I am looking for a person to create a mobile application

The application is a secret for now, but it will resemble Booksy in its form. I am looking for a person who has some experience, but above all is communicative, understands what is involved, does not ask for a very large sum, and at the same time understands the essence of the problem and the business. Importantly, I am in the preliminary stage. I need a programmer, I will be looking for a lawyer, I do marketing and SEO myself, I have knowledge of programming languages to a small degree (but enough that I understand many things). I think we will get along.

Meetings can be as online as possible. I am from Krakow and we can also meet here if needed.

If the app succeeds, it will be a super business. If it does not succeed - well, my loss :)

Please give me concrete proposals, with amounts and deadlines for completion (for example, in weeks, months), and something like a portfolio (or a link, etc).