In a dual profile, Ben Blumenrose spotlights Phil Vander Broek—whose startup Dopt was acquired last year by Airtable—and Filip Skrzesinski—who is currently working on Subframe—in the Designer Founders newsletter.
One of the lessons Vander Broek learned was to not interview customers just to validate an idea. Interview them to get the idea first. In other words, discover the pain points:
They ran 60+ interviews in three waves. The first 20 conversations with product and growth leaders surfaced a shared pain point: driving user adoption was painfully hard, and existing tools felt bolted on. The next 20 calls helped shape a potential solution through mockups and prototypes—one engineer was so interested he volunteered for weekly co-design sessions. A final batch of 20 calls confirmed their ideal customer was engineers, not PMs.
As for Skrzesinski, he’s learning that being a startup founder isn’t about building the product—it’s about building a business:
But here’s Filip’s counterintuitive advice: “Don’t start a company because you love designing products. Do it in spite of that.”
“You won't be designing in the traditional sense—you’ll be designing the company’s DNA,” he explains. “It’s the invisible work: how you organize, how you think, how you make decisions. How it feels to work there, to use what you're making, to believe in it.”

Designer founders on pain-hunting, seeking competitive markets, and why now is the time to build
Phil Vander Broek of Dopt and Filip Skrzesinski of Subframe share hard-earned lessons on getting honest about customer signals, moving faster, and the shift from designing products to companies.