March 2, 2026

ABOUT THIS EPISODE

Join me in conversation with Sarah Zeng, who has gone from investing to operating at the forefront of AI - first as one of the first 50 employees at Character AI and now scaling Braintrust. Braintrust is a go-to platform for AI evals and observability. They recently announced their $80M Series B, led by ICONIQ and joined by returnees a16z, Greylock, Elad Gil, basecase and others.

Timestamps:

00:00 Introduction to Sarah Zeng and Her Journey

02:37 Transitioning from Investing to Startups

04:57 Joining Character AI

06:48 The Move to Braintrust

08:39 Effective Strategies for Chief of Staff Onboarding 10:03 Understanding Braintrust's Core Products

12:38 Navigating the Role of Chief of Staff

15:06 Growth in Consumer AI vs. Infrastructure AI

16:40 Braintrust's Rapid Growth and Market Position

19:20 Future of AI Evaluation and Observability

21:56 Rapid Fire

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English

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