The problem Indian smallholder farmers don't lose crops because advice AgriNexus AI — a WhatsApp advisor that follows up until the The architecture (the bit devs will care about) Three decisions worth sharing: 1. EventBridge Scheduler > Step Functions Wait States 2. S3 Vectors > OpenSearch Serverless 3. Bedrock RAG with visible citations API Gateway + WAF → Lambda → SQS FIFO → Bedrock (Claude + Full article with architecture diagrams and ADRs: [article link] https://github.com/prasadt1/agrinexus-ai This is an AWS Builder AIdeas 2025 finalist. Community voting runs April 18–23 PT. If the architecture or the mission resonates: https://builder.aws.com/content/3C8hBRTcsRuQrHzE3Pq243yhXTF/aideas-finalist-agrinexus-ai (One-time ~30-sec sign-up with Amazon Builder.) Happy to answer technical questions in the comments.