In this study, the author intends to improve online learning media (E-Learning) which is widely used by all educational institutions in Indonesia and even throughout the world. Progressive Web Application (PWA) itself is the ability of an application to have features such as web-based applications in general, but with mobile experience optimization in its use. One of these features utilizes the cache from the browser that was previously accessed so that it can save on data consumption during the implementation of learning and maximize the online test process. It is hoped that this research can maximize online learning and anticipate obstacles when students carry out online learning. For the test, the author compares the web application using PWA which will be built with the learning media used by Jakarta Global University which is based on Moodle. From the results of the tests that we carried out, it was found that the results of this optimization there were improvements in terms of Performance, Accessibility, Best Practice, SEO and PWA. Collected data from Lighthouse has shown that J-Lens has significant result compared to JGU Learning. Average J-Lens has a score of 26,8% more than JGU Learning for each score of JGU Learning 57,6 % and j-Lens 84,4% for this measurement. Implementing PWA on j-lens applications, this allows users to install this application with smaller memory compared to mobile-based applications.

The outbreak of the covid-19 virus has caused many listing and funding companies to go bankrupt. J-trus group is one of the companies that has experienced the impact of covid 19, so that the company is able to survive, the company is looking for other ways to get additional income, namely by expanding the sale of basic necessities online, here the author provides a solution using a web-based application to realize this the. So the purpose of this paper is to design and build a PHP-based application with the Codeignither framework. The method uses the waterfall and the database uses a MYSQL database. The design includes Use Case Diagrams, Activity Diagrams, class diagrams. Testing the application with the Black Box testing method, functionally has been declared successful. And based on the test results using the System Usability Scale (SUS), a score of 71 has been obtained with a value above the average so that it can be accepted by users

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