- Instant Messaging and the Signal Protocol - Computerphile
- The WhatsApp Architecture Facebook Bought For $19 Billion
- Scaling to Millions of Simultaneous Connections: Rick Reed
- What's Up WhatsApp? (Jan Koum, CEO at WhatsApp & David Rowan)
- yowsup WhatsApp Python Lib for Communication
- IBM Blog : XMPP Architecture
- WhatsApp Engineering at Scale : FB Blog
- How WhatsApp enables multi-device capability
- DIT — enabling de-identified data collection on WhatsApp
- Project LightSpeed: Rewriting the Messenger codebase for a faster, smaller, and simpler messaging app
- Data Transfer Project: Enabling portability of photos and videos between services