Relay
A real-time chat backend handling presence and delivery at scale over WebSockets.
Relay is a real-time messaging backend built on the BEAM. Phoenix Channels keep thousands of concurrent connections alive, while a presence layer tracks who’s online and an at-least-once pipeline guarantees delivery.
Highlights
- Soft-realtime fan-out to thousands of concurrent sockets.
- Distributed presence tracking with no central bottleneck.
- At-least-once delivery with idempotent client reconciliation.
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