- Employed Spring Security for secure user authentication and authorization.-Additionally, I dedicated my efforts to creating a RestAPI specifically tailored for mobile developers. By optimizing endpoints and data formats for mobile consumption, I aimed to provide a smooth and responsive experience for users on various mobile devices.- deployed them on a Linux server using Amazon EC2 instances, leveraging the power of MobaXtream for remote access and efficient server management. Furthermore, I established a robust CI/CD pipeline using BitBucket.-In the frontend development aspect, I utilized JavaScript to make asynchronous calls to our REST API using Ajax. This dynamic approach allowed us to fetch and update data in real-time, improving the user experience by eliminating the need for page reloads and providing a more responsive interface.Liquibase: For database schema management and version control, I implemented Liquibase. Liquibase allowed for seamless tracking and management of database changes across different environments. By defining database changesets using XML, YAML, or SQL formats, Liquibase ensured that database schema changes were versioned, documented, and applied consistently across development, testing, and production environments. This approach facilitated smooth database migrations and ensured database schema consistency throughout the application lifecycle.