eCommerce Goods Trading App

We are looking for Experienced Full Stack Developer to develop Mobile Phones Trading app and website in flutter. Source code of the project will be handed over to us whenever we require. You will have to arrange APIs of SMS or other APIs, Google Maps or any other APIs. Payment gateway will be provided by us to you. Payment will be made in milestones only. 25% + 35% + 40% payment plans will be followed. There will be two panels. Admin Panel User panel (One Mobile number can be used only once to register on our platform. User once register, need not to logout from account again and again, user can not delete their account. When user will register, app should ask their location, contacts, media etc.) Admin panel on web (Admin should be able to see all the activities of the app in their panel. Admin will be able to see all downloads, all sales, all partners list, add or block any user, suspend or terminate or reinstate any user anytime. Admin can see any reports by customised dates. Admin can see sales, downloads, between any two dates. Admin can reply or close any support ticket raised by any users.) Admin should be able to see total sales daily, total number of downloads daily, total number of monthly active users, total number of website traffic, total number of help and support submissions and can reply. Admin should have the option to give partial refund or full refund to users. This will be a mobile trading platform. It will work like Olx somehow. There are many people who buy products in offers on Amazon, Flipkart and other eCommerce Marketplaces and they sell it in offline market. We want that when user will download our app and sign up and login. Then there should be two options. I want to buy. I want to Sell. When user will click 'I want to buy' then he/she will have to fill a form and post requirements like. I want to buy 500 pieces of iPhone 14 128 GB, color options or any colors and post requirements. Then this post will go to admin first and then admin will check the post immediately and approve or disapprove it. If it is approved then it should go live and user should get notification on their panel that their post is live. If it is disapproved then also user should get a notification then your post can not go live, please edit and post again or whatever reason. When any user will open their app, all live posts should be visible to them. Any user can place any bid on any post. When any user will place any bid, its notification will go to that user who posted that post. If that user will accept the bid then they can ask mobile number of each other. For getting mobile number of each other, both users will have to pay Rs.50/- each of them. Users can not chat with each other. Users can not show mobile number to each other. Users can post daily price of any specific mobile or other gadgets or items in their respective market. It should be visible to all. Any users should be able to see their past bids or post history in their accounts. There should be push notifications option.