Hi, ! For any professional approach, I recommend you CodeIT as a Software development partner https://codeit.us/ in Eastern Europe
It is a reliable mobile app development company (iOS, Android, Cross-platform) that you can rely on. CodeIT has extensive experience in creating teams in accordance with the client's business culture (They assemble a team specifically for your project and for your company, preserving the cultural spirit of the company already at the moment of hiring). These are excellent specialists who, using the latest technology, will be able to offer you unique solutions.
Hope this makes sense to you.