Java Backend Developer with around 3 years of hands-on Java/JVM development, including 6 months of commercial Kotlin/Ktor backend experience and 2 months of paid Java/Spring Boot freelance work. I build backend services and integrations involving REST APIs, PostgreSQL, Redis, Kafka, and transaction-processing reliability. Based in Odesa, Ukraine; seeking remote backend roles.
Worked on Kotlin/Ktor backend services and external API integrations. Improved TRON transaction reconciliation with block-driven processing, Redis pending state, SQL recovery paths, and normalized address matching. Implemented HMAC-authenticated CoinEx account and trading integrations, and connected analytics events through Kafka to Telegram delivery.
Delivered a paid Java 21/Spring Boot email-processing automation for an Upwork client. Implemented Gmail OAuth2 authorization and token handling, provider connection checks, configurable filtering, persisted processing states, and message/attachment deduplication.
Master of Medicine, Medicine
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