Scalable Multivendor SaaS eBook Marketplace

Role: Lead Full-Stack & Systems Engineer
Stack: Flutter (Android, iOS, Web), Laravel REST API, MySQL, Firebase, Stripe, PayPal, Razorpay, Flutterwave
Architecture: Cross-Platform Marketplace with Multi-Gateway Payment Infrastructure

Overview

Architected and engineered a production-grade multivendor digital publishing SaaS platform enabling entrepreneurs, publishers, and independent authors to launch scalable online bookstores across mobile and web platforms.

Designed to support high-volume digital content distribution, global payment processing, automated commission structures, and enterprise-level administrative control — all within a modular API-driven architecture.

Built with scalability, monetization flexibility, and global commerce readiness at its core.

Key Engineering Highlights

• Cross-platform Flutter architecture (Android, iOS, Web)
• Modular Laravel REST API backend
• Automated commission & revenue distribution engine
• Multi-gateway global payment integration
• Secure multi-format digital content delivery (eBook + Audiobook)
• Multilingual + RTL-ready architecture
• Vendor onboarding & approval workflow system
• Real-time push notification system via Firebase

Core Platform Capabilities

Multivendor Marketplace Engine

• Vendor onboarding with admin approval workflow
• Configurable commission and revenue models
• Vendor dashboards with revenue and sales analytics
• Self-publishing infrastructure for independent authors

Digital Content Infrastructure

• Secure distribution of PDF & EPUB formats
• Audiobook support
• Structured taxonomy for optimized content discovery
• Content lifecycle management tools

Authentication & Access Control

• Google OAuth & Apple Sign-In
• OTP-based phone authentication
• Email/password authentication
• Role-based access control (Admin, Vendor, Customer)

Monetization & Revenue Systems

• Commission-based marketplace model
• Free & paid content support
• Advertisement integration (banner, interstitial, rewarded)
• Tax rules, coupons, and discount engine

Global Payment Infrastructure

• Multi-gateway abstraction layer
• Stripe, PayPal, Razorpay, and Flutterwave integration
• Secure transaction workflows
• Extensible architecture for additional gateways

Order & Financial Management

• Automated invoice generation
• Refund and dispute workflows
• Transaction logging & CSV export tools
• Advanced sales filtering by vendor, content type, and date

Technical Architecture

Frontend Engineering (Flutter)

• Unified cross-platform architecture
• Adaptive responsive UI
• Optimized state management
• Performance-tuned API consumption

Backend Engineering (Laravel REST API)

• Modular service-layer architecture
• Secure authentication & middleware enforcement
• Optimized mobile-first API response handling
• Fully dynamic admin configuration system

Database & Performance Engineering

• Normalized MySQL relational schema
• Indexed queries for high-volume transactions
• Structured vendor, asset, and order modeling

Notification Infrastructure

• Firebase Cloud Messaging (FCM) integration
• Real-time system alerts & promotional messaging

Localization & Accessibility

• Multilingual support
• RTL layout compatibility
• Dynamic dark/light mode detection
• Cross-platform UI consistency

Impact

• Engineered a scalable multivendor SaaS marketplace architecture
• Automated revenue and commission distribution at platform level
• Enabled global transaction processing across multiple gateways
• Delivered synchronized Android, iOS, and Web experiences
• Built a modular backend capable of platform expansion without structural refactoring