Real-time apps: chat, notifications, video calls

Messengers, live dashboards, and in-app chat that update instantly for every user.

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Real-time features look simple in a demo and break in production: a connection drops, a message is sent twice, a user is online on two devices. We build them on proven patterns — an outbox with a background dispatcher, idempotency keys for every send, presence stored in Redis — so they keep working under real load.

We use SignalR for messages, statuses, and notifications, and WebRTC for audio and video calls, with the server handling only signaling. In the cloud the hub scales out through Azure SignalR Service or a Redis backplane.

Real-time can be a product on its own (a messenger) or a layer on top of an existing service: order status updates, chat between buyer and seller, live admin dashboards.

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