Premium Website with Calculator and Payments

Job Description: I am launching a premium cleaning service company in Trójmiasto (Poland). I am looking for a tech-savvy freelancer to build a high-converting, "Zero-Phone" booking website that automates the entire customer journey. I don't just need a website; I need an automated business engine. The goal is to automate the following flow: 1. Service Calculator: An interactive tool where customers select their property type (e.g., Apartment/House), size, and frequency. It should dynamically calculate the price. 2. Upselling: A section to add extras (e.g., window cleaning, oven deep clean) that updates the final price automatically. 3. Instant Booking & Payments: Integration with a booking calendar (e.g., Calendly/SimplyBook.me) where customers can select a slot and pay upfront via Stripe/Przelewy24/Blik. 4. Automated CRM/Notification: Upon payment, the system should generate an invoice (e.g., integration with Fakturownia/wFirma), send a confirmation email, and push the booking to our team's Google Calendar. What I need from you: Expert knowledge in WordPress (Elementor Pro) or Webflow. Experience in setting up interactive calculators and booking workflows. Ability to integrate payment gateways (Stripe/Przelewy24). Strong focus on UX/UI (Premium, minimalist, high-end aesthetics). Reliability and ability to deliver a fully functional, mobile-responsive system. Please include in your proposal: Examples of websites you have built with booking/calculator features. Briefly explain which stack you would recommend for this project (WordPress vs. Webflow). Your estimated timeline for a MVP (Minimum Viable Product). I value efficiency and clear communication. If you have built automated booking platforms for service businesses before, I want to hear from you.