Enhance UI/UX for Live Web App

I am a developer with a live web application and am seeking an experienced front-end specialist to help enhance its design and user experience.

Here is the site currently hosted, so you can have a look:
https://dev-skill-labs.vercel.app/

This project has two primary goals:
1. Redesign the landing page: Create a modern, professional, and high-converting design for the main landing page.
2. Ensure mobile responsiveness: Adapt the entire web app to be fully functional and aesthetically pleasing on all devices, from desktop to mobile.

I have a clear vision for the final result, but am open to a developer who can offer creative suggestions to improve the overall look and feel.

Skills required:
-Front-End Development
-UI/UX Design
-HTML5, CSS3, JavaScript
-Responsive Design

Timeline:
Ideally, I would like this project completed within one week of starting the work. Please provide your estimated timeline and approach in your proposal.

To apply, please include:
-A portfolio of recent front-end work, specifically highlighting projects involving landing page design and mobile optimization.
-Your proposed project fee.