Ready-to-Customize Taxi App Development

Customized Taxi App Solution (Rider, Driver, Admin) - Based on Pre-built Script
​Description:
I am looking for a developer who already has a high-quality, ready-made Taxi App solution (Flutter preferred) and can customize it for my business.
​The requirements are simple:
​I need a full system: Rider App (iOS/Android), Driver App (iOS/Android), and a web-based Admin Panel.
​Quality Benchmark: Please look at the "Rizo Go" app on the Play Store/App Store. I want my app to have a similar smooth performance, clean UI, and map functionality (it doesn't have to be identical, but should feel as professional as Rizo Go).
​Customization: You must be able to rebrand the app (logo, colors, name) and set it up on my server.
​Who I am looking for:
​A developer/team with a proven, bug-free taxi script.
​Someone who can offer a competitive fixed price since I am using a pre-built solution as a base.
​Someone who can provide a live demo or video of their existing solution before we start.
​Please share:
​Link or Video of your ready-made taxi app.
​Your best fixed-price offer for the full setup and customization.
​How long it will take to launch the MVP version.