Before Musk led a $44 billion leveraged buyout of Twitter last year, Twitter's headcount stood at about 7,500 employees.

Internal records show that Twitter has shed about 80% of its employees since Elon Musk took over and headcount is hovering around 1,300 working employees today.

With fewer than 550 full-time engineers now, one former Twitter engineer says the remaining team will be spread thin, and will likely have a hard time maintaining the service while adding new features.