Gregor Žunič

Gregor Žunič is co-founder and chief technology officer of Browser Use, an open-source tool that turns the buttons and fields of a web page into a form AI agents can read and act on. He started it with Magnus Müller, and the two now run the company from San Francisco, California.

Physics in Ljubljana

Žunič grew up in Slovenia and earned a bachelor's degree in physics at the Faculty of Mathematics and Physics of the University of Ljubljana. He still speaks highly of it. "Physics and mathematics are truly at a top level, even compared with the best foreign institutions," he told Forbes Slovenija in 2025 (translated from Slovenian). He then moved to Zurich, Switzerland, for a master's degree in data science at ETH Zurich. His Y Combinator profile sums him up in one line: "I love solving hard problems."

Two Startups Before Browser Use

Before Browser Use he co-founded the startups Getspexia and Real Fake Photos, according to Mladi podjetnik. Real Fake Photos, which uses AI to turn an ordinary selfie into a professional portrait, came out of ETH's Student Project House program, and Forbes Slovenija counted 12 past projects on his website where he was a co-founder, programmer or engineer. He left both startups because, while they were growing, neither was the breakthrough he wanted. "I'm not entirely sure what the future holds, but I have never been more motivated to solve hard challenges and create something truly important," he wrote on LinkedIn at the time (translated from Slovenian).

Four Days to a Hacker News Hit

He met Müller at Student Project House, where both were master's students, and the two became convinced that web agents would be the big thing of 2025. "What started as casual brainstorming over a few lunches turned into a challenge: Let's build something small, throw it on Hacker News, and see what happens," Žunič told TechCrunch. "We put together an MVP in four days," he said, and the launch reached number one. Browser Use was a side project for both founders until Y Combinator accepted it into its Winter 2025 batch.

Selling Shovels to Agent Builders

In March 2025 the Chinese agent Manus went viral, and Browser Use turned out to be one of the tools powering it. Daily downloads grew from about 5,000 to 28,000 in a week. Žunič said he and Müller were trying to "sell a shovel" to developers chasing the web agent gold rush. "We wanted to create a foundation layer that everyone will build browser agents on," he said. "In our minds, there will be more agents on the web than humans by the end of the year." Later that month Browser Use announced a $17 million seed round led by Felicis, TechCrunch reported.

Žunič told Forbes Slovenija that the team works in person in San Francisco for now, but that a larger engineering team might look to Europe. "San Francisco is great for getting started, there are connections, investors, energy," he said (translated). "Slovenia, Switzerland, depending on needs and opportunities."