A Letter to the Operator

I grew up pressure washing in upstate New York with my dad. Six summers in the truck. I spent two to three hours of my day driving between jobs. I’d be up on a ladder washing a house and miss calls because I couldn’t hear my phone ringing.

I spent a summer inside TR Miller, a $40M HVAC, plumbing & electrical shop in Illinois that became Probook’s first customer. I cycled between call center, dispatch, and inside sales, taking calls, setting the board, following up on unsold estimates. I felt how raw workflows were, even at one of the best-run shops in the country.

Most AI vendors flocked to home services because it looked attractive on a spreadsheet. We came to it because we grew up in it. Ben grew up helping his dad plumb in San Francisco. Lewis is the most technically gifted person I have ever worked with. We started building.

In the early days, the three of us traveled the country and onboarded every customer in person. We sat on the floor, configured the product alongside their front-line teams, and stayed until it worked. I’ve slept on customers’ couches. I’ve been to their weddings and their bachelor parties. We are peers to our customers, not their vendors. We still onboard every customer that way today.

We understand this industry in a way that Silicon Valley never will. We stood in for dispatchers when a bad deployment broke our optimization engine at 6 AM on a Monday. We handled hundreds of live calls when our AI CSR went down. We wrote change management plans for shops where four previous AI implementations failed.

We’re well past those moments now, and I’m grateful for the pain some of our early adopters endured. No amount of money can cheat those years of learning.

If you run a home services business, the last three years have happened to you. You watched a wave of AI vendors show up at every conference, all making the same promise. You bought some of it. You piloted more of it. You ended up with five new tools, three new vendors, and a bill that grew faster than your revenue. Customer experience didn’t improve. Margins didn’t get better. Manual QA just kept piling up.

The problem isn’t AI. It’s that AI sat on top of a fragmented system. That’s what got us here.

The next decade will not be won by the best voice agent or the best outbound tool. It will be won by the platform that runs the customer experience end to end, where AI does the bulk of the work and your team manages the exceptions. Not five tools and three vendors. One platform that runs it all.

That platform is what we’re building.

Today we announced $40M from Andreessen Horowitz and Sequoia Capital to keep building it. Probook is the AI Operating System for home services, built around dispatch.

These firms rarely co-sign the same company. When they do, it’s because they see a category winner. We’re grateful to David Haber, General Partner at Andreessen Horowitz, and Konstantine Buhler, Partner at Sequoia Capital, for their conviction.

Probook now serves hundreds of locations nationwide, from independently owned shops to private equity-backed platforms. Summers Plumbing, Heating & Cooling, with 14 locations and 260 technicians across the Midwest, booked 2,873 jobs in their first month on Probook with zero human intervention. Kansas-based Anthony Plumbing, Heating, Cooling & Electric ran 10% more revenue per job on a 40% leaner team in eight months on Probook. Del-Air more than doubled productivity from 10 to 22 techs per dispatcher.

Operators run on Probook to add points to their EBITDA and operate their customer experience as one connected system.

Lewis got a perfect score on the AMC 12 and finished Berkeley EECS in two years with a 4.0. Our engineering team is more talent-dense than early Ramp, stacked with ICPC World Finalists and IMO Gold Medalists. Our GTM and CS teams came up at Procore, Zocdoc, and other vertical leaders.

If you want to do the best work of your career on a category-defining product, join us.

The trades built this country.
We are building the platform that helps them run.