Fix Backend Cache and Session Issues in Hexacloud Web Application

We are experiencing issues with our web application, which is built using JavaScript and PHP, when deployed in the production environment. The application works perfectly in the development environment, running tests on a local web server. However, when accessed remotely, users need to log in twice for the functionalities to work correctly. This issue does not occur the first time someone accesses the application, suggesting it might be related to browser cache management.

---Related Issues Believed to Have the Same Root Cause---

--Project Saving:
User projects are automatically saved every 5 seconds. However, during editing, refreshing the page sometimes alternates between the previously saved version and the currently edited version.
When the user has two different projects saved, refreshing the page alternates between the two projects.

--Login Screen:
After logging out, closing the browser, and reopening it, the user appears to still be logged in. However, refreshing the page reveals that the session is no longer valid.

--Loading Saved Projects:
Upon logging in for the first time after opening the browser, the saved projects in the database do not load. This issue resolves itself upon refreshing the page.
Additional Information:

URL for Testing and Issue Evaluation: https://www.hexacloud.com.br/

We are looking for an experienced freelancer to diagnose and resolve these issues, ensuring smooth functionality in the production environment without the need for users to refresh the page. If you have expertise in JavaScript, PHP, and browser cache management, we would like to hear from you.

Requirements:

Proven experience with JavaScript and PHP development.
Understanding of browser cache management and related issues.
Ability to troubleshoot and resolve issues in a production environment.
Strong communication skills and ability to document the changes made.
To Apply:
Please provide examples of similar issues you have resolved in the past and a brief outline of how you would approach diagnosing and fixing the issues described. Include your estimated time to complete the project and your rate.

We look forward to working with you!