Elon Musk and a bunch of his advisers have tightened their grip over Twitter, assembly with firm executives to work on layoffs, ordering up product modifications, speaking with advertisers and reviewing content material moderation insurance policies, in accordance with greater than a dozen present and former workers concerned within the efforts.

The priorities for the world’s richest man and his advisers at Twitter are twofold, 5 of the folks mentioned: They’re engaged on the best way to trim the corporate’s ranks whereas additionally exploring a slew of modifications to Twitter’s cell app.

For now, the timing and scope of layoffs stays fluid as lists of the highest and decrease performers on the firm are finalized, the folks mentioned. Mr. Musk’s advisers have additionally assigned a crew of Twitter’s engineers to work on its “verification” program, the system that doles out badges to high-profile or notable customers to substantiate their profiles’ authenticity. Twitter might cost customers $20 a month to retain their verified standing, two folks with information of the discussions mentioned.

Mr. Musk, 51, flew to New York on Sunday after spending a lot of final week at Twitter’s headquarters in San Francisco, in accordance with one individual acquainted with his actions and a Twitter account that tracks the location of his personal jet. A few of his trusted confidants stay in San Francisco, the folks mentioned, together with David Sacks, a enterprise capitalist, and Sriram Krishnan, a former Twitter product chief and associate on the funding agency Andreessen Horowitz, which invested in Mr. Musk’s buyout of Twitter.

Different advisers, lots of whom have been in a “warfare room” with Mr. Musk at Twitter’s headquarters final week, embrace Jared Birchall, the top of Mr. Musk’s household workplace, Alex Spiro, his private lawyer, and Jason Calacanis, a tech investor and podcaster, mentioned six folks with information of the matter. Mr. Musk additionally led to 50 engineers, product leaders and workers members to Twitter from his different corporations, similar to the electrical carmaker Tesla, the tunnel firm the Boring Firm and rocket maker SpaceX, mentioned 4 folks with information of the matter and inside paperwork seen by The New York Occasions.

Their actions have thrown Twitter’s 7,500 workers into upheaval, with present and former staff buying and selling personal messages and forming group chats to debate what is going on on the firm. Some are calling Mr. Musk’s advisers “Elon’s goons.” Many are fearful about whether or not they are going to nonetheless have jobs.

Mr. Musk, who has a status as an aggressive supervisor, has moved rapidly to overtake Twitter since he accomplished the $44 billion buyout of the corporate on Thursday. He instantly fired the corporate’s chief government, chief monetary officer and others. He additionally mentioned he would type a content material moderation council to determine what sorts of posts to maintain up on Twitter and what to take down, and mentioned he wouldn’t immediately reinstate customers who had been banned from the platform.

His modifications are usually not anticipated to subside anytime quickly. Mr. Musk, who loaded $13 billion of debt onto Twitter for the buyout, faces monetary stress to show its enterprise round so he pays the curiosity — about $1 billion a 12 months — on the debt. Will probably be a problem. Twitter has not turned a revenue for eight out of the final 10 years, and the broader digital promoting market has been hit by world financial fears.

Mr. Musk didn’t reply to a request for remark, whereas Twitter declined to remark. A few of Mr. Musk’s advisers have tweeted about how they’re working with the billionaire on serving to the corporate make the transition.

Mr. Musk’s work on altering Twitter’s verification program was reported earlier by The Verge.

On Monday, Jack Dorsey, a Twitter founder, disclosed in a regulatory submitting that he had rolled over his stake within the social media service into the brand new firm beneath Mr. Musk’s possession. The worth of Mr. Dorsey’s stake was roughly $1 billion primarily based on Mr. Musk’s buy worth for Twitter.

At Twitter’s headquarters final week, Mr. Musk and his advisers met with high managers, two folks concerned within the conferences mentioned. These managers have been requested to elucidate their groups and what their divisions did, the folks mentioned, together with detailing how Twitter’s algorithms kind and serve up content material, the relationships with key advertisers and the way the promoting platforms work.

Twitter managers concerned within the conversations mentioned they felt as in the event that they have been being evaluated for his or her jobs. Some slept on the workplace on Friday and Saturday nights, they mentioned.

The managers have been additionally requested for lists of their groups and the “high performers,” mentioned 4 folks concerned within the deliberations, including that this was a method for Mr. Musk and his colleagues to find out who to maintain and who to chop. Mr. Spiro and Mr. Birchall are crunching the numbers and looking out intently at layoffs, two folks mentioned.

Within the occasion of mass layoffs, Mr. Musk is required by the U.S. Employee Adjustment and Retraining Notification Act to supply advance discover to the federal government and workers. Workers haven’t obtained any notification, 4 workers mentioned. A spokeswoman for San Francisco’s Workplace of Financial and Workforce Improvement mentioned that, as of Monday, town had not obtained such a discover.

“There’s quite a lot of stress to do it as rapidly as attainable,” Brian J.M. Quinn, a professor at Boston Faculty Regulation College, mentioned of job cuts. Mr. Musk “is beneath stress nearly from the get-go to cut back prices at Twitter. Revenues are clearly down.”

At the least two Twitter workers, who have been publicly important of Mr. Musk and his takeover, have been fired in latest days, mentioned two folks on the firm.

Mr. Musk and his advisers have additionally explored speedy modifications to the app to bolster income. That features modifications to Twitter’s verification program, which was free for accredited customers. Mr. Musk now desires to cost folks $20 a month to maintain their verified standing and set a Nov. 7 deadline for the change, or folks on the verification crew would face termination, two folks with information of the efforts mentioned. Phrases of the brand new program are nonetheless in dialogue and will change throughout product growth, they added.

Some workers mentioned the change might set off tax implications for Twitter, whereas others fearful about regulatory pushback, two workers mentioned. Some verified customers who’re referred to as Very Necessary Tweeters may be on a listing led by the Workplace of International Property Management, or O.F.A.C., which is an company of the Treasury Division that manages and administers worldwide sanctions. It could be unlawful for an organization to just accept cash from sure customers on such a listing.

At the least one product shift — an alteration of Twitter’s logged-out dwelling web page that now reveals trending matters as an alternative of a login display — has already been carried out, in what three folks mentioned was a check of engineers’ capabilities.

On Sunday, Mr. Musk additionally ran a ballot on Twitter asking if he ought to “deliver again Vine,” a brief video platform that the social media firm purchased and later shut down.

Some present and former workers have created personal Slack teams exterior of Twitter to commiserate with each other, mentioned 4 people who find themselves within the teams. In a single such group, former Twitter workers try to unfold “optimistic” messages as insiders fear in regards to the destiny of their employment.

On Monday, some staff tweeted darkish jokes about refreshing their e mail inboxes as they awaited a layoffs announcement.

On Sunday evening, after a Twitter account that follows Mr. Musk’s personal airplane confirmed that it had landed at New Jersey’s Teterboro Airport, hypothesis arose amongst Twitter workers that he would seem on the firm’s New York workplace this week.

“We’re having a really productive day assembly with the advertising and marketing and promoting group right here in New York,” Mr. Calacanis, one among Mr. Musk’s advisers, tweeted on Monday. “So many nice concepts on the best way to improve pleasure on the platform!”

Lauren Hirsch contributed reporting.