# How Notion Rebuilt Its Sync Engine for Offline-First

Page: https://stenobird.com/podcast/the-cto-podcast-with-fexingo-technical-leadership-architecture-and-engineering-org-7871807/how-notion-rebuilt-its-sync-engine-for-offline-first
Text version: https://stenobird.com/podcast/the-cto-podcast-with-fexingo-technical-leadership-architecture-and-engineering-org-7871807/how-notion-rebuilt-its-sync-engine-for-offline-first.md
Podcast: [The CTO Podcast with Fexingo: Technical Leadership, Architecture, and Engineering Org](https://stenobird.com/podcast/the-cto-podcast-with-fexingo-technical-leadership-architecture-and-engineering-org-7871807)
Published: 2026-06-24T19:53:24+00:00
Episode link: https://audio.fexingo.com/business/the-cto-podcast/episode-0071.mp3
Audio file: https://audio.fexingo.com/business/the-cto-podcast/episode-0071.mp3
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JSON: https://stenobird.com/v1/public/podcasts/the-cto-podcast-with-fexingo-technical-leadership-architecture-and-engineering-org-7871807/episodes/how-notion-rebuilt-its-sync-engine-for-offline-first
Duration seconds: 645

## Resource

Lucas and Luna dive into Notion's technical journey to rebuild its block-based sync engine for offline-first and real-time collaboration. They explore the architectural shift from optimistic local writes to a hybrid local-sync model, the challenges of conflict resolution with operational transforms, and how Notion handled state reconciliation for millions of users. Specific numbers: over 100 million blocks synced daily, sub-second latency for local writes, and a 40% reduction in sync errors post-migration. The episode also touches on the trade-offs between local-first and server-authoritative models, and what other builders can learn from Notion's engineering decisions. #Notion #OfflineFirst #SyncEngine #LocalFirst #OperationalTransform #ConflictResolution #RealTimeCollaboration #BlockEngine #Engineering #Architecture #TechLeadership #CTO #Business #Technology #FexingoBusiness #BusinessPodcast #Scaling #SoftwareEngineering Keep every episode free: buymeacoffee.com/fexingo

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