Senior Flutter Developer (Existing App, High Priority)

URGENT!
We have an travel App for Alanya in Turkey, called InfoALanya. Its a concept like ---------- and GetYourGuide (booking marketplace for vacationservices).
Would you be able to finish an app like this if we explain in detail exactly how it must work?
We have a clear vision of the final product and can demonstrate it through detailed graphic designs. Your role is to develop and complete the remaining functionality.

Description:
We have developed a mobile application that is approximately 65–70% completed, but we need a new developer who can take over and finish it.
About one-third of the app is still missing, mainly reservation of restaurants and beautysalons.

The project is built with a standard and clean stack:
• Mobile app: Flutter
• Backend: C# (.NET Core)
• Admin panel: Next.js

We are looking for a highly skilled, detail-oriented developer who can prioritize this project as a top task and work in a structured, careful, and professional way.

???? What we need from you
• Take over an existing codebase (no rebuilding from scratch)
• Carefully review the current Flutter app, backend, and admin panel
• Complete missing core features (approx. 30–35% of the app), including:
- Restaurant and other business reservation system (end-to-end)
- Payment integration for:
? Transfers
? Tours
• Connect frontend (Flutter) with backend APIs
• Fix bugs and ensure stability
• Prepare the app for App Store & Google Play release

???? What is VERY important to us
• You are experienced and technically strong
• You build user-friendly mobile apps with attention to detail
• You can prioritize this project and work consistently until completion
• You communicate clearly and regularly

? Required experience
• Strong experience with Flutter
• Experience ---------- Core backend
• Experience with Next.js or React
• Experience with payment systems
• Experience taking over and finishing existing apps
• It would be a strong advantage if you are detail-oriented and consistently focus on building the most user-friendly solutions.

???? Please include in your proposal
1. Your experience with Flutter + .NET Core + Next.js
2. Examples of similar apps you have finished
3. How you think you would take over this existing project
4. Your hourly rate and availability (hours per week)

? Not a fit if you:
• Want to rebuild everything from scratch unless its necessary
• Cannot work carefully with existing code
• Cannot prioritize this project
• Cannot communicate clearly and regularly

We need help urgent, and you should start as soon possible.
You will always receive payment for your work., but payment will be made only for work that is being done on the project . We will not make advance payments, as we have previously experienced issues with prepayment.