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Mikhail Kalinin

@mikhailkalinin1

Java Software Engineer who developed distributed document processing microservices at Format Koda, handling 300M+ daily records.

Serbia

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At Format Koda, I designed and developed Java/Spring Boot microservices for a distributed document processing platform handling 300M+ daily records. I also developed asynchronous processing workflows and contributed to the platform's event-driven architecture.

I optimized HBase data models and Hadoop MapReduce jobs, reducing HBase storage usage by 30%, and improved ClickHouse query execution time from 1 hour to 15–20 minutes. Previously, at First Line Software, I improved PostgreSQL query performance and reduced average API response time by 40%.

Experience

Work history, roles, and key accomplishments

Senior Java Software Engineer

Format Koda

May 2022 - Aug 2026 (4 years 3 months)

Designed and developed Java/Spring Boot microservices for a distributed document processing platform handling 300M+ daily records. Implemented fault-tolerant integrations, optimized HBase and ClickHouse, and deployed services on Kubernetes.

Java Spring Boot Kafka HBase Clickhouse PostgreSQL Kubernetes Resilience4j Hadoop MapReduce Distributed Systems Event Driven Architecture

Java Software Engineer

First Line Software

Jul 2021 - May 2022 (10 months)

Developed and maintained Java/Spring Boot backend services with Hibernate, improving PostgreSQL query performance and reducing API response time by 40%. Delivered logistics reporting features and implemented Angular/TypeScript UI features.

Java Spring Boot Hibernate PostgreSQL SQL Angular TypeScript CI CD

Java Software Engineer

Programma-T

Mar 2020 - Jul 2021 (1 year 4 months)

Developed backend components for document management and business process systems. Designed and implemented REST APIs, refactored legacy code, and built JasperReports-based reports with complex SQL.

Java REST APIs SQL Jasper Reports Legacy Code Refactoring