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ABS - Enterprise Appointment Booking System

A white-label, multi-tenant SaaS platform for appointment scheduling across healthcare, fitness, beauty, and service industries. Features complete appointment lifecycle management with staff scheduling, customer profiles, payment processing (Stripe), multi-channel notifications (Email, SMS, Push), Google Calendar sync, and real-time analytics dashboard.

25+ domain entities

entities

6+ third-party APIs

integrations

Web, Android, Windows

platforms

Technical Implementation

Built using Clean Architecture with .NET 9, Blazor WebAssembly, and .NET MAUI for cross-platform support. Implements SignalR for real-time updates, Hangfire for background jobs (reminders, log cleanup), JWT authentication with role-based access control. Integrated with Stripe for payments, SendGrid for email, Twilio for SMS, and Firebase for push notifications. Features comprehensive reporting with FastReport and Excel export via ClosedXML.

Key Features

Complete appointment lifecycle: Create, confirm, reschedule, cancel, no-show tracking

Recurring appointments support: Daily, Weekly, Bi-Weekly, Monthly patterns

Customer management with history, spending analytics, and loyalty tracking

Staff scheduling with availability, time-off requests, and max daily limits

Multi-branch support for enterprise organizations

Stripe payment integration with deposits, refunds, and transaction history

Multi-channel notifications: Email (SendGrid), SMS (Twilio), Push (Firebase)

Google Calendar two-way sync for staff appointments

Wait list management with automated notifications

Customer reviews and ratings system

Coupon and discount management

Real-time dashboard with SignalR live updates

Comprehensive reporting with FastReport and Excel export

Architecture & Patterns

Clean Architecture with Domain, Application, Infrastructure, Presentation layers

CQRS pattern with MediatR for command/query separation

Generic repository pattern with Entity Framework Core 9

JWT Bearer authentication with refresh token rotation

Role-based access control with granular permissions

Background job processing with Hangfire (reminders, log cleanup)

Real-time communication via SignalR hubs

.NET Aspire for distributed application orchestration

Multi-tenancy with UserId-based data isolation

FluentValidation for input validation

Mapster for object-to-object mapping

OpenTelemetry for observability and monitoring

Project Highlights

Production-ready SaaS with multi-tenant architectureCross-platform: Blazor WebAssembly (Web) + .NET MAUI (Android, Windows)25+ domain entities with comprehensive business logic6+ third-party integrations (Stripe, SendGrid, Twilio, Firebase, Google APIs)Comprehensive test suite with xUnit, Moq, and FluentAssertionsAPI documentation with Swagger/OpenAPIHealth checks and monitoring endpointsResponse compression (Gzip & Brotli)Rate limiting for API protectionDocker containerization support

Technology Stack

.NET 9Blazor WebAssembly.NET MAUIPostgreSQLEntity Framework Core 9SignalRHangfire.NET AspireStripeSendGridTwilioFirebaseGoogle Calendar APIMudBlazorxUnitDocker

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