How Halkyone Clinical OS Uses SignalR for Secure Real-Time Patient Telemetry

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A technical deep dive published on DEV Community details the architecture behind Halkyone Clinical OS, a healthcare platform that uses Microsoft's SignalR to enable real-time communication between .NET backends and React frontends. The system employs three specialized hubs — ChatHub, TelemetryHub, and NotificationHub — to handle distinct data streams including live cardiac vitals such as heart rate and SpO2 at sub-second intervals. A privacy safeguard using the Haversine Formula automatically obfuscates clinician location coordinates to (0,0) when they come within 500 metres of a patient's home address. The platform also implements optimistic UI patterns in Next.js, assigning temporary UUIDs before permanent database IDs are confirmed following a successful WebSocket broadcast. Additional engineering challenges addressed include multi-device read-state synchronization, database-to-WebSocket consistency, and fault-tolerant persistent connections.

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