WordPress Bookly Plugin customization

We want to make three changes to bookly plugin : The developer for this project needs to have experience with customization of WordPress plugins. Preferably with the Bookly plugin. The end goal of this project is to customize the plugin to have the capability to deal with clients on a recurring subscription level. 1 - Add capacity per staff member : Actually in booking, there is no capacity settings for staff members, we want you to add this option that will be set in this logic : For the same time slot, the staff member can be booked as many times as long as it doesn't exceed it's capacity per time slot. (Ex : Staff member had capacity of 16, he can be booked for service1 by client1 for 4 people, than for service2 by client2 for 3 people and finally by client3 for 9 people, = 16 peoples = he cant take anymore bookings for that time slot) 2 - Add breaks in services : Add breaks for services that are at least one hour long. For exemple : If the service is two hours long, we can set a break of 30 min after the first 1 hour of the service. During that break, the staff member should be free to be booked by another person. 3 - Add minimum capacity required by service : Bookly has already maximum capacity required per service. we want to add the same feature but for minimum capacity for a service. Exp : A service is 10$/hour. This service minimum capacity is 20 people. When booking the client should be able to chose number of people starting 20 people. The minimum price to pay is : 10$ x 20 people = 200 than extra 10$ for each person exceeding the 10 minimum quota. We elaborated a file with screenshot of what we want and example to make it easy for you to understand. Project will go through 3 milestones : For each feature we are successfly able to test, we will unlock a milestone. First milestone : Add capacity per staff member Second Milestone : Add breaks in services Third Milestone : Add minimum capacity required by service Thank you.