Experience
I’ve been professionally engaged in backend development for 6+ years, building high-load services and fintech/banking platforms.
Senior Kotlin Backend Developer
Key duties- Led design and implementation of risk services including antifraud systems and application approval workflows.
- Defined risk factors and scoring models; implemented score-based decisioning to approve or reject applications.
- Built end-to-end pipelines: ingested statements, performed client scoring, produced risk decisions and automated approvals/rejections.
Tools
Kotlin
Spring BootSpring Security
PostgreSQL
Kafka
AWS
Docker
KeycloakZeebe
Grafana
Splunk
Senior Java DeveloperKey duties- Led creation of a high-load microservice processing 500,000+ credit applications monthly and enabling up to 5 B2B partner integrations.
- Launched a credit origination platform and reduced partner onboarding time by 1.5×.
- Integrated internal banking systems and external services (scoring engines, e-document providers), speeding up loan approval by ~30% and increasing approval rates by ~15%.
- Implemented security framework using Spring Security + OAuth 2.0 to improve compliance and data protection.
- Reduced primary database load by ~36% and improved response times using Redis caching.
Tools
JavaSpring BootSpring Data JPASpring Security
REST
SOAP
OraclePostgreSQL
Redis
RabbitMQDocker
KubernetesAWSKeycloak
LiquibaseGradleGrafanaSplunk
Senior Java DeveloperKey duties- Built microservices for credit and deposit products handling 10M+ daily requests.
- Implemented personalized offer calculation services and improved conversion rates by ~20%.
- Improved performance by ~1.25× via refactoring and load optimization, reducing latency in critical flows (up to ~40ms).
- Improved CI/CD efficiency by incorporating load testing; increased code coverage to ~93% and reduced rollbacks.
- Developed reporting system (Spring Boot + PostgreSQL) to provide stakeholders with up-to-date insights on product performance.
ToolsJavaKotlinSpring BootPostgreSQLKafka
OpenShiftLiquibaseJUnitSwaggerMyBatisMapStructMavenGradle
Azure
Java DeveloperKey duties- Created a real-time communication system using WebSocket supporting 5,000+ concurrent chat sessions for an educational platform.
- Streamlined the CI/CD process by integrating Jenkins with Docker and Rancher, reducing deployment times by 1.3x and increasing the frequency of successful releases.
- Built a personalized content recommendation engine using Kafka and GraphQL, increasing student engagement by 25% through tailored learning materials based on user behavior.
- Boosted test coverage from 39.8% to 80%, enhancing code reliability and maintainability.
ToolsJavaSpring BootPostgreSQLKafkaREST
GraphQL
WebSocketDocker
Jenkins
Rancher
FlywayAWS
ELK
Java DeveloperKey duties- Streamlined CI/CD by integrating Jenkins with Docker + Rancher, reducing deployment time by ~1.3× and increasing successful release frequency.
- Built transport logistics metrics system used by 200+ fleet managers, improving delivery tracking accuracy by ~30% across 1,500+ vehicles.
- Created route optimization dashboards reducing transportation costs by ~1.15× and cutting delivery times by ~1.2×.
- Automated KPI calculations to accelerate reporting cycles by ~1.5×.
- Collaborated with warehouse/inventory teams to improve end-to-end transparency and increase inventory turnover by ~15%.
- In a separate initiative, built a Kafka + GraphQL recommendation engine that increased student engagement by ~25%.
- Boosted test coverage from ~39.8% to ~80% to improve reliability and maintainability.
ToolsJavaSpring FrameworkSpring WebSpring Data JDBCPostgreSQLgRPCWebSocketJenkinsDockerRancherELK