Java web application (online store) performance optimization

Looking for a seasoned Java developer to help us improve the performance of our web application , ecommerce store. The project will be consider successful if the following requirements are met. - 95% of the Login requests should respond in less than 2 seconds measured on the application server. Currently it takes 7 seconds to sign in to the application. - 95% of the moving from one page to another should respond in less than 3 seconds on the application server. Currently it takes 5-7 seconds to switch from page A to B. - 95% of the next page requests (i.e. using the pagination ) should respond in less than 3 seconds on the application server. Currently it takes 5 seconds to switch between pages using the pagination. - All new introduced bugs must be fixed. Technology stack: Application is hosted in AWS Web server: Tomcat 8 Frontend: HTML, CSS, JavaScript Backend: Java, Spring, Hibernate, Ehcache, JDBC Search engine: ElasticSearch Database: IBM DB2 for i ( JDBC connection) Build Tool: Maven Version Control: Git