I need a robust, multi-tenant SaaS platform that lets pathology labs offer online test booking through a web portal plus companion Android and iOS apps. The system will recognise three distinct roles—Admin, Lab technician and Customer—each with its own dashboard and permissions. Core modules cover end-to-end test booking and scheduling, secure user authentication with profile management, and seamless payment processing. I will rely on popular payment gateways, real-time SMS / Email notifications and WhatsApp messaging for status updates, as well as built-in analytics to monitor booking volumes, revenue, and turnaround times. Key deliverables • Cloud-hosted web portal, white-label ready for multiple labs • Native or cross-platform mobile apps (Android & iOS) that mirror portal features • Role-based dashboards for Admin, Lab technician and Customer • Booking calendar with slot management, sample pickup option and live status tracking • Integrated payment flow with receipts and refund handling • Notification engine tying into SMS, Email and WhatsApp APIs • Analytics panel with exportable reports • Source code, deployment scripts and a short hand-off guide Acceptance criteria • All listed features demonstrably working on a staging server and both app stores • Responsive UI, load-tested for at least 1,000 concurrent users • Clean, well-commented codebase and API documentation Mention your preferred stack, any relevant lab-healthcare projects you have shipped, and an indicative timeline so we can move straight into milestones.