Jairaj Sethi

Founder

Co-founder and CTO of Substack. Born and raised in Japan. University of Waterloo graduate in Mathematics. Previously served as Head of Platform and Principal Developer at Kik Interactive for nearly six years before co-founding Substack.

Overview

Companies
1
Roles
Founder

Companies

1 company
Substack $82M
Private Founder

Substack is a publishing platform that enables writers, journalists, and creators to publish subscription newsletters, podcasts, and other media directly to their audiences. The platform handles payments, distribution, and website hosting, allowing creators to monetize their work through paid subscriptions while retaining ownership of their content and subscriber lists.

Founder data is compiled from company records, public announcements, and verified sources. Roles reflect current or most recent known positions.