Sergii Gorin

Senior Java Software Engineer @Tietoevry

Kyiv, UA

Designed and implemented several Java/Spring Boot applications to integrate with telecom provider’s infrastructure and extracted some standalone functionality from monolith application to microservices.Supported 2 large monolith enterprise web-applications, developed new features, optimized existing logic, fixed bugs and migrated to the latest versions of JDK, Spring, Springboot, Hibernate, etc.Developed RESTful APIs that fully automate service ordering, activation, monitoring, and termination, reducing manual intervention and staff involvement in complex internal processes.Developed a user friendly portal using React and TypeScript.Applied Spring Security and JWT authentication for customer data protection.Integrated with Oracle and Redis for high-availability data management.Coordinated with cross-functional teams (QA, AQA, product owner, scrum master) to ensure sprint goals.Conducted code reviews, mentoring interns/juniors, and maintained onboarding documentation