Next.js Api Bug Fix and User Experience Update for Existing Website

I am seeking an experienced developer to address a critical bug within the Next.js API of my existing website. Additionally, the project requires a comprehensive update to the site's User Experience (UX). The current project utilizes Next.js and Tailwind CSS, so proficiency in these technologies is essential. The ideal freelancer will be able to efficiently diagnose and resolve the API issue, as well as implement design improvements to enhance the overall user interaction and visual appeal of the website.