CLOUD
16 September 2026 · 9 MIN READ
Build a Live Audience Voting Game for Your Conference Talk in a Weekend (Serverless, Zero Paid Tools)
For a conference session I co-delivered, I wanted a hundred-plus people swiping live votes on their phones — without Mentimeter, without Kahoot, and without a single credential in the JavaScript bundle. The whole backend is three DynamoDB tables behind an IAM-authenticated AppSync API: a singleton GameState row drives lobby, launch, reveal and podium; Cognito guest identities sign every call with SigV4; votes are namespaced by runId so a reset hides everything without deleting anything. Total AWS bill for the event: under a dollar.
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