Diane Yu on Founder Uncovered: Why a Mortgage System Can't Be a Thin Wrapper

On a Saturday night, a Fairway loan officer at dinner with his family sent a borrower a SOLO link. Twenty minutes later, the borrower held a pre-approval backed by Fannie Mae and Freddie Mac approvals and went house shopping the next morning. Under incumbent systems, he would have left the table to open a laptop. In this hour-long conversation on Founder Uncovered, tidalwave Co-founder and CEO Diane Yu uses that story to show what changes for borrowers when a mortgage system is built AI native.

To Diane, this is not merely an engineering issue. In this conversation she shares her own experiences from thirty years ago, applying for her first mortgage in her second language, and the many unpleasant surprises that included. Years later, after selling her first company, she applied for another mortgage and found that nothing in the process had changed. In her own words, when she sees a problem she can’t leave it alone.

She also takes on the question investors ask most: why can't OpenAI or Anthropic just do this? Short answer, because Tidalwave has been building its mortgage contextualizer since 2023. It validates the critical data points on every file and declines questions it shouldn't answer. A general model will give you an answer either way, and it may not be correct. Because the contextualizer grows alongside AI capability, every new model release makes it stronger instead of obsolete. And a general model can't download direct integrations with Fannie Mae and Freddie Mac, compliance approvals from large lenders, or production data from real loan officer workflows.

The proof is public. In a Columbia University benchmark, SOLO scored 95% on compliance questions against 42% for a general model. We then helped build MortarBench, the open-source follow-up with Columbia, and even GPT-5.5 got nearly one in four answers wrong. As Diane puts it, you cannot use a thin wrapper to do this work.

Underneath it all is a simple engineering discipline: build the foundation first, and add the doors and windows last. A customer once said the system truly worked but the colors were wrong, so the team fixed the colors. In a regulated industry, reliability first and polish second is the right order.

Watch the full conversation below.