The Telefonica-backed mobile wallet developer has now raised $15m in less than a year and will use the capital to build its team as it prepares to enter the US market.

Yoyo, a UK-based mobile wallet technology developer backed by telecommunications company Telefonica, has completed a $10m series A round led by Imperial Innovations, according to Business Insider.

Imperial Innovations, a technology transfer unit for UK university Imperial College London, led the round, after leading Yoyo’s $5m seed round in May 2014, while other backers included angel investors Taavet Hinrikus, Philip Riese and Michael Tobin.

The seed round also included Telefonica, early-stage investor Firestartr and assorted angel investors.

Yoyo has developed…