WhatsCode: Large-Scale GenAI Deployment for Developer Efficiency at WhatsApp — Mao et al. (2026)
The deployment of AI-assisted development tools in compliance- relevant, large-scale industrial environments represents significant gaps in academic literature, despite growing industry adoption. We report on the industrial deployment of WhatsCode, a domain- specific AI development system that supports WhatsApp (serv- ing over 2 billion users) and processes millions of lines of code across multiple platforms. Over 25 months (2023-2025), WhatsCode evolved from targeted privacy automation to autonomous agentic workflows integrated with end-to-end feature development and DevOps processes…
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