Support with some development of LIVE iOS APP

Hi All, I am repairing some small issues and want to add some functionality to an app that is currently live on the appstore (https://apps.apple.com/us/app/avenues/id1448098428). I have all my tasks listed on Trello. Please take a look at the app. Tasks include: Add a button with a sub-menu, adjust distance calculations, repair some filter issues, and more. I have a BACKEND developer. I need a FRONTEND developer to help on ongoing basis ideally.