Cross-Platform SaaS Web Application (Desktop + Android Friendly) – gsmgenesis-style Reference

I am looking to build a custom SaaS web application that works smoothly on desktop and Android devices (mobile browsers).

The website gsmgenesis.com is only a functional reference for user flow and features.
Design, code, branding, and content must be completely original. This is NOT a clone.

The system must be built in a flexible and modular way, so that in the future I can change the business model (for example, shifting from Android services to selling digital products or gift cards) without rebuilding the platform from scratch.

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PLATFORM REQUIREMENTS
• Fully functional on desktop browsers
• Fully responsive and optimized for Android mobile browsers
• Clean UI/UX suitable for future mobile app integration
• Scalable architecture

(No native Android app required at this stage.)

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CORE FEATURES

User System
• User registration and login
• Email verification and password reset
• User dashboard
• Order history and status tracking

Wallet / Credits
• User wallet / balance system
• Credit deduction per order
• Refund logic for failed orders
• Full transaction history and logs

Services & Orders
• Service listing with pricing rules
• Order/request submission
• Order status management (pending, processing, completed, failed)

API-Based Automation
• Integration with third-party service APIs
• Secure API key storage
• Automated request handling
• Webhooks or polling for updates
• Error handling and retry logic
• Logging of all API requests and responses

Admin Panel
• Manage users and balances
• Manage services and pricing
• Manage orders
• API configuration
• Logs, reports, and manual overrides

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FUTURE FLEXIBILITY (VERY IMPORTANT)

The platform must be designed so that:
• Services can be replaced with digital products or gift cards
• Wallet system can be reused for new business models
• Pages, categories, and logic can be extended without major rewrite

This flexibility is a key requirement.

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SECURITY & PERFORMANCE
• Secure authentication (JWT or equivalent)
• Encrypted sensitive data
• Rate limiting and abuse prevention
• Audit logs
• Scalable and maintainable codebase

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TECHNOLOGY PREFERENCE
• Backend: Node.js (NestJS) or Laravel
• Frontend: React / Next.js
• Database: PostgreSQL or MySQL
• Queue/Workers: Redis or equivalent
• Hosting: VPS (AWS / DigitalOcean / Hetzner)
• HTTPS, backups, and deployment support

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DELIVERABLES
• Fully working SaaS web application
• Original source code (no reused or leaked scripts)
• Admin access and documentation
• Deployment assistance
• 30 days post-delivery support