matt shumer
x: @mattshumer_
i see around corners, build for what's next, and use my audience to shift startup trajectories.
about
I'm Matt Shumer — founder & CEO at OthersideAI (HyperWrite). I build and invest in AI products, ship fast, and share what I learn with a large audience. I wrote the essay Something Big Is Happening.
Lately: pushing GPT‑5 to its limits, collaborating on AutoRL with OpenPipe (acquired by CoreWeave), and helping early teams go from zero → launch.
I also have a slight obsession with sushi and food in general. Most of my free time is spent cooking and eating.
ceo @ othersideai
hyperwrite // ai writing assistant
+ undisclosed products
founded 2020
backed by Madrona, Active Capital, Cortical Ventures, Hustle Fund, Chapter One, and others
investing
I invest as an angel and through Shumer Capital — backing best-in-class AI infra, dev tools, and agent-native products at pre-seed and seed.
Logos provided by Logo.dev.
open source
public prompt library
free resource for community
free resource for community
automatic prompt optimization
15k+ stars
15k+ stars
experimental RL framework — describe the model you want in a sentence; it auto‑generates data and trains the model end‑to‑end for you
more tools @ github.com/mshumer