SMS App for Salesforce Messaging - Send SMS | WhatsApp from Salesforce | CTI Calling App

I need an experienced Salesforce Developer to build a complete SMS & WhatsApp Messaging App inside Salesforce.
The goal is to allow Salesforce users to send & receive SMS and WhatsApp messages directly from the Salesforce UI using a connected messaging provider (Twilio / Gupshup / WhatsApp Cloud API).

The app should include a CTI-like interface, real-time chat, custom objects for storing messages, and automation support.

Key Features Required
*Messaging Features

Send and receive SMS from Salesforce

Send and receive WhatsApp messages from Salesforce

Two-way messaging inbox

Docked CTI-style chat window (Utility Bar Component)

Support for text, emoji, templates, and attachments

*Salesforce Development Requirements

Lightning Web Components (LWC) chat interface

Apex classes for outbound/inbound messages

Custom Objects for storing messages

Real-time refresh using Platform Events / CometD

Inbox list view + chat detail view

Search, filters, and message history

*Integrations Required

Twilio OR Gupshup OR WhatsApp Cloud API

Webhook endpoint for receiving messages

Authentication + security setup

Error handling and retry mechanism

*Automation Features

Auto-reply workflows

Follow-up sequences

Triggers based on Lead/Contact/Case events

Bulk SMS and WhatsApp campaign support

Template management (using Custom Metadata or Custom Objects)

*Admin & Extra Features

Permission sets for user access

Dashboard for total messages, delivery status, etc.

Multi-agent chat assignment

Org-ready installable package (Managed or Unmanaged)

*Ideal Freelancer

Strong experience in:

Apex, LWC, Aura (optional)

Salesforce APIs & Integration

Twilio / Gupshup / WhatsApp Cloud API

Experience building CTI / communication apps

Ability to deliver a fully working, production-ready app

*Budget

Flexible — open to reasonable proposals.
Please share:

Similar Salesforce apps you’ve built

Live demos or screenshots

Your estimated timeline + cost

*How to Apply

Please send:

Your experience summary

Relevant project links

Your preferred tech stack (Apex + LWC + provider)

Estimated duration and price