Serafim Korablev is Co-Founder and CEO of 21st.dev (YC W26), the largest React component registry for AI applications, providing UI building blocks and infrastructure for the agentic internet.

Serafim studied at Moscow State Academy of Physical Culture and became one of the first full-time vibe-coders starting in October 2023, blending deep design sensibility with product engineering.

A serial builder at heart, Serafim previously co-founded Via, a cross-chain crypto routing protocol with $1.5B in GTV backed by Naval and others, as well as the first Telegram-native memecoin launchpad, which achieved a multi-million dollar exit.

At 21st.dev, Serafim led the team to build and launch 9 products in the first 10 months, attracting over 1.4M developers and earning backing from Y Combinator, AAL VC, Hustle Fund, and S16VC.

21st.dev has amassed 200K monthly active users, 15,000+ GitHub stars, and serves as the go-to infrastructure layer for developers shipping AI agents and agent-powered applications at scale.