kids education app development and troubleshooting

we have a kids educational app developed in godot 'multiplication star' it is on apple appstore and can be downloaded. we need a godot developer to do some troubleshooting and also going forward to help make changes from time to time. we also need the developer to maintain the app (fix bugs), keep the app uptodate with IOS releases etc. we need the developer on a contract basis. this is not a full time role but payment will be based on as and when work is required. possible to have a monthly payment for maintenance and support