As co-founder and CTO of Proximitty, Zixuan leads the development of an AI-native platform transforming commercial loan servicing for banks and fintechs, as a Y Combinator (W26) founder backed by Uphonest Capital, Cohen Circle, Twenty Two Ventures, Seraph Ventures, and Singularity Capital. Previously, he led security infrastructure at Bloomberg LP securing 300,000+ terminals and served as Head of Engineering at ACI.dev, building the world's first unified MCP server (4,000 GitHub stars in one month).