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GeraltofRivia User

@geraltofriviauser

Message

I build high-load Java microservices that improve payment performance, scalability, and production reliability.

Kazakhstan

Message

At Kcell, I decomposed a multi-module monolith into Java 21 microservices, doubling service throughput and reducing average response time by about 40%. I also introduced Redis caching, automated CI/CD releases, and operated AWS services with ELK, Prometheus, and Grafana monitoring.

I've built banking and government backends at Halyk Bank and Dara Solutions using Spring Boot, Kafka, PostgreSQL, Oracle, Docker, and Kubernetes. My work includes payment-flow optimization, secure card issuance and account-opening integrations, critical incident resolution, automated testing, and mentoring junior developers on clean code and SOLID principles.

Experience

Work history, roles, and key accomplishments

Current

Java Developer (Middle+)

Current

Kcell

Feb 2025 - Present (1 year 7 months)

Led decomposition of a multi-module monolith into microservices, improving scalability and increasing service throughput by approximately 2x. Migrated the codebase from Java 11 to Java 21 with zero downtime and optimized backend performance, reducing average response time by approximately 40%.

Java 21+Spring Boot Microservices PostgreSQL RabbitMQ Redis Flyway Docker Kubernetes AWS EC2 S3 Cloudwatch IAM CI CD ELK Prometheus Grafana

Java Developer

Halyk Bank

Apr 2024 - Feb 2025 (10 months)

Developed and maintained banking backend applications and REST APIs, integrating Keycloak for authentication and Colvir core banking system. Optimized payment processing flow, increasing performance by approximately 2x and reducing operation time by approximately 35%.

Java Spring Boot Microservices REST APIs Oracle Hibernate JPA Kafka Keycloak Colvir Angular SQL Event Driven Architecture

Java Developer

Dara Solutions

Aug 2021 - Apr 2024 (2 years 8 months)

Developed and maintained Java applications based on microservice architecture for government and enterprise clients. Designed REST APIs, containerized services with Docker, and managed database schema evolution with Liquibase.

Java Spring Boot REST APIs Microservices PostgreSQL Hibernate JPA Docker Liquibase Unit Testing Integration Testing Code Review Mentorship

QA Intern

Home Credit Bank

Jul 2022 - Oct 2022 (3 months)

Performed manual and functional testing of backend services. Designed and ran API load tests with high-load scenarios, analyzing performance and stability with the backend team.

Manual Testing Functional Testing API Testing Load Testing Performance Analysis