UK Chauffeur Booking SaaS Platform

I’m looking for an experienced full-stack developer or small team to complete a SaaS-based booking platform for a UK chauffeur and car booking service. The project is already in development, and I need someone to review the existing codebase, complete remaining features, fix issues, and prepare the platform for production. Key requirements include customer registration, online booking, pickup/drop-off management, date/time booking, vehicle selection, pricing, booking confirmation, customer and admin dashboards, driver management, payment integration, notifications, booking status updates, and responsive design. Please share your experience with booking systems, SaaS platforms, APIs, and payment integrations, and provide a clear assessment of what has been completed, what remains, what needs fixing, estimated development time, and total cost.