In this photo illustration, a Twitter logo is displayed on a smartphone screen and a laptop screen.

After laying off half of Twitter's employees and issuing a stay-or- leave ultimatum to the rest, Musk sent an email to the remaining staff today seeking responses.

Please come to the 10th floor at 2 pm today to write software. Before doing so, please email a bullet point summary of what your code commands have achieved in the past six months, along with up to 10 pictures of the most important lines of code.

Business Insider published full versions of Musk's emails, as well as reports by Fortune, CNBC, and the Associated Press. In-person meetings were requested by his emails despite the fact that all office buildings were closing and employee badges were not allowed to be used.

I will attempt to speak to you via video if you email the request below. Musk wrote in a second email that only those who can't get to the headquarters can be excused. The interviews will allow me to better understand the tech stack.

For the short interviews, Musk would prefer that the programmers fly to San Francisco. I would appreciate it if you could come to SF to be with me. He wrote in an email that he would be at Twitter headquarters until midnight.

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Musk said he was not concerned about the mass departures. Musk said he was not worried because the best people were staying.

Layoffs and ultimatum drastically cut staff

Half of the employees were laid off after Musk bought the company. He told staff to work long hours in order to keep their jobs.

"If you are sure that you want to be a part of the newTwitter, please click yes on the link below," Musk wrote. Three months of separation will be given to anyone who hasn't done so by tomorrow.

According to various news reports, hundreds of employees left the company yesterday. There are conflicting reports on the number of workers who left.

According to a source at the company, between 1,000 and 1200 employees did not want to stay at the company. Less than half of the company's 4,000 employees chose to stay at the company, according to a Business Insider report.

Multiple critical systems have been left down to two, one or even zero engineers as a result of layoffs and other departures, according to a Washington Post report.

The former employee told the Post that he knew of six critical systems that no longer had engineers. There isn't a skeleton crew anymore. After it runs into something, it will stop.