Created a site on Bitrix 24

We are looking for a site developer on Bitrix 24 for a cycle studio. Our project is a new format of cardio training on bikes indoors.
We need a specialist who can accompany the project until completion (and possibly accompany it after launch), closing the following questions:
1. Creating a site on Bitrix 24: the ability not only to work with the designer, but also to refine the functions with the help of code
2. Customization of the admin panel
3. Setting up synchronization with the accounting system, knowledge of 1C Bitrix
4. Set up synchronization with the app
5. Ability to work with the API to integrate the site with the application.

We are ready to accept a like-minded person in the team who will be able to immerse themselves in the specifics of the project and together with us to think over and configure the architecture of the system. I will send a presentation of the project upon request.