George Hotz, known as the first person to unlock an iPhone and jailbreak the PS3, both under his hacker alias “geohot”, has resigned from his Twitter internship, he announced on Twitter Tuesday night.

“Appreciate the opportunity, but didn’t think I could make any real impact there,” He wrote. He also said it was “sad” to see his GitHub “wither.”

Hotz offered to join Twitter on Nov. 16 after expressing support for CEO Elon Musk’s statement that the company should be “extremely hardcore.” “This is the attitude that builds incredible things,” said Hotz, who resigned as CEO of self-driving startup Comma AI in October. said on Twitter. “Let all those who do not desire greatness depart.” In response to a tweet mocking himHotz said he would “put my money where my mouth is” with a 12-week internship at Twitter in San Francisco. Musk replied “let’s talk.”

Two days later, on November 18, Hotz said he did officially working for Twitter. Three days later, Hotz said that Musk had instructed him to do two things, and indeed he had done so 12 weeks to finish them: Fix Twitter search and fix the popup you may see when scrolling through Twitter while not signed in.

If we start Hotz’s work clock on Nov. 18, that means he was on Twitter for about five and a half weeks of his proposed 12-week period. I don’t know if Hotz fixed the search, but I noticed that you can now close the login popup and continue browsing Twitter.