"More than 50% of them cheated," he said.
AI cheating tools have improved so much over the last year that they've become nearly undetectable, experts said. Other than Lee's Interview Coder, software engineers can also use programs such as Leetcode Wizard or ChatGPT.
Kirk said his startup is considering moving to in-person interviews, though he knows that potentially limits the talent pool.
"The problem is now I don't trust the results as much," Kirk said. "I don't know what else to do other than on-site."
Google CEO Sundar Pichai during an event at the Google for Startups Campus in Warsaw, Poland, Feb. 13, 2025.