Seeking remote Java/Kotlin JVM backend work from Odesa, Ukraine; available immediately. Open to full-time, part-time and freelance roles, with integrations, databases, messaging and code review. Full-time target: USD 900/month net (USD 10,800/year after taxes), negotiable by role and conditions. The annual profile figure is net; gross depends on the contract and taxes.
Looking for a job
Vladyslav Ponomarenko
@vladyslavponomarenko
Java/JVM Backend Developer: 6 months commercial Kotlin/Ktor, 2 months paid Java/Spring freelance; around 3 years of hands-on practice.
UkraineWhat I'm looking for
I have 6 months of commercial backend experience at Swapter (Kotlin/Ktor) and 2 months of paid Java/Spring Boot freelance work. Overall, I have around three years of hands-on Java/JVM development, including applied personal projects.
At Swapter, I worked on REST integrations, transaction-processing reliability, Redis-backed operational state, Kafka messaging, and SQL/Ktorm analytics. I connected an HTTP/SDK report trigger with Kafka event processing and Telegram delivery.
For a freelance client, I delivered Java 21/Spring Boot email-processing automation with OAuth2 integration, persistent processing state, deduplication, and retry tracking.
My selected projects include KPOK2, a Java/Spring Boot study-support tool with Selenium, asynchronous collection, bounded retries, and PostgreSQL deduplication; and Ariadne's Trade / DeribitJavaConnector, related Java/Spring components with reactive WebClient flows and Redis TTL caching. Code and project descriptions are available on my GitHub profile.
I am looking for a Java Backend Developer role and also consider Kotlin/JVM backend opportunities. Based in Odesa, Ukraine, I prefer remote work and am open to full-time, part-time, and freelance opportunities.
Experience
Work history, roles, and key accomplishments
SW
Backend Developer
Swapter
Sep 2025 - Mar 2026 (6 months)
September 2025–February 2026, both months inclusive: 6 months of commercial Kotlin/Ktor backend work. Improved TRON reconciliation with block-driven processing, Redis pending state and SQL recovery. Built authenticated CoinEx integrations; connected HTTP/SDK analytics with Kafka and Telegram delivery. Worked on SQL/Ktorm analytics.
June–July 2025, both months inclusive: 2 months on a paid client contract via Upwork, not employment at Upwork. Delivered Java 21/Spring Boot email-processing automation with Gmail OAuth2 integration, configurable filtering, persistent processing state, message/attachment deduplication and retry tracking. Client feedback: 4.5/5.
Education
Degrees, certifications, and relevant coursework
Odesa National Medical University
Master's degree, Medicine
2016 - 2025
Availability
Looking for a job
Location
UkraineAuthorized to work in
Portfolio
github.com/Nanachi357Salary expectations
11k+ USD
Job categories
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