System 02 · Privacy & Realtime
Privacy-First Real-Time Support Chat Engine
Business Problem
European companies face heavy regulatory fines if they deploy US-hosted chat pixels that inject third-party tracking cookies or transfer consumer chat transcripts across international borders without explicit consent.
System Architecture
Rust asynchronous WebSocket server on port 8002, in-memory Redis cluster for agent presence pub/sub, encrypted-at-rest PostgreSQL transcript archive, and a zero-dependency vanilla TypeScript embed widget (<12 KB gzipped).
Engineering Highlights
Ephemeral sessionStorage token binding (zero cookies stored), client-side message reconnection buffers for flaky mobile signals, automated cron worker for 30-day retention pruning (GDPR Art. 5(1)(e)), and instant visitor data purge endpoint (GDPR Art. 17).
Tangible Business ROI
Enables responsive live sales support without failing corporate enterprise privacy audits, packaged in an ultra-lightweight widget that leaves web core vitals untouched.