John Rothfels

building. previously (acq @appfolio), lecturer @ucla, head of engineering @sourcegraph.

[John Rothfels @rothfels]

frontier lab CLI:

2026-02-26T08:04:55.141Z - "echo hello world with bash"
2026-02-26T08:04:56.667Z - <tool use generated>
2026-02-26T08:05:05.787Z - <tool result>

[John Rothfels @rothfels]

Being rate limited by my coding agent feels like

Please, take my money

[John Rothfels @rothfels]

@sqs @martian_mishra Agree. Spin up as many instances of Claude Code as you can manage in parallel, don't bother with Cursor, and don't look back.

The most annoying part of coding work now is window management.

[John Rothfels @rothfels]

@tysheaff @cursor_ai The real question is why copy/pasting from an editor buffer attaches a snippet instead of inlining the code. I have never once wanted to attach a snippet

[John Rothfels @rothfels]

@tysheaff but muh podcast meth

[John Rothfels @rothfels]

Just use Swift, they said

[John Rothfels @rothfels]

@dcposch Tax exemption is good for business

[John Rothfels @rothfels]

@levelsio Mostly the bad

[John Rothfels @rothfels]

LangChain is the Create React App of LLMs, both the good and the bad

[John Rothfels @rothfels]

@martian_navy @ProofOfKeags Whatever AI is the best at writing code for

[John Rothfels @rothfels]

@martian_navy The dumbness is proportional to the size of the JSON and the likelihood your schema grows

https://t.co/9nCW9bJCv5

[Vinay Hiremath @vhmth]

I loathe Postgres' JSONB column. The most easy to abuse column type. Has caused numerous incidents and tons of technical debt/slowness. Has probably cost us millions in lost revenue at this point.

[John Rothfels @rothfels]

caching strikes again

[John Rothfels @rothfels]

ChatGPT plugins vs YCW23

[Turner Novak 🍌🧢 @TurnerNovak]

Smoothest shot I’ve ever seen

[John Rothfels @rothfels]

Got an InMail

“John, heard great things about Stealth Startup!”

It’s amazing how confident I am that a human wrote this and not GPT-4.

[John Rothfels @rothfels]

Can Apple just hurry up? We’re all waiting

[John Rothfels @rothfels]

Just got off the waitlist for every single ChatGPT product

[John Rothfels @rothfels]

LangChain is the Create React App of LLMs, both the good and the bad

[John Rothfels @rothfels]

@sqs @tailwindcss Copilot

[John Rothfels @rothfels]

Is it just me or is Microsoft PowerPoint an oxymoron?

[John Rothfels @rothfels]

We call this a cluster fuck

[John Rothfels @rothfels]

@beyang