Real Estate Auction App -- 2

I need a complete mobile application—Android and iOS and webapp—that lets private sellers list property either at a fixed price or in an auction format, much like eBay but strictly for real estate. Core flow • New users sign up with phone number verification only or social logins . • A seller chooses a package (Bronze, Silver, Gold or Platinum) before every listing, then uploads photos, videos, documents and a written description. • Buyers browse listings through search filters for price range, location and property type, switch between fixed-price and auction tabs, and place bids or make direct offers. • In-app chat and one-tap call buttons connect buyers and sellers instantly. I want a clean, modern UI, real-time bid updates, push notifications and a lightweight admin panel to approve listings and manage the subscription packages. Deliverables • Native or high-quality cross-platform mobile app (Android & iOS) • Simple web-based admin console • Source code, documentation and a short hand-off call Please plan the build so the first testable version is ready within a month.