Silicon Valley says move fast and break things. Shensi Ding built Merge by doing the opposite: nine months of building with zero users, obsessing over margins while everyone else chased growth at any cost. Today the fastest-moving AI companies in the world, including Mistral and Perplexity, run on the infrastructure she refused to rush.

Brennan sits down with the co-founder and CEO of Merge ($75M from Accel, NEA, and Addition) to talk about the unfashionable choices behind the connective layer of production AI. Shensi gets candid about the post-Series B hiring spree that felt like "an organ getting rejected," why she studies competitors like Sherlock Holmes, the stigma around Chinese open-source models, and the fertility numbers that made her rethink founder stress.


Highlights:

  • Why building for nine months with zero users meant launching with zero bugs
  • The over-hiring mistake, and the "fewer, better people" rule that came out of it
  • How one rogue AI agent can delete your entire Salesforce, and how to stop it
  • Chinese open-source models, and how American routers put a "surface" on top of them
  • Why model access based on citizenship is coming to your company
  • "You can't fake margins forever": her case against AI financial engineering
  • 20 eggs, one embryo: the honest math of founder stress and fertility


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Find Shensi on LinkedIn and X (@shensi) · merge.dev

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