You will get Timezone-aware appointment booking API for NestJS
Project details
I’ll build a timezone-aware appointment booking backend for your existing Node.js, NestJS, or Next.js application. It will calculate available slots from your business rules, prevent overlapping bookings, and expose clean APIs that your frontend or automation can use.
Starter covers one bookable service or resource with recurring availability, timezone-aware slot generation, booking creation, and conflict checks. Standard adds date-specific overrides, rescheduling, cancellation, and stronger transactional overlap protection. Advanced adds Google Calendar OAuth and one-calendar event create/update synchronization.
This backend-focused project is for consultations, services, staff members, or other bookable resources. I build NestJS scheduling systems with PostgreSQL, timezone conversion, conflict prevention, and Google Calendar OAuth.
You’ll receive source-code changes, documented endpoints, and setup notes. A complete frontend, payments, reminders, multi-location or group bookings, multiple calendar providers, and a Calendly-style platform are outside this fixed scope. Message me first if you need a full platform rather than one defined booking flow.
Starter covers one bookable service or resource with recurring availability, timezone-aware slot generation, booking creation, and conflict checks. Standard adds date-specific overrides, rescheduling, cancellation, and stronger transactional overlap protection. Advanced adds Google Calendar OAuth and one-calendar event create/update synchronization.
This backend-focused project is for consultations, services, staff members, or other bookable resources. I build NestJS scheduling systems with PostgreSQL, timezone conversion, conflict prevention, and Google Calendar OAuth.
You’ll receive source-code changes, documented endpoints, and setup notes. A complete frontend, payments, reminders, multi-location or group bookings, multiple calendar providers, and a Calendly-style platform are outside this fixed scope. Message me first if you need a full platform rather than one defined booking flow.
Programming Languages
JavaScript, TypeScriptCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$99
|
Standard
$249
|
Advanced
$449
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 7 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 1 | 2 | 2 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Additional Revision
+$25
API Documentation
(+ 1 Day)
+$50
Deployment Assistance
(+ 1 Day)
+$75Frequently asked questions
About Muhammad
Node.js Backend & API Integration Developer | NestJS, Stripe
Sheikhupura, Pakistan - 5:45 pm local time
I can help you with:
- REST API and backend feature development
- Third-party API integrations
- Webhook verification, event processing, retries, replay, and monitoring
- Stripe Checkout, subscriptions, and payment webhooks
- Authentication, authorization, and role-based access
- PostgreSQL and MongoDB database development
- Background jobs and scheduled processing with BullMQ
- Debugging, refactoring, and improving existing backends
Selected project work:
- Multi-timezone scheduling backend: Built a reusable NestJS scheduling backend with recurring availability, date overrides, timezone-aware slot generation, JWT authentication, PostgreSQL persistence, transactional overlap prevention, public booking endpoints, and Google Calendar OAuth.
- Webhook monitoring backend: Developed authentication, REST APIs, database design, event processing, latency tracking, webhook inspection, replay, and AWS deployment for a product used by development teams.
- Behavioral assessment backend: Built REST APIs for assessment flows, multidimensional scoring, personalized results, authentication, role-based access, admin workflows, PostgreSQL data models, and Stripe one-time payments for a client-commissioned MVP.
I also work with Next.js and React, so I can handle frontend touchpoints when a backend feature or integration needs them.
Share your current technology stack, the backend feature or API integration you need, and any relevant documentation. I’ll review the scope and explain how I would approach it.
Steps for completing your project
After purchasing the project, send requirements so Muhammad can start the project.
Delivery time starts when Muhammad receives requirements from you.
Muhammad works on your project following the steps below.
Revisions may occur after the delivery date.
Confirm booking rules and backend scope
Review the repository, resource model, availability rules, time zones, duration, and selected package.
Build timezone-aware availability APIs
Implement recurring availability, overrides, slot generation, validation, and documented endpoints.