Contact person: Business Client

Phone:Show

Email:Show

Location: Milan, Italy

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"Project Overview

We need a developer to build a custom backend system that manages incoming messages from a central WhatsApp number and from 150 location-specific WhatsApp numbers, as well as messages from each location’s Instagram Direct and Facebook Messenger profiles.

Every location has its own social accounts and its own Google Calendar for appointments.

The system must automatically identify which location the user is referring to, guide the conversation, and create appointments in the correct calendar — all without human intervention.



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Required System Features

1. Channels to integrate

1 central WhatsApp number (brand-level entry point)

150 WhatsApp numbers (one for each location)

150 Instagram Direct inboxes (one per location)

150 Facebook Messenger inboxes (one per location)



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2. Location detection

Based on the user’s message (city name, area, location name, or keywords), the system must determine which of the 150 locations the user is asking for.


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3. Automated flow

Once the correct location is detected, the system must:

Send the user the official WhatsApp number of that location

Send the address of the location

Ask if they want to book an appointment

Retrieve available times from that location’s Google Calendar

Propose time slots

Confirm the booking

Create the event inside the correct location’s Google Calendar

Send confirmation to the user


Completely automated.


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Technical Requirements

WhatsApp Business API integration (central + 150 numbers)

Instagram DM integration via Meta Graph API (150 profiles)

Facebook Messenger integration via Meta Graph API (150 pages)

Google Calendar API (150 calendars)

Backend routing logic for 150+ locations

Scalable architecture

Logging, error handling, retry logic

Clean, maintainable code


No front-end is required.


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Preferred Technologies

Node.js or Python

Firebase / Supabase / PostgreSQL / MySQL

Cloud functions or serverless architecture (optional)



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Deliverables

Fully functional backend system

All integrations working

Documentation on how to add or remove locations

Support during initial setup" (client-provided description)