Meta chief executive Mark Zuckerberg said the cuts would be "tough", and formed part of a "year of efficiency".
"We will let recruiting team members know tomorrow whether they're impacted," he wrote in a memo to employees on Tuesday.
"We expect to announce restructurings and layoffs in our tech groups in late April 2023, and then our business groups in late May 2023.
"Our timelines for international teams will also look different, and local leaders will follow up with more details."
Mr Zuckerberg said there would be no new hires until the restructuring was complete, and said he aimed to make the company "flatter" by "removing multiple layers of management".
He also dedicated a section of the correspondence to hybrid work, and said software engineers who joined Meta in-person performed better than those who joined remotely - indicating that this would change as part of the company's "year of efficiency".
"Engineers earlier in their career perform better on average when they work in-person with teammates at least three days a week," he added.