Middle Java-arendaja

I am responsible for developing and supporting a full-cycle automated debt collection system using Kotlin, Ktor, Koin, Exposed, PostgreSQL, and Apache Pulsar. My work includes designing new functionality, implementing business logic, evolving existing services and modules, optimizing system performance and resource-intensive SQL queries, and integrating with external government and banking systems. I also participate in architectural decision-making to ensure that technical solutions align with business requirements. I have significantly refactored legacy code to improve maintainability and quality, migrated the data access layer to a reactive approach, and designed and implemented document tracking for an electronic document management system. I also contributed to improving the internal task tracker, participated in code reviews and technical discussions, and wrote unit tests using JUnit.

As part of an airline ticket search and passenger transfer project, I worked on Java and Spring Boot services responsible for business logic and real-time integration with external systems. I helped design architectural solutions, optimized PostgreSQL, MongoDB, and Cassandra databases, and handled deployment, logging, and monitoring with Docker and GitLab CI/CD. Among my key contributions were improving API performance through query optimization and caching, implementing scalable Kafka-based communication between internal services, and developing a monitoring and logging strategy that reduced incident detection time. I also enhanced internal airline systems, wrote unit tests, and maintained technical documentation to support knowledge sharing and faster onboarding.