Monzo founder Tom Blomfield joins Anthropic’s compute team

Tom Blomfield built two of Britain’s best-known fintech companies. Now the Monzo founder is joining Anthropic, and his job is to help crack the AI industry’s hardest problem: compute.

One of the biggest names in UK tech is heading to one of the most valuable companies in AI. Tom Blomfield co-founded the digital bank Monzo and the payments firm GoCardless. On Monday he said he is taking a leave of absence from the startup accelerator Y Combinator to join Anthropic.

He announced the move on X. He wrote that he would be working on the compute team alongside Tom Brown, an Anthropic co-founder and its chief compute officer. Blomfield joins as a member of technical staff, the title Anthropic uses for senior hires, as Business Insider first reported.

Why compute

On the surface it is an odd fit. Blomfield’s career is in consumer products and fintech, not data centres. But at Anthropic, compute is no longer just an engineering task. It has become one of the industry’s biggest commercial and operational challenges. Founder-level judgement there can matter as much as technical depth.

Blomfield framed the job as mission-critical. “Powerful AI has the potential to improve the life of every human on earth”, he wrote, “and, as we enter the early stages of recursive self-improvement, availability of compute becomes one of the most important issues to solve.”

The scale of Anthropic’s build-out shows why. The company has committed to deploy up to a million Google TPUs. More than a gigawatt of that capacity is due online this year. A separate deal with Google and Broadcom adds roughly 3.5 gigawatts of next-generation chips from 2027. In May it also signed a cloud agreement with Elon Musk’s xAI for more than 220,000 Nvidia GPUs, according to Tech Funding News.

A $9bn track record

Blomfield is one of the rare British founders with two hits to his name. He co-founded GoCardless in 2011, then Monzo in 2015, and ran the bank as chief executive until 2020. Between them, the two companies reached a combined peak valuation of more than $9bn.

Both are now nearing milestones. Monzo has passed 10 million customers and is preparing a London listing that could value it between £6bn and £7bn. GoCardless has agreed to be bought by the Dutch payments group Mollie in a deal worth about €1.05bn, still awaiting regulatory approval.

He left Monzo in early 2021. He told TechCrunch he had stopped enjoying the job once the bank was no longer a “scrappy startup”. He then moved into investing, joining Y Combinator and becoming a full partner in 2023, where he mentored founders across four batches.

Anthropic’s celebrity hiring streak

The move fits a pattern. Anthropic has spent 2026 recruiting marquee names, a sign of how fierce the AI talent war has become. Andrej Karpathy, an OpenAI co-founder, joined in May to lead pre-training research. In June the company poached the Nobel laureate John Jumper from Google DeepMind. Eric Boyd left Microsoft Azure to run its infrastructure team.

The churn runs both ways. The same talent war has also pulled senior people out of OpenAI’s top ranks.

The prize Blomfield is joining is large. Anthropic is one of the most valuable companies in AI. It has confidentially filed to go public, and could list as soon as this autumn. Its UK fintech world has long exported talent to Silicon Valley. This time the export is a founder, headed not to build another bank, but the compute layer the next wave of AI will run on.