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Chestnut

The first AI mortgage lender

Y CombinatorSpring 2025ActiveFintechCredit and LendingFintechReal EstateConsumerAI

What they do

Problem

Mortgage origination is slow and labor-intensive, leading to higher costs and interest rates for borrowers.

Solution

Chestnut is an AI-powered mortgage lender that uses AI agents to automate nearly all mortgage processing work and deliver lower interest rates.

Who it's for

Homebuyers and homeowners seeking purchases, refinances, or cash-out mortgages.

Founders

Spencer Brown
Founder

Repeat founder building the first AI mortgage lender. My last startup built a system of record for mortgage lending that powered 2% of US mortgages annually. During that time, I saw firsthand how inefficient traditional lenders are – and realized I should compete with them directly. I started coding at age 12, founded my first company at 16, and was an early engineer at six other seed- and A-stage startups.

Open roles 1

Software Engineer
San Francisco, CA · Full-time · $100K - $200K · 0.50% - 3.00%
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