Healthcare App
Healthcare appointment booking with constraint-backed slot locking, so concurrent requests cannot double-book, and payment bound to the booking transaction.
01 // Overview
Healthcare Platform
Full appointment booking and management system.
Real-time Bookings
Live appointment scheduling system.
Payment Integration
Online payments for appointments.
Responsive UI
Works seamlessly on all devices.
Engineering
The Decisions Behind It.
What made this hard?
Double booking is the most common failure in appointment systems, and in a healthcare context it is not an inconvenience, it is a trust problem.
How was the system structured?
Slot availability is enforced by database-level constraints rather than trusting application logic alone, so concurrent bookings cannot double-book even in a race. Payment confirmation and booking confirmation are bound inside one transaction boundary.
What does the codebase look like now?
Timezone handling goes through a central utility, which is critical for cross-region appointments. Cancellation and reschedule flows are modelled as explicit states rather than deletions, so the history stays intact.