I built a closed-loop WhatsApp advisor for 100M+ Indian farmers — fully serverless on AWS

The problem Indian smallholder farmers don't lose crops because advice doesn't exist. They lose them because advice arrives after the spray window closes. What I built AgriNexus AI — a WhatsApp advisor that follows up until the farmer confirms "हो गया" (done). The architecture (the bit devs will care about) Three decisions worth sharing: 1. EventBridge Scheduler > Step Functions Wait States Keeping a state machine open for 48h is expensive at scale. Step Functions completes in seconds; EventBrid