Salesforce- Calendly Implemntation

Hello, my firm is using Salesforce Sales Cloud. We are looking for an expert who can help us develop a rather complex integration with Calendly. The person interested must have done complex integrations with Salesforce and Calendly before, must know how to use and set up flows, and should work on the fixed price. We would like to have the following done: - Have "Schedule an Appointment" button on our website, calendars of all salespeople will be merged. - If this is a NEW lead, the system should assign the lead to the salesperson whose appointment was booked. - If the lead was already in the system, the lead should be assigned to that salesperson first. If his/her salesperson is not available at that time, there should be a solution to that problem. We will have a pre-contract meeting to discuss this and to be on the same page before starting the project.