A Twitter engineer of three years said Elon Musk's "Twitter 2.0" team fired him before Thanksgiving.
He said he was on a H-1B visa and many workers on "parental leave" had also been fired.
Musk had said that he wasn't planning more layoffs, in an all-hands meeting on Monday.
A Twitter engineer on a H-1B visa was fired by Elon Musk's "Twitter 2.0 team," before Thanksgiving, he said in a LinkedIn post on Thursday.
Yiwei Zhuang, a software engineer of three years at Twitter, said his "employment is terminated immediately with no reason today by Elon's Twitter 2.0 team before Thanksgiving."
He added: "Many employees are fired today as well including those who are on parental leave."
Zhuang, who is a former Facebook intern and has experience in machine learning infrastructure, said he was "on an H1B visa and have only 60 days to start a new job." He urged his network to contact him about job opportunities.
Zhuang's post went viral receiving almost 500 reposts.
Zhuang and Twitter did not immediately respond to requests for comment about his firing, made outside of normal working hours.
Musk fired dozens of Twitter employees, mostly engineers, overnight on Wednesday, just before Thanksgiving, Insider's Kali Hays reported.
Employees fired were notified that the layoffs were due to performance reasons, and were offered one-month severance, sources told Hays.
The firings came as a surprise because Musk had said he wasn't planning any further layoffs, in an all-hands meeting on Monday at Twitter's San Francisco headquarters.
Zhuang was one of roughly 700 employees on H-1B visas at Twitter prior to Musk laying off 50% of the company. Many H-1B workers were affected and are struggling to find roles to stay in the US.
A screenshot of a now-deleted post on the anonymous workplace forum Blind showed that one H-1B worker at Twitter had been laid off in early November, and was then called back because he was "critical talent," before abruptly being fired again.
A former Twitter employee told CNN that some H-1B workers were staying at the social media giant despite worries about Musk's policies, because they're "concerned with being forced into a flooded job market where they may be unable to find a job and before being forced out of the country."