castle
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Johan Brissmyr
Johan Brissmyr is the CEO and co-founder of Castle, a security company that helps online businesses detect fraud, bots, and account takeover in real time. A computer scientist from Lund University, he started building web products in Malmo, Sweden before moving to Silicon Valley through Y Combinator and relocating the company to New York. Castle grew out of a password-storage side project that revealed a bigger opportunity in behavioral risk scoring, and today combines device fingerprinting, behavioral signals, and analytics into APIs used by companies of many sizes.
Madeline Hung
Madeline Hung is the co-founder and CEO of Castle, a Hudson, New York fintech building payments infrastructure for the home - software that helps homeowners automate, consolidate, and reduce the cost of their biggest asset. She arrived at the idea the hard way, converting a derelict Hudson Valley photography studio into a livable house during the pandemic and discovering that tracking home spend felt like writing paper checks into a black hole. Before Castle she co-founded The Good Country with nation-branding strategist Simon Anholt and worked across human-rights research and citizen-engagement ventures, a path that runs from Oxfam and Health Leads to a seed-funded home finance app.