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Low Latency Switching in Signal

Company: Signal · Jan 31, 2013
Platform: Android

Signal's team discovered that building encrypted voice calls was easy. Building a VoIP system that actually worked well? That was the hard part.

LinkedIn Engineering discovered that one synchronous file write operation tanked their Node.js throughput from thousands of requests per second to just dozens.

SoundCloud's mobile team hit a wall: their API-first approach broke down when browsers couldn't handle CORS redirects properly. Their solution? A proxy architecture that evolved from nginx to Node.js.

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