A Chrome extension that finds hidden 3% mortgages on Zillow.
Assumable loans are invisible on every major listing portal. VHS flags them while you browse Zillow, Redfin, Realtor.com and Compass, and shows the rate and what you'd save, across all 50 states. Owned end to end, live on the Chrome Web Store.
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Assumable mortgages, FHA and VA loans a buyer can take over at the seller's original rate, look identical to everything else on the market. VHS surfaces them in place, with the monthly and lifetime interest savings against today's rates.
As the extension scaled to more traffic and more portals, calling a preview endpoint for every listing became a bottleneck, and fragile, since a portal changing its page could break it outright. I rebuilt it to read each portal's own listing data as it loaded: faster, and resilient to redesigns that used to take it down overnight. From there I took it national, solved the throughput and race-condition problems of checking thousands of listings at once without hammering our backend, and built the internal dashboard we used to see how people actually used it.
TypeScript · React · Vite · Chrome Extensions (MV3) · Node