EBook E-Commerce Earning App

Overview

A complete ebook marketplace app where users can browse categories, preview books, purchase with in-app coins, and read directly in the app. A coin reward system incentivizes engagement — users earn coins by reading, reviewing, and referring friends. The codebase follows Clean Architecture strictly: Domain (entities, use cases), Data (repositories, Firebase sources), and Presentation (Riverpod providers, widgets).

Tech Stack

Key Contributions

• Implemented strict Clean Architecture — domain layer has zero Flutter/Firebase imports, making use cases fully unit-testable.
• Riverpod StateNotifierProvider for cart, wishlist, reading progress, and coin balance — all independently reactive.
• Built an in-app PDF/epub reader with reading progress persistence to Firestore.
• Coin reward system with transaction ledger stored in Firestore with atomic batch writes to prevent race conditions.
• Pagination with Firestore cursors for the book catalog — smooth infinite scroll with no visible loading jumps.

Screenshots

Results & Learnings

This is my most architecturally mature Flutter project. Clean Architecture made adding the coin system post-launch effortless — a new use case and repository method, zero changes to existing presentation code.