Maintained previously developed web applications which is a platform that includes:user management, resource assignment, labeling system, schedule system, fully customizable electronic form-building and filling system, and online training system.Designed and created a new version of the above platform:● Front-end development including customizable user interface, browser local storage, performance optimization with in-house built components, e2e testing, etc.● Back-end development including structural design using MVC and ORM, authentication, RESTful API, SQL query optimization, PDF generating, etc.● Integrated different functionality into one application in order to provide better user experience and performance.● Created a notification system using scheduled tasks to provide the ability for clients to get customized reports with individual set intervals. Code review with team members to ensure high-quality code delivery and convention. Minor troubleshooting and bug fixes for our mobile applications. (iOS)