Open to opportunities

Nikita Liubov

@nikitaliubov

Java Backend Developer with 3 years’ experience building high-load microservices in fintech using Java, Spring Boot, PostgreSQL, and messaging.

Hungary

Message

What I'm looking for

I’m looking for a team where I can deepen my backend and distributed-systems expertise, own features end-to-end, contribute to architecture discussions, and grow into a confident Middle Java Developer.

I’m a Java Backend Developer with 3 years of commercial experience, focused on high-load microservices and distributed systems. At Tata Consultancy Services, I developed and maintained backend services with Java 21 and Kotlin (Spring Boot), supporting end-to-end ownership from design and implementation to testing, CI/CD, and production support.

I’ve also contributed to major technical evolution—driving a Java 8→21 migration with backward compatibility and maintaining 75%+ test coverage using JUnit and Mockito. Previously at LeadFin, I architected high-throughput fintech backends (up to 5,000 RPS), improved PostgreSQL performance, implemented Redis caching (reducing database load by ~30%), and built event-driven workflows with RabbitMQ.

Experience

Work history, roles, and key accomplishments

Java Developer

Tata Consultancy Services

Jan 2024 - Jan 2026 (2 years)

Developed and maintained backend microservices using Java 21 and Kotlin with Spring Boot in a large-scale enterprise platform, improving scalability and reliability. Contributed to a Java 8 to Java 21 migration, implemented business features, and resolved production bugs while maintaining unit and integration test coverage using JUnit and Mockito.

Java 21+Kotlin Spring Boot Microservices Distributed Systems Java Migration Backward Compatibility REST APIs Unit Testing Integration Testing Junit Mockito CI CD Jenkins Spinnaker Confluence Apiary Agile Scrum API Documentation

Java Backend Developer

LeadFin

Sep 2021 - Aug 2022 (11 months)

Architected and developed high-throughput Java/Spring Boot backend microservices for financial transaction processing, sustaining up to 5,000 RPS under production load. Designed PostgreSQL performance improvements, built RESTful payment integrations with webhook handlers and idempotent processing, implemented Redis caching and RabbitMQ-driven asynchronous workflows, and delivered Dockerized deploy