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June 24, 2025

Scaling Voice AI at MasterClass with Effect & TypeScript #3

1 hour 9 minutes

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.

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(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

...more

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By Effectful Technologies Inc.