Jairaj Sethi

Jairaj Sethi is the Co-founder and Chief Technology Officer (CTO) at Substack, a platform that allows writers to publish and monetize their newsletters. He has been in this role since March 2018, contributing significantly to the company's technological development and strategic direction.123

Background and Education

Sethi earned his Bachelor's degree in Mathematics from the University of Waterloo in Canada, graduating in 2011. His early career included a position as the Head of Platform and Principal Developer at Kik Interactive, Inc., where he worked for nearly six years before co-founding Substack.13

Current Roles

In addition to his work at Substack, Sethi is also an Advisor at Untether Labs since January 2024 and has been involved with Homecoming as an advisor since February 2021.1 His experience in the tech industry is complemented by his participation in Y Combinator, a well-known startup accelerator, during its Winter 2018 batch.12

Personal Insights

Sethi is described as somewhat elusive, often not in the public eye, which adds to his mystique as a co-founder of Substack. He has shared personal anecdotes and insights into his life and interests, including hiking tips for Iceland, showcasing a more personal side beyond his professional achievements.45

Overall, Jairaj Sethi's contributions to Substack and his previous experiences highlight his expertise in technology and entrepreneurship within the digital publishing landscape.