Need freelancer for flutter app customization

I am looking for a freelancer to customize the existing flutter app called hayto. I have a detailed list of design and functionality changes that I would like to have implemented in the app, which need to be completed within a week. The freelancer must have a solid understanding of flutter development and a good grasp of design principles. Furthermore, they should be able to work quickly and provide quality results. I expect the customization to be carried out in the specified timeline, so the freelancer must be organized and capable of performing the task under pressure. If you feel that you can do this project, please send me your proposal and we can discuss further details.