FlutterFlow Marketplace Backend Development (Supabase, Payments, Shipping & Responsive Web)

I already have a complete FlutterFlow UI template for a premium luxury marketplace application. The UI/design template will be provided to the selected developer.

The goal of this project is to transform the existing UI into a fully functional marketplace application by implementing the backend, database, authentication, business logic, payment integrations, shipping integrations, notifications, and admin dashboard.

The project **must be developed using FlutterFlow**.

The backend **must use Supabase**.

The final project must support:

* Android
* iOS
* Responsive FlutterFlow Web

The web version **must also be built inside FlutterFlow**, using the same project and the same Supabase backend. It should adapt correctly to desktop, tablet, and mobile layouts using FlutterFlow responsive features.

The existing UI should **not** be redesigned unless absolutely necessary. The focus of this project is implementing the backend, connecting the existing UI to real data, and making every feature fully functional.

---

# Technology Stack

* FlutterFlow
* Supabase
* PostgreSQL
* Supabase Auth
* Supabase Storage
* Supabase Realtime
* Supabase Edge Functions (only if required)
* PayPal API
* Klarna API
* DHL API
* Hermes API

---

# Application Language

The application is for the German market.
---

# Main Features

## 1. User Authentication & Profiles

* Email Login
* Email Signup
* Google Login
* Apple Login (if supported)
* Password Reset
* Logout
* User Profiles
* Profile Photo
* Username
* Bio
* Location
* Seller Rating
* Reviews Count
* Sales Count

---

## 2. Marketplace Listings

Users can:

* Create Listings
* Edit Listings
* Delete Listings
* Archive Listings

Each listing contains:

* Multiple Images
* Brand
* Title
* Description
* Category
* Subcategory
* Product Size
* Color
* Material
* Condition
* Price
* Original Price
* Location
* Allow Offers
* Favorite Count
* View Count
* Status

Listing Status:

* Active
* Pending
* Sold
* Archived

---

## 3. Search & Filters

Global Search

Filters:

* Category
* Subcategory
* Brand
* Condition
* Price Range
* Product Size
* Location
* Shipping Method

Sorting:

* Newest
* Oldest
* Price Low → High
* Price High → Low

---

## 4. Favorites & Social Features

* Add Favorites
* Remove Favorites
* Saved Products
* Follow Sellers
* Unfollow Sellers
* Followers Count
* Following Count

---

## 5. Messaging & Offer System

* Realtime Buyer ↔ Seller Chat
* Read Status
* Send Image
* Offer System
* Submit Offer
* Accept Offer
* Reject Offer

---

## 6. Checkout & Payments

* Checkout Flow
* Purchase History
* Sales History
* Order Management
* Official PayPal API Integration
* Official Klarna API Integration

---

## 7. Reviews

* Seller Ratings
* Product Reviews
* Review Comments

---

## 8. Categories & Subcategories

Dynamic Categories

Dynamic Subcategories

Admin can:

* Create
* Edit
* Enable
* Disable

---

## 9. Shipping

Official API Integration

* DHL API
* Hermes API

Required Features:

* Shipping Label Generation (Versandlabels)
* Shipment Tracking (Sendungsverfolgung)
* Tracking Number Storage
* Shipping Status Updates
* User selects DHL or Hermes during Checkout

API credentials will be provided.

---

## 10. Notifications

* Push Notifications
* In-App Notifications
* Email Notifications

Notification Types:

* Messages
* Orders
* Offers
* Reviews
* Followers

Users must be able to manage notification preferences individually.

---

## 11. Email Notifications

* Registration Emails
* Password Reset Emails
* Order Update Emails
* Account Notifications

---

## 12. Reporting System

* Report Listing
* Report User

Admin can:

* View Reports
* Resolve Reports
* Close Reports

---

## 13. Admin Dashboard

Admin Features:

* User Management
* Seller Management
* Listing Management
* Order Management
* Transaction Management
* Category Management
* Subcategory Management
* Review Management
* Report Management
* Moderation Tools

Marketplace Statistics:

* Total Users
* Total Listings
* Total Orders
* Total Revenue
* Active Reports

---

## 14. Supabase Database

Create and configure:

* Database Schema
* Relationships
* Storage Buckets
* Row Level Security (RLS)
* Realtime
* User Permissions
* Admin Roles

Required Tables:

* profiles
* listings
* categories
* subcategories
* favorites
* followers
* offers
* chats
* messages
* orders
* reviews
* reports
* notifications
* notification_preferences
* admin_stats

---

## 15. Project Requirements

* No fake data
* No placeholder backend logic
* No broken buttons
* No duplicated database tables
* No duplicated backend logic
* Secure API implementation
* Secure Supabase configuration
* Clean FlutterFlow project
* Clean database structure
* Existing UI should remain unchanged
* Connect every existing screen to real backend data
* Fully functional Android, iOS and FlutterFlow Web versions

---

# Future Phase (Not Included)

The following features are planned for a later phase:

* Verified Seller Badge
* Trusted Seller Badge
* Email Verification
* Two-Factor Authentication (2FA)
* QR Shipping
* Buyer Protection
* Dispute Management
* Gift Marketplace
* AI Recommendations

---

# What I Expect From You

Please apply only if you have experience with:

* FlutterFlow
* Supabase
* Marketplace Applications
* Realtime Chat
* Payment APIs
* Shipping APIs

Please include in your proposal:

1. Similar FlutterFlow marketplace projects
2. Experience with Supabase
3. Experience with PayPal & Klarna APIs
4. Experience with DHL/Hermes APIs
5. Estimated delivery time
6. Fixed price
7. What you need from me before starting

If this project is completed successfully and we have a good collaboration, I would be happy to continue working with the same developer on Phase 2 and future enhancements.


The UI template will be provided. Your main responsibility is implementing the backend, integrating all APIs, building the database, connecting every screen to real data, and delivering a fully functional marketplace application.