Hey, I'm
Sean Matthews
Founder @ Left Hook • OSS Maintainer • Formerly Sr. PM of APIs @ Klaviyo
I study integration platforms and build with them. I'm Founder & Strategic Advisor at Left Hook, lead maintainer of the Frigg Framework, and most recently was Sr. PM of APIs at Klaviyo. Always tinkering.
Résumé
One resume, five lenses. Pick how you want to read it and the highlights reshuffle to match.
What I'm building
A few of the things keeping me busy.
Klaviyo
Helped open the API platform behind 167K+ brands to AI agents
Sr. PM of APIs · 2026
Left Hook
Builds and manages integrations for software companies and the businesses they serve
Founder & Strategic Advisor
Frigg Framework
Open source framework for building integrations fast
Lead Maintainer
Sean Stack
Full-stack Next.js template with my preferred dev workflow
Creator
Freedom Cafe
Community platform fostering connection and engagement
Founder