She Worked for Twitter. Then She Tweeted at Elon Musk.

Early in November, Twitter’s roughly 7,500 employees received a terse email from a generic address: “In an effort to place Twitter on a healthy path, we will go through the difficult process of reducing our global work force.” The note was signed “Twitter.” On Nov. 3, some people at the company received emails indicating they would be laid off the next day.

That night, Ms. Solomon, her husband and a few colleagues headed to Dots Cafe Portland, a lounge on Clinton Street. Phones were on the table, face up, she said. As the work friends talked, they tapped away at their phones, taking part in chats on the Signal app with colleagues in London, Seattle and San Francisco. Messages like “I got hit” were flying across screens, Ms. Solomon recalled. “You were seeing your co-workers drop like flies,” she said.

By the next afternoon her team of about 10 engineers was reduced to four. Ms. Solomon and her husband had survived the round of layoffs. The next week, she recalled, she awaited further direction from Mr. Musk or the new executive team. Nothing came, she said, except for an email alerting employees that remote work would no longer be permitted, with few exceptions.

Many employees learned of Mr. Musk’s priorities by watching his Twitter feed, where he posted frequently about company business to his more than 100 million followers. On Nov. 5, he complained about the platform’s search function: “Search within Twitter reminds me of Infoseek in ’98! That will also get a lot better pronto,” he wrote. That same day, he tweeted: “Twitter will soon add ability to attach long-form text to tweets, ending absurdity of notepad screenshots.”

That was more than Ms. Solomon and many of her colleagues had heard internally. “Radio silence,” she said. She began to vent her frustration on Twitter.

One of her first tweets in this vein came on Nov. 6, shortly after Mr. Musk announced a new rule for Twitter users in a tweet: “Any name change at all will cause temporary loss of verified checkmark,” he wrote. He had posted that message after many people on Twitter had changed their names to variations on Mr. Musk’s name, most of them mocking.