- Designed and developed Spring based REST API services for different debt collection processes.- Improved services with complicated business logic via IBM ODM.- Migrated legacy codebase to ODM-like framework (Kotlin DSL).- Optimised development and deployment workflows in our team via Gitlab CI/CD, Docker, Jira, an internal regression testing tool.- Improved our services maintainability by sending logs to analogue of ELK and integrated with internal real time analysis tool (Grafana, Splunk-like internal tool).- Searching suitable data using SQL and ClickHouse for support and regression tests.- Created specific API for QA to speed up testing of business logic.- While mentoring rookies created clear onboarding flow for our team.- Tightly communicated with customers for requirements extraction and business analysts for smooth integrations.