The Challenge
Distributed Message Orchestration
Handling thousands of concurrent WhatsApp sessions and ensuring message delivery across various network conditions requires a system that is both fast AND reliable. Node.js is great for logic, but high-performance dispatch needs a more memory-efficient approach.
Real-Time State Sync
Keeping the dashboard updated with device connection status, QR code generation, and delivery ticks in real-time without refreshing the page.
The Solution
Polyglot Infrastructure
Implemented a hybrid microservices architecture:
- NestJS (API): Handles complex user management, subscription logic, and RBAC.
- Go (Fiber): A dedicated high-performance worker for managing raw WhatsApp socket connections and fast message dispatching.
Real-Time Pipeline
Integrated Socket.io across the stack to push connection states and message events directly from the Go/Node services to the Next.js frontend, ensuring sub-second feedback for admin users.
Security-First Authentication
Utilized the latest NextAuth.js v5 (Beta) for the dashboard, providing robust session management and OIDC support while maintaining compatibility with the multi-repo structure.
Technical Impact
Superior Scalability
The Go worker significantly reduces CPU and RAM overhead for connection management compared to a pure Node.js implementation.
Modern DX
Zero-knowledge pairing via dynamic QR codes in the web dashboard makes onboarding new WhatsApp devices seamless for enterprise clients.