Java/Kotlin Backend Developer

About Me

Results-oriented Backend Developer with 7+ years of experience in designing and building microservices ecosystems using Java and Kotlin. Proven track record in database migrations, tech stack upgrades, and architectural improvements in banking systems. Advocate for Agile methodologies, clean code practices, and team knowledge sharing.

Technical Skills

Java (11+), Kotlin
Spring Boot/Cloud
Microservices architecture
PostgreSQL, MongoDB, Redis
Kafka, REST, WebSockets
CI/CD (Jenkins)
Containerization (Docker, Kubernetes)

Testing (JUnit, Testcontainers)
OAuth2, JWT, Keycloak
SQL/NoSQL migrations
Data analytics (InfluxDB)
Monitoring (Spring Boot Admin)
Agile, Scrum
Git, Bash, Python

Experience

Mobile Virtual Network Operator (International bank)

Aug 2024 — Present

Developing a virtual mobile network operator for a top-tier bank

Optimized 50-microservice ecosystem for SIM card issuance workflows
Migrated 5 production services from Oracle to PostgreSQL
Upgraded stack to Java 17 and Spring 3.2
Migrated caching from Hazelcast to Redis

Pool Remote Control System (Startup)

Nov 2022 — Aug 2024

Implemented Keycloak-based authentication
Designed Spring Cloud microservices architecture
Processed IoT sensor data in InfluxDB
Developed WebSocket interfaces

Diamond Sales System (Diamond sales company)

May 2021 — Nov 2022

Automated UI/API testing (Selenoid, Allure)
Configured Jenkins CI/CD pipelines
Integrated TestRail with Jenkins