
The Product Podcast Google VP of Product on The Future of Search and AI Mode | Robby Stein | E287
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Mar 11, 2026 Robby Stein, VP of Product at Google Search who led consumer products at Instagram, discusses AI Mode and the AI-driven transformation of Search. He talks about building zero-to-one products inside huge companies. He explains agentic Search that executes multi-step tasks, how to measure early product traction, and lessons from Instagram failures that shaped product strategy.
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Validate With 500 Trusted Testers First
- Start new products with a very small, trusted group to validate demand before scaling.
- Robby launched AI mode to ~500 internal testers, then labs, watching retention curves before broader rollout.
J Curve Retention Signals Product Market Fit
- Flat or J-curve retention in early cohorts is the clearest signal of product-market fit.
- Track day0 cohorts through day30/60/90 to see flattening or upward trends that indicate intensifying reuse.
Search Becomes Real Time Knowledge Engine
- Search can become deeply knowledgeable by combining web breadth with real‑time signals and model reasoning.
- Robby expects AI to aggregate reviews, live prices, creator views and deal history in one model-driven view.

