Jan Hammer focuses on startups that rebuild the core infrastructure of finance and data rather than just front-end experiences, backing companies like Adyen, Collibra, Wise and Robinhood that operate at the deepest layers of the digital economy's transaction and data flows. He champions full-stack models in fintech, using Adyen as an example of one company rebuilding merchant acquiring, processing and payment acceptance across regions rather than doing just one slice, and has a reputation for backing non-obvious companies at the formative stage with founders like Robinhood's publicly noting that 75 investors shut doors in their face but Jan believed in them from the very start. Jan Hammer focuses on startups that rebuild the core infrastructure of finance and data rather than just front-end experiences, backing companies like Adyen, Collibra, Wise and Robinhood that operate at the deepest layers of the digital economy's transaction and data flows. He champions full-stack models in fintech, using Adyen as an example of one company rebuilding merchant acquiring, processing and payment acceptance across regions rather than doing just one slice, and has a reputation for backing non-obvious companies at the formative stage with founders like Robinhood's publicly noting that 75 investors shut doors in their face but Jan believed in them from the very start.