Open to opportunities

Jaky Kujo

@nemytovsimon

Message

I am a Senior Java/Kotlin developer building high-load microservices and reactive systems.

Russian Federation

Message

What I'm looking for

Ищу работу Java/Kotlin backend-разработчика, где ценят качество, безопасность и производительность. Хочу развивать высоконагруженные микросервисы, CI/CD и мониторинг с Kafka/PostgreSQL. Готов к релокации, командировки не подходят.

I build and support high-load microservice platforms for mission-critical financial and security systems. I focus on reactive APIs and low-latency interactions using Spring WebFlux, Project Reactor, and Kafka, while delivering reliable persistence with PostgreSQL and Liquibase migrations.

I drive engineering quality through CI/CD (GitLab CI, Docker, Kubernetes), strong observability (Prometheus/Grafana, Elasticsearch/ELK), and proactive security (SonarQube, auditing). I’ve led major migrations, including moving microservices to Java 17/Spring Boot 3 and improving security outcomes—closing 15+ critical vulnerabilities and raising test coverage to 80%—and I’ve also mentored teammates through code review and onboarding.

Experience

Work history, roles, and key accomplishments

Current

Java/Kotlin Developer

Current

СПБ Биржа

Nov 2024 - Present (1 year 7 months)

Developed and supported a high-load microservices platform for exchange clearing, handling real-time settlement, guarantees, and risk management. Built reactive, low-latency APIs with Spring WebFlux/Project Reactor, optimized PostgreSQL/Liquibase, and implemented CI/CD, Kubernetes deployments, monitoring, and testing.

Kotlin Webflux Project Reactor Kafka PostgreSQL Liquibase Kubernetes

Java/Kotlin Developer

BI.ZONE

Apr 2023 - Oct 2024 (1 year 6 months)

Developed and supported high-load microservices for a transaction analytics platform, coordinating async workflows across 10+ services. Improved reliability in production with monitoring/diagnostics, wrote unit/integration/functional tests, and migrated services to newer Java/Spring capabilities with strong security outcomes.

Kotlin Spring Boot Kafka PostgreSQL Liquibase Kubernetes Elasticsearch SonarQube

Java/Kotlin Developer

Ростелеком-Солар

Dec 2021 - Apr 2023 (1 year 4 months)

Developed and maintained an event-driven, high-load platform for information security event monitoring and processing using Spring Boot and Camunda BPMN. Designed BPMN workflows, optimized PostgreSQL queries and migrations, and led the migration of 50+ business processes from Activiti to Camunda BPMN 7.

Kotlin Spring Boot Camunda Kafka PostgreSQL Liquibase Spring Security

Java Backend Developer

SKB LAB

Feb 2020 - Dec 2021 (1 year 10 months)

Developed and supported high-load financial products, including a B2B partner program and a microservice ecosystem for banking operations. Implemented and maintained 8+ microservices with event-driven messaging (Kafka/RabbitMQ), optimized PostgreSQL/SQL and Liquibase migrations, and improved CI/CD and monitoring workflows.

Spring Cloud Spring Security PostgreSQL Liquibase Kafka RabbitMQ Docker

Junior Java Developer

Goodt

Oct 2018 - Feb 2020 (1 year 4 months)

Developed and supported a monolithic Spring Boot B2B CRM system for HR management, including backend business logic and RESTful APIs. Optimized SQL performance (reducing main page response time by 20%), improved test coverage to 87%, and contributed to automated UI/API testing with Selenium, JUnit, and Allure.