🏢 Grameen Foundation Scale Project • Sector: Corporate / Telecom

WhatsApp Cloud API Stakeholder Communication Gateway

Engineered automated institutional notification and webhook pipelines connecting program databases to the official WhatsApp Business Cloud API. Facilitated rapid dissemination of agricultural advisory alerts, training schedules, and beneficiary acknowledgments at near-zero per-message delivery latency.

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Client / Partner Organisation 🏢 Grameen Foundation Scale Project
Sector Domain Corporate / Telecom
Role Title & Timeline Full-Stack Integration Architect (2023 – 2024)
Broadcast Alerts Sent 50,000+
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Architectural Breakdown & Implementation

Enterprise Messaging

High-Throughput Communication Need

Timely dissemination of weather advisories, pest control alerts, and market price updates is vital for agricultural producers. Traditional SMS suffered from low read rates and prohibitive per-message fees, prompting the design of a scalable institutional broadcast gateway leveraging the official Meta WhatsApp Business Cloud API.

Microservice Architecture & Webhook Engine

Constructed an asynchronous, lightweight event-driven messaging layer in PHP 8. Incoming webhooks are immediately verified using SHA-256 HMAC tokens and queued for processing to avoid connection timeouts. Outgoing campaigns are parsed through rate-limit throttlers with automatic exponential backoff to ensure 100% compliance with Meta throughput quotas.

Proven Reach & Engagement

Over 50,000 verified alert broadcasts and automated inquiries have been delivered with a 94%+ open rate within 15 minutes of transmission, radically improving stakeholder engagement at near-zero incremental delivery overhead.

Core Modules & Deployed Deliverables

Secure Webhook Listener & Signature Verification Engine
Broadcast Scheduler with Dynamic Variable Interpolation & Fallback Handling
Interactive Quick-Reply Menu Navigation & Beneficiary Triage Pipeline
Delivery, Read Receipt, and Opt-Out Audit Telemetry Dashboard

Engineering Challenges Tackled & Solved

Meta API rate-limiting thresholds during high-volume batch broadcasts.
Asynchronous webhook handling requiring sub-500ms HTTP 200 acknowledgments.
Multi-lingual text encoding for regional Hindi and Hinglish agronomic advisories.

Systems Architecture & Data Pipeline Strategy

PHP 8 event-driven webhook processor + MySQL queue tables + Redis caching + Meta Graph API v18.0.