Jonathan
Castillo

Helps Airbnb hosts track listing changes and see what actually worked

The problem: Airbnb gives hosts performance metrics but never connects them to specific listing changes. A host updates their title, sees bookings go up a week later, and has no idea if it was the title, a demand spike, or a pricing change.

Autonomous growth engine that discovers, drafts, publishes, and measures across SEO, Reddit, and BiggerPockets

The problem: Building a product is one thing. Getting it in front of the right people is another.

Community-driven fantasy football polls with accuracy leaderboards, web + iOS

The problem: Every week, millions of fantasy football players make lineup decisions based on unstructured advice scattered across Reddit threads, Discord servers, and group chats. There's no way to compare opinions, no accountability for bad advice, and no signal for whose take is actually worth listening to..

Scrapes 13+ venues, writes a weekly dog-friendly events newsletter for Tampa Bay

The problem: Dog-friendly event info in Tampa Bay is scattered across 13+ venue websites, none of which talk to each other and all of which render event data differently. My fiancée publishes a newsletter curating these events, and the manual process of visiting every site, deduplicating, and rewriting descriptions was taking hours every week..

Full booking platform for a boutique dog boarding business, built in 5 days

The problem: The tools available to solo pet-care operators are either giant marketplaces like Rover or nothing at all. My fiancée Virginia runs a boutique dog boarding business, two dogs at a time, and there was no simple way to handle bookings, track each dog's care needs, manage capacity, or present a professional brand that matched the quality of her service..