Backend Developer for Marketplace Application

Hello, I am look for a backend developer for developing on an existing frontend source file, the Main cost drives of the project will be Booking system (state machine + validation) Real-time systems (chat + live updates + GPS) Payment system (local provider + commission split + money hold off Geo logic (service radius + matching) Availability & scheduling system logic Walker verification system (state machine + admin flow) Notifications system (event-driven) Reviews system (linked to bookings) Admin panel backend Auth system (OTP + JWT + roles) Profiles (user / walker / dog) Report system for user + walkers Preferred language will be node.js can also be javascript or typescript, I look for a freelancer who's responsive, transparent with me and has previous experience with Complex Marketplace Application. Full requirements below.