Case Study: LaunchDarkly achieves faster, more reliable feature flag delivery with Fastly

LaunchDarkly’s 200-ms kill switch, built on Fastly for scalable control in real-time

LaunchDarkly, a feature management platform for enterprises, needed to deliver feature flags quickly and reliably at global scale while protecting performance and uptime. As its traffic and customer demands grew, it relied on Fastly to reduce flag update delays, handle surges, and keep releases safe for end users.

Fastly’s edge cloud platform, including Instant Purge, shielding, request collapsing, and real-time logs, helped LaunchDarkly serve trillions of feature flags with millisecond purge times and faster, more consistent updates. Fastly also absorbed a peak of 50,000 requests per second for several hours, enabling LaunchDarkly to handle unexpected launch traffic and improve update speeds by 90%.

LaunchDarkly

Arun Bhalla

Engineering Manager