future Group, I'm integrating a GDPR client module across 15 microservices on a financial services platform, supporting data access and deletion workflows. I also maintain JUnit tests and work with ActiveMQ for asynchronous processing.

At EXANTE, I migrated a data caching library from Scala to Java and moved data storage to distributed key-value systems. The work enabled parallel updates, configurable memory use, and near-instant application startup.

At DataArt, I developed a Kafka topic comparison system that processed 1 million comparisons per minute across topics containing 60 million messages each. I also contributed to modernizing a medical clinic system and led a travel service project that improved performance by 3x.

My open-source contributions include an OrientDB integration module for Hibernate OGM and enhancements to its MongoDB support. I've also contributed to Infinispan and Apache Ignite.

Experience

Work history, roles, and key accomplishments

Current

Java Developer

Current

Digital Future Group

Nov 2025 - Present (11 months)

Contributing to GDPR compliance initiatives on a financial services platform within a cross-functional Agile team. Integrated a GDPR client module across 15 microservices to support right-to-access and right-to-erasure requirements under EU data protection law.

Java 21+Spring Boot ActiveMQ Junit SQL Maven Docker Kubernetes

Lead Java Developer

MoldStud

Oct 2025 - Feb 2026 (4 months)

Led greenfield development of an enterprise-grade search microservice for a social platform client, under a B2B contract. Managed a team of 2 developers and designed an event-driven search microservice with eventual consistency and out-of-order event handling.

Java 25 Spring Boot 3.5 Elasticsearch NATS Spring Cloud Stream Spring Cloud Vault Spring Cloud Config Keycloak Shedlock MapStruct Docker Kubernetes Micrometers Prometheus

Lead Java Developer

EXANTE

Mar 2025 - Aug 2025 (5 months)

Led development initiatives and technical architecture decisions for enterprise-grade financial trading systems. Responsibilities included team formation through interviewing candidates, developing Java components, defining component and corporate architecture, mentoring development team, and hands-on coding.

Java Scala SQL Docker Infinispan Apache Ignite Spring Boot PostgreSQL Kafka

Lead Java Developer / Senior Java Software Engineer

DataArt

Oct 2021 - Feb 2025 (3 years 4 months)

Delivered multiple high-impact projects across healthcare, music streaming, banking, and travel industries, demonstrating expertise in legacy system modernization, high-performance data processing, and microservices orchestration.

Java Spring Boot Keycloak Hibernate PostgreSQL SAP SQL Anywhere Kafka Kafka Streams AWS OpenShift JAXB Jackson XSLT Redis Groovy Flowable BPM BPMN

Tech Lead

RoboFinance

Feb 2021 - Aug 2021 (6 months)

Led technical initiatives for fintech company, managing architecture decisions and development. Developed microservice for user profile management and designed proof-of-concept for microservices orchestration using BPMN and Zeebe.

Spring Boot Hibernate ORM Kotlin PostgreSQL BPMN Zeebe Camunda

Lead Developer

Home Credit Bank

Nov 2020 - Jan 2021 (2 months)

Developed proxying service for financial services integration.

Spring Boot Kafka Apache Ignite

Lead Developer / Team Lead

EPAM Systems

Jan 2017 - Oct 2020 (3 years 9 months)

Progressed through multiple roles across strategic projects for major Russian enterprises including banks, mobile operators, and government agencies. Led development of payment processing system, recommendation system, and remote banking system.

Apache Ignite Infinispan Cassandra Apache Spark HBase Phoenix Airflow Python Hibernate OGM Spring Boot

Senior Java Developer

Freelance - Hibernate OGM Contribution

Jan 2016 - Jan 2019 (3 years)

Contributed to Hibernate OGM open source project with multiple significant contributions recognized by core team. Developed integration module for graph-oriented database OrientDB and enhanced MongoDB module.

JDK 7 8 Hibernate OGM Git Github OrientDB MongoDB

Architect / Senior Java Software Engineer

Neoflex

Apr 2012 - Jan 2017 (4 years 9 months)

Delivered multiple strategic projects for major Russian banks and state enterprises, progressing from Senior Engineer to Architect. Built comprehensive testing infrastructure for national payment card system and developed architecture for new digital bank.