Ethan Shea

CTO @TheRegbase, YC P26

[Ethan Shea @ethshea]

Introducing Regbase: The AI-native Legal Research Platform

Built alongside big law firms, @theregbase cuts 100-hour research projects into work that can be done in just one.

[Ethan Shea @ethshea]

@frantzfries merge button was moved to the top

[Ethan Shea @ethshea]

Claude thinks it's is a subtle bug

In reality, I suck at architecture

[Ethan Shea @ethshea]

Github's redesign being extra ominous today

[Ethan Shea @ethshea]

Motion to abolish sql and just start sending physical plans

[Ethan Shea @ethshea]

rewriting the SQL to trick the query planner

[Joe Choi-Greene @JoeChoiGreene]

Build vs buy is such a short-term view. It's more like maintain vs subscribe

[Ethan Shea @ethshea]

@themishra4402 yeah because those databases are designed for actual scale

[Ethan Shea @ethshea]

Finally learned the difference between Codex and ChatGPT

AMA

[Ethan Shea @ethshea]

I miss the wit and charm of a human-named variable

[Ethan Shea @ethshea]

@reidhoffman Institutional stability is the most reliable predictor of economic growth

[e2e @e2e]

TesterArmy is now e2e.

The software verification layer for the agentic coding era.

Announcing our new brand identity and $8M seed round.

https://t.co/4Go8iRhsU1

[Ethan Shea @ethshea]

@vercel Is this deepsec as a service?

[Ethan Shea @ethshea]

See more here: https://t.co/tKX2SHcP3t

[Ethan Shea @ethshea]

The sentiment towards data centers shifted in October 2025

[Ethan Shea @ethshea]

Policy has been made at the state, county, and city level

[Rikiya Takehi @rikiyatakehi]

We asked GPT-6 Astra to edit Qwen3.5-0.8B weights to improve math.
It directly changed only 0.016% of weights, fixing 0.8B's reasoning loops & improving math up to 6x and even instruction following 3x, without gradients or training.

We call this Weight-Space Programming: frontier LLMs can now natively read/write neural network weights! 🧵
Blog: https://t.co/bOWCcFhCVq

[Ethan Shea @ethshea]

Who's building the WorkOS of "add a chatbot to my app"?

[Ethan Shea @ethshea]

Good Abstractions > Vibe Slop

Read the code.

[Ethan Shea @ethshea]

@shcallaway thanks for the new stress-reducing background sounds to fall asleep to

[Matthew Yglesias @mattyglesias]

Jean-Luc Picard remains the single most compelling vision of progressive politics I am familiar with — secular, rational, compassionate, egalitarian; a believer in progress & abundance but also duty, hard work, and a constant battle for self-improvement and improving the world.