API SERVICE

WANOTIF GATEWAY

CLIENT / CONTEXTJakarta, ID — Enterprise Clients

ROLEFULL-STACK & CREATIVE ARCHITECT

TECH STACKNode.js • Express • Redis • WhatsApp Business API • PostgreSQL

YEAR2024

The Challenge

Businesses needed a rock-solid, cost-effective transactional WhatsApp notification relay for one-time passwords (OTP), invoice reminders, and dispatch alerts without recurring per-seat fees.

Business Impact

99.8% on-time delivery under 2.5 seconds.
Handles 50,000+ daily messages during peak promotional spikes.
Integrated fallback to SMS gateway in case of delivery timeouts.

Technical Architecture & Solution

Built as an event-driven queue-worker architecture leveraging Redis Bull queues with exponential backoff and rate limiting adhering to Meta's strict throughput guidelines.

Key Architectural Decisions

Queue Isolation: Dedicated queues for high-priority OTPs versus bulk dispatch.
Dead Letter Handling: Automatic failed message inspection and retry workflows.
Audit Logging: Tamper-proof message status log in PostgreSQL.

VISUAL SHOWCASE // SYSTEM INTERFACES

2 PLATES