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Cause & Effect

Scaling Voice AI at MasterClass with Effect & TypeScript #3

24 Jun 2025

Description

In this episode of Cause & Effect, Johannes Schickling had a conversation with David Golightly, Staff Engineer at MasterClass, to explore how his team built Cortex – a real-time voice AI orchestration layer that powers personalized conversations with celebrity instructors like Gordon Ramsay and Mark Cuban.Effect is an ecosystem of tools to build production-grade software in TypeScript.Website & docsCommunity & supportFollow us on X (Twitter)Github#Effect #TypeScript #Zendesk #softwareDevelopmentSong: Dosi & Aisake - Cruising [NCS Release]Music provided by NoCopyrightSoundsFree Download/Stream: http://ncs.io/CruisingWatch: http://ncs.lnk.to/CruisingAT/youtube (00:00) - Intro & David's background (04:56) - Discovering Effect & early impressions (08:32) - Why RxJS wasn’t enough for Cortex (16:15) - MasterClass On Call (19:10) - Building the orchestration layer (25:30) - Incremental adoption of Effect at MasterClass (31:43) - Text-to-speech component (40:08) - Error handling, observability, open-telemetry (01:01:20) - Looking ahead: Effect 4.0 & the future (01:08:00) - Closing thoughts

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