IoT monitoring dashboard for vaccine cold chains. Delivers 4,500+ messages/sec to concurrent clients with sub-350ms p95 latency over WebSockets and Redis PubSub, with Recharts visualizing 100K+ data points and a Node.js simulation engine generating synthetic sensor data.

• Websitehttps://www.coldtrace.app
• Sourcehttps://github.com/utoker/coldtrace
• Built withNext.js / React / GraphQL Subscriptions / Node.js / Redis / Zustand / Recharts