•Ensured use of Agile and Scrum methodologies, resulting in 20% increase in project completion.•Implemented REST APIs for data exchange between services, improving data retrieval speed by 30%, enhancing the functionality and connectivity of applications.•Revolutionized system application by incorporating JDK8 features, which increased processing speed by 20%.•Implemented producers and consumers using Apache Kafka, facilitating high-throughput and low- latency flow between microservices which resulted in reducing data processing time by 40%.•Optimized database performance by integrating Spring Data JPA reducing average query time from 2 seconds to 100ms resulting in 30%reduction in response time, resulted in improving application performance.•Performed unit testing using Junit resulting in a 14% reduction in bugs and improved code quality.•Implemented a CI/CD pipeline using Jenkins and Docker, reducing deployment time by 40% and increasing release frequency by 100%..