hello,
I am a professional Moodle mobile app developer for both moodle mobile app 3.5 and earlier versions also.
I am developing and customizing Moodle mobile app and even collaborating with Moodle HQ for functional enhancement. I am one of the Moodlemoot organizer as well.
I have gone through all your details and would like to have a discussion with you regarding all your expectations. I can start right away and can also show you some of the apps I have developed for my clients.
I can assure you for the quality output and a long term association.
Note :- I have done custom branding, plugin integration, Gamification and integration of Moodle mobile app with many client.