Full-Stack Developer / QA Engineer Needed to Fix Bugs and Make Web App Production Ready

I have an existing web application that is not fully production ready yet. The app is functional, but there are bugs, broken pages, UI/UX issues, and some areas that need to be reviewed, fixed, and improved before launch. I am looking for an experienced developer who can act like both a QA tester and programmer. I need someone who can go through the website carefully, identify issues, document them, and also fix the problems directly in the code. Responsibilities: * Review the entire web application from a user and technical perspective * Test all pages, buttons, forms, links, and workflows * Identify bugs, broken features, UI issues, and performance problems * Fix frontend and backend issues as needed * Improve page layout, responsiveness, and user experience * Ensure the website works properly on desktop and mobile * Check for errors, broken navigation, and incomplete functionality * Help make the application stable and ready for production * Provide clear updates on what was found and what was fixed