GSendr - WhatsApp & Email Campaigns. One Reply Desk.

Multi-channel campaign platform for organizations — Official WhatsApp Cloud API campaigns, personalised bulk email with per-recipient PDFs, and a shared reply desk that keeps every conversation tied to the campaign that started it.

2026 2 min read Full-Stack Developer View Project
Client: GSendr Owner: G6 Labs Asia
Next.js (App Router) TypeScript Tailwind CSS ShadCN UI Express.js PostgreSQL WhatsApp Cloud API Resend Chart.js Zod
GSendr - WhatsApp & Email Campaigns. One Reply Desk. screenshot 1GSendr - WhatsApp & Email Campaigns. One Reply Desk. screenshot 2GSendr - WhatsApp & Email Campaigns. One Reply Desk. screenshot 3GSendr - WhatsApp & Email Campaigns. One Reply Desk. screenshot 4

Problem Solved

Organizations needed to run email and WhatsApp campaigns across teams with stronger control over domains, templates, recipient handling, deliverability, and reply handling — but most tools treated channels as bolt-ons and left WhatsApp replies disconnected from the campaign that started them.

How I Solved It

I built a full-stack multi-tenant platform that unifies Official WhatsApp Cloud API campaigns, personalised bulk email (including per-recipient PDF attachments), recipient pipelines, and a shared WhatsApp reply desk in one operational system. Teams can send on email, WhatsApp, or both from the same audience, prove delivery, and answer replies with campaign context attached — engineered for high-volume multi-org sending with verified-domain governance and engagement analytics.

Key Features Delivered

  • Official WhatsApp Cloud API — Meta approved templates, bulk WhatsApp campaigns, delivery/read tracking, and multi org sending.
  • Shared WhatsApp reply desk — campaign linked conversations with free form replies inside Meta's 24 hour customer service window.
  • Personalised bulk email — HTML to PDF per recipient (invoices, statements, policies) matched to spreadsheet rows in one campaign.
  • Multi tenant organization model with scoped resources and teams.
  • Campaign lifecycle from draft to schedule/send with status controls.

What Can Be Done Next

  • Live — Email campaigns with verified domain sending, personalised attachments, and engagement analytics.
  • Live — Official WhatsApp Cloud API campaigns, templates, and shared reply desk (50K+ messages sent across organizations).
  • In development — AI Reply that drafts on brand WhatsApp responses from campaign + conversation context.
  • Planned — Voice Blast, SMS, deeper audience segmentation and lifecycle automation, expanded deliverability diagnostics, and stronger org level policy/compliance controls.