matt shumer
x: @mattshumer_
I build AI products, invest in the infrastructure behind them, and write about what I'm seeing—usually before it's obvious.
building
Founder & CEO at OthersideAI (HyperWrite). Investing via Shumer Capital—backing AI infra, dev tools, and agent-native products at pre-seed and seed.
Lately: pushing GPT‑5 to its limits, collaborating on AutoRL with OpenPipe (acquired by CoreWeave), and helping early teams go from zero → launch.
investing
Logos provided by Logo.dev.
open source
shumerprompt
public prompt library — free resource for the community
gpt-prompt-engineer
automatic prompt optimization — 15k+ stars
AutoRL
RL framework — describe the model you want, it trains end-to-end — #1 on GitHub
I write about building with AI before the hype cycle catches up.
Hands-on reviews, things I'm building, and honest notes on what's actually working—sent when I have something worth sharing.
No schedule, no filler. Just the stuff I'd tell a friend who's building too.
You're in.
You'll hear from me next time I have something worth sending. Check out some recent writing below.
Recent writing
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