We are looking for a very good Android UX/UI designer

We are looking for a very good Android UX/UI designer We are developing a social app where users can upload videos and images to a timeline. Furthermore, the app has a dashboard and other pages to help employees to communicate with each other using an app. A freelance developer we hired has worked on getting the back end working and added an interface using a template. He is still working on the app. This app developer has done a bad job by initially delivering an app full of problems. Images are out of proportion; the design is messy, alignments are missing, a for the end user understandable UX is missing, uploading images and videos are not working, and many more of this kind. Unfortunately, we need to deliver a presentable app next week to a customer. Luckily we don’t need to deliver a fully completed app. We only need to present the basics of the app and showing a very professional UI and UX. The plan is that we want to hire a very good Android developer who can take over some of the UI and UX work and help the current app developer. The code to consume an API and other back-end codes, that will be done by the app developer who is currently working on the project. Your objective is to take care of fine tuning the UI, UX and checking and improving some of the codes of the current app developer. Furthermore, helping to get the app developed on time. The app is for a well known international company, so the expectations of this customer in terms of fine tuning is high. We are searching for someone who can start immediately. To be able to take your offer in consideration, we need to see some of your UI and UX work as it is essential that we select the right Android designer/developer because of the current time constraints. So please only react when you have much experience making professional UI/UX designs for Android apps.