Jan Hammer is a partner at Index Ventures, the venture capital firm with offices in London and San Francisco. He joined Index in 2011 and has focused primarily on growth-stage investments in fintech and consumer technology across Europe and the United States. His portfolio work has included backing companies such as Adyen, Robinhood, and Revolut, among others. Hammer studied in the Czech Republic and the United States before moving into venture capital. He is widely regarded as one of the more active European investors in financial technology, with a particular interest in payments infrastructure and digital banking.