The convergence of IoT, real-time data streaming, and modern frontend frameworks is redefining how engineers build enterprise monitoring systems. Over the course of designing and leading the Device IoT Platform — an enterprise-grade solution for real-time monitoring, configuration, and diagnostics of thousands of distributed network devices — I encountered and solved a core architectural challenge: how do you build a frontend dashboard that can handle hundreds of concurrent device telemetry streams without sacrificing performance, maintainability, or user experience?This article shares the architectural patterns, technology decisions, and hard-won lessons from that journey — covering the full stack from MQTT ingestion to Vue 3 reactivity to Kafka-backed event processing.