Case Study: How Duolingo reached 12x faster time to resolution with Sentry
Key results
The challenge
Duolingo operated more than 200 microservices with multiple daily deployments, but debugging queries could take up to 30 minutes and only one engineer could query at a time. Legacy monitoring created alert fatigue and left most engineers unable to resolve issues independently.
The solution
Duolingo migrated its 200+ microservices to Sentry in under two weeks, adding real-time queries, dashboards, custom tags for experiments and feature flags, and PagerDuty integration for urgent alerts.
“Sentry has saved years of my life by making it faster to find trends and errors. What used to take hours of going between tools now happens instantly.”
MHMaggie HewittEngineering Manager, Duolingo
The results, in context
Duolingo reported 12x faster time to resolution, a 3x reduction in debugging time in key workflows, and 99.9% uptime, after migrating 200+ microservices to Sentry in under two weeks. The figures are quoted from Sentry's published customer story and dated to when sourced, July 24, 2026.