John Han is Co-Founder at Blockit AI, an AI-powered calendar scheduling platform that uses autonomous agents to negotiate meetings. Blockit raised $5M in seed funding led by Sequoia Capital in January 2026.

John spent over 10 years building calendar products at Google Calendar, Timeful, and Clockwise, bringing deep product expertise to intelligent scheduling.

John co-founded Blockit with Kais Khimji, a former Sequoia Capital partner who originally conceived the idea as a Harvard student a decade ago. Their AI agents negotiate meeting times by understanding context, priority, and user preferences.

Blockit has attracted over 200 companies including Together.ai, Brex, Rogo, and venture firms a16z, Accel, and Index. The platform has sent over 2,000 scheduling emails, saving users 139 hours and eliminating 638 days of reply lag.

Blockit differentiates from competitors like Calendly by using AI agents that dynamically negotiate rather than just sharing availability links. Sequoia's Pat Grady stated Blockit has the potential to become a $1 billion-plus revenue business.