The head of Instagram, Adam Mosseri, is relocating to London. The move is due to “the global nature” of Mosseri’s role, a spokesperson from Instagram’s parent company, Meta, told Insider.
London is the company’s largest engineering hub outside the US and has a dedicated Instagram product team, the spokesperson added.  
Mosseri will reportedly be seeking to hire more staff in the UK offices, according to The Guardian. Any staff hired in the UK capital can expect to earn less than their counterparts in San Francisco, however.
The reasons for this pay disparity include a higher cost of living, paired with an inflated level of demand for tech specialists in the US city.
Across Meta, San Francisco-based workers make more money than employees in London.
Meta’s average product manager in London earns $146,605 base salary a year, according to data from the employee review site Glassdoor. Product designers at the company make an average salary of $115,150 a year, according to the same data.
In San Francisco, three product managers hired by Meta in the last year were paid between $180,000 to $210,000. While a product designer hired in 2022 was paid a base salary of $185,792, according to publically disclosed foreign labor data.
This salary disparity is not unusual, said Chris Abbass, who heads up Talentful, a recruitment service for tech companies that operates in San Francisco and London. 
“Inflation and demand for tech specialists are pushing up salaries across all geographies, but there is still a huge difference between London and San Francisco,” he said.
Despite Meta being one of the highest-paying tech companies around the world, hiring in London tends to be cheaper than doing so at the company’s headquarters in San Francisco.
He added: “The sheer volume of high-growth tech companies in San Francisco creates massive demand for highly skilled workers, which pushes up salaries faster than in other geographies.”
The cost of living is also a factor in the pay disparity. San Francisco is ranked the 14th most expensive city in the world by Numbeo, a site that provides a crowdsourced summary of the cost of living across major cities. London is listed as the 40th most expensive city on its cost of living index.
Even locals claim you need $1.7 million to be “financially comfortable” in San Francisco and $5.1 million to be considered wealthy by Bay Area standards, according to an Insider report, which cited the data from a Charles Schwab survey earlier this year.
“Californians’ costs of living are often higher — they can expect to drive more, pay more for food and rent, pay private medical bills, and so on, which puts more pressure on businesses to raise salaries,” Abbass said. “The infrastructure and the social support are also a lot weaker in America.”
The average monthly cost of living for one person in San Francisco is $1,351.37 excluding rent costs, according to Numbeo. Meanwhile, a single person in London can get by on an average of $1,100 per month before rent, according to data
London residents also benefit from a stronger social support system than the US, with free healthcare and better transport infrastructure than San Francisco. 
But even with those socio-economic differences accounted for, Abbass said there is still a significant gap between London and San Francisco salaries for skilled tech roles, mainly due to the sheer number of high-growth tech companies in the US city.
London may be home to an exciting and fast-growing tech scene, particularly for fintech companies, but San Francisco has historically been the leading hub for major tech companies such as Meta. Salaries for skilled tech workers in the city have been inflated by this demand for years.
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