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Denis Tumel

@denistumel

Senior Java Engineer at EPAM building HR-tech microservices for salary calculation and performance analytics.

At EPAM Systems, I work on an HR-tech platform for employee search and hiring, contributing to performance analytics and salary calculation features.

I design and implement Java and Spring Boot microservices and domain modules, including REST APIs, persistence layers, and integration contracts. My work on calculation and analytics includes orchestration, data aggregation, and batch/ETL processing.

At Syberry, I delivered backend and full-stack features for production systems and integrated services including SendGrid, Okta, and Google APIs. I also implemented Spring Batch ETL processes and improved data processing reliability.

Earlier, at Syberry and VironIT, I built and maintained Java backend services for data processing, healthcare, and automation systems. I’ve also prepared technical design documents, supported production systems, and contributed to code reviews, mentoring, and interviews.

Experience

Work history, roles, and key accomplishments

Current

Senior Java Engineer

Current

EPAM Systems

May 2024 - Present (2 years 4 months)

Design and implement Java/Spring Boot microservices for an enterprise HR-tech platform, focusing on performance analytics and salary calculation. Apply microservice patterns, Kafka integrations, and AWS services while ensuring production reliability and observability.

Java Spring Boot Spring Security SpringBatch Kafka PostgreSQL AWS Kibana Datadog Microservices Outbox Pattern Event Driven Architecture REST APIs SQL Optimization ChatGpt Claude

Java Software Engineer

Syberry

Sep 2023 - Mar 2024 (6 months)

Delivered backend and full-stack features using Java, Spring Boot, and React, integrating third-party services like SendGrid, Okta, and AWS. Implemented ETL processes with Spring Batch and improved code quality through refactoring and testing.

Java Spring Boot Spring Security Spring Data SpringBatch Hibernate REST APIs React Sendgrid Okta AWS Google API ETL Junit Mockito SQL

Java Developer

VironIT

Dec 2019 - May 2020 (5 months)

Developed Java software components using Core Java, JDBC, and SQL, and integrated third-party APIs for PDF parsing and document processing. Debugged and resolved application issues while supporting production functionality.

Java Core Java Object Oriented Programming JDBC SQL Git API Integration Debugging