// TOPIC
#real-time
2 articles
◆◆IntermediateLaunchDarklyStatsig
01Designing a Feature Flag Service
An in-house LaunchDarkly. Distributing config with sub-100ms freshness to thousands of services, targeting rules, and the safety properties that prevent a flag flip from taking the site down.
#case-study#configuration#distributed-systems
19 min◆◆IntermediateSlackDiscord
02Real-Time Communication Patterns
Short polling, long polling, Server-Sent Events, WebSockets, WebTransport, and HTTP/2 push — when each wins, how each fails, and how to pick for your use case.
#networking#real-time#websockets
16 min