Sawyer has been appointed managing director of the UK and Europe, responsible for shaping Gemini's overall strategy in the region, developing products and hiring out a team from his base in London.

Sawyer left Starling in the summer after four years as COO of the app-only bank he co-founded. Before Starling he founded management consultancy Bluerock Consulting.

Tyler Winklevoss, CEO, Gemini. "Gemini needs to be here and Julian's deep knowledge and fintech expertise in these regions make him well-suited to lead Gemini's expansion into this pioneering area of the world."