How I tried to make Japan's recycling system less confusing with Amazon Bedrock

Japan's recycling system is one of the most thorough in the world, and one of the most difficult to navigate if you are new to it. There are 1,741 municipalities in Japan, and almost every one has different rules. A PET bottle is not a single waste item: the body, cap, and label are three separate categories, and which bins they go into depends on where you live. The official guidance lives in printed pamphlets, often only in Japanese, updated annually. I built Gomi Bunrui to try and help with this. You point your phone camera at any waste item, get a breakdown of every component, and see exactly where each part goes based on the rules for your specific city. This post covers the technical details. The full competition write-up is on AWS Builder Center if you want the broader story. The Stack Frontend: React PWA deployed to S3 and CloudFront Auth: Amazon Cognito with email and social login, email confirmation, resend confirmation, and password reset Backend: Kotlin Lambda with SnapStar