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Oleh Kulbaba
Open to opportunitiesSoftware Engineer
I build reliable payment microservices with Java, Spring Boot, Kafka, and AWS.
UkraineSoftware Engineer at PrivatBank
About
At PrivatBank, I build payment-processing microservices with Java 21, Spring Boot, Apache Kafka, PostgreSQL, MongoDB, and Redis. I improved authentication token handling with distributed locks, implemented reliable outbox-style Kafka publishing, migrated about 10 services to Spring Boot 4, and built an SLA monitoring service end to end.
Previously at Chewy, I developed payment transaction hydration and asynchronous retry flows using AWS SQS, automated EKS deployments with Helm, restored distributed request traceability, and created integration tests and technical documentation for a scalable payment platform.
Experience
Software Engineer
Developed payment features across Java 21 / Spring Boot microservices, implemented authentication with distributed locking, made Kafka event publishing reliable using an outbox pattern, migrated ~10 microservices from Spring Boot 3 to 4, and designed an SLA monitoring service end to end.
Java 21+Spring BootMavenDockerKubernetesPostgreSQLMongoDBRedisKafkaApache CommonsLombok