Another big wave of job cuts are coming to Meta as it continues to seek efficiency in a challenging economic environment.

The parent company of Facebook, Instagram and WhatApp expects to lay off 10,000 more people, in addition to closing 5,000 currently open roles. That’s on top of 11,000 layoffs the company announced in November.

Restructurings and layoffs in Meta’s tech groups will be announced in late April and business groups in late May, though timelines may be different in international markets and, in some cases, changes may not be completed until the end of the year.

Reports of the pending cuts began circulating late on Monday and were confirmed in a letter to staff from CEO Mark Zuckerberg on Tuesday morning.

“After restructuring, we plan to lift hiring and transfer freezes in each group,” Zuckerberg said in the statement. “Other relevant efficiency timelines include targeting this summer to complete our analysis from our hybrid work year of learning so we can further refine our distributed work model. We also aim to have a steady stream of developer productivity enhancements and process improvements throughout the year.”

Much of Zuckerberg’s nearly 2200 word letter to staff, which was also shared publicly, was devoted to justifying the company’s “year of efficiency” and providing an update on the work done so far. First mentioned alongside Meta’s underwhelming Q4 financial results, the company plans to spend 2023 restructuring and cutting costs to build a flatter, leaner organization that is better positioned to deliver on the company’s long-term goals.

Among the changes Meta has made is eliminating layers of management for a “flatter” organization; eliminating smaller, low-priority projects; “rebalance” product teams towards engineering and technology; and investing in tools and working models that provide the most efficiency.

Meta has struggled to deliver on earnings over the last year, with ad revenue first hit by Apple’s iOS 14 update impacting that company’s targeting capabilities, which was followed by advertisers pulling back on spending amid an uncertain macroeconomic environment.

“At this point, I think we should prepare ourselves for the possibility that this new economic reality will continue for many years,” Zuckerberg said in his update. “Higher interest rates lead to the economy running leaner, more geopolitical instability leads to more volatility, and increased regulation leads to slower growth and increased costs of innovation. Given this outlook, we’ll need to operate more efficiently than our previous headcount reduction to ensure success.” He added that, despite this, the company would be able to continue with its long-term vision due to “a financial plan that enables us to invest heavily in the future while also delivering sustainable results, as long as we run every team more efficiently.”