Elon Musk issued an urgent plea to Twitter employees in a series of emails Friday morning. “Anyone who actually writes software, please report to the 10th floor at 2 p.m. today,” he wrote in a two-paragraph message that The New York Times obtained. “Thank you, Elon.”

Musk sent another email about 30 minutes later, saying he wanted to learn about Twitter’s “tech stack,” a term used to describe a company’s software and related systems. In a subsequent email, he invited some people to fly to Twitter’s headquarters in San Francisco to meet in person. According to three people close to the company, at least 1,200 full-time employees resigned on Thursday, according to internal estimates. Twitter had 7,500 full-time employees at the end of October, which has since been reduced to around 3,700 following mass layoffs earlier this month.

Elon Musk issued an urgent plea to Twitter employees in a series of emails Friday morning. “Anyone who actually writes software, please report to the 10th floor at 2 p.m. today,” he wrote in a two-paragraph message that The New York Times obtained. “Thank you, Elon.”

Musk sent another email about 30 minutes later, saying he wanted to learn about Twitter’s “tech stack,” a term used to describe a company’s software and related systems. In a subsequent email, he invited some people to fly to Twitter’s headquarters in San Francisco to meet in person. According to three people close to the company, at least 1,200 full-time employees resigned on Thursday, according to internal estimates. Twitter had 7,500 full-time employees at the end of October, which has since been reduced to around 3,700 following mass layoffs earlier this month.