When Stripe, a payments start-up valued at $74 billion, laid off more than 1,000 employees this month, its co-founders blamed themselves. “We overhired for the world we’re in,” they wrote. “We were much too optimistic.”

After Elon Musk, Twitter’s new owner, slashed the company’s staffing in half last week, Jack Dorsey, a founder and former chief executive of the social media service, claimed responsibility. “I grew the company size too quickly,” he wrote on Twitter.

And on Wednesday, when Meta, the parent company of Facebook and Instagram, shed 11,000 people, or about 13 percent of its work force, Mark Zuckerberg, the chief executive, blamed overzealous expansion. “I made the decision to significantly increase our investments,” he wrote in a letter to employees. “Unfortunately, this did not play out the way I expected.”

The chorus of conceding by tech executives that they hired too many people is ricocheting across Silicon Valley as the industry rushes to make cuts, blaming a worsening economy.

But at least part of the surge in layoffs was self-inflicted. When the companies enjoyed soaring profits and a belief that the pandemic-fueled boom times would keep going, they aggressively expanded by hoarding the most fought-over and expensive resource in the software business: talent.

Silicon Valley tech companies have long seen hiring as more than just filling openings. The industry’s fierce talent wars showed that companies like Google and Meta were gaining the best and brightest. Ballooning staffs and a long reign atop lists of the most-desired jobs for college graduates were emblems of growth, deep pockets and prestige. And to employees, the work became something larger — it was an identity.

This mentality became ingrained at the largest tech companies, which offer numerous perks on lavish corporate campuses that rival universities. It was echoed by smaller start-ups, which dangle a chance at life-changing wealth in the form of stock options.

Now these practices are giving the tech industry indigestion.

“When times are flush, you get excesses, and excesses lead to overhiring and optimism,” said Josh Wolfe, an investor at Lux Capital. “For the past 10 years, the abundance of cash led to an abundance of hiring.”

More than 100,000 tech workers have lost their jobs this year, according to Layoffs.fyi, a site that tracks layoffs. The cuts range from well-known publicly traded companies like Meta, Salesforce, Booking.com and Lyft to highly valued private start-ups such as the Gopuff delivery service and the Chime and Brex financial platforms.Many of the job losses have taken place in tech’s most experimental areas. Astra, a rocket company, cut 16 percent of its staff this week after tripling its head count last year. In the cryptocurrency industry, which has suffered a meltdown this year, high-value companies including Crypto.com, Blockchain.com, OpenSea and Dapper Labs have cut hundreds of workers in recent months.

Tech leaders were too slow to react to signs of an economic slowdown that emerged this spring, after many of the companies had already been on hiring sprees for several years, tech analysts said.

Meta, whose valuation soared past $1 trillion, doubled its staff to 87,314 people over the past three years. Robinhood, the stock trading app, expanded its work force nearly sixfold in 2020 and 2021.

“They’ve charged ahead with these plans that are no longer based on reality,” said Caitlyn Metteer, director of recruiting at Lever, a provider of recruiting software.

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