Joshua Levy

@jlevy ·San Francisco

97 repos
4.6k followers
385 following

Python 72%
TypeScript 11%
Shell 7%
Jinja 4%
Rust 2%

9.4k contributions in the last year

53-day current streak·75-day longest streak

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Words, code, truth, kindness, other arcana Hi! In case you want to get to know me or my work, this is a cheat sheet. Finding Me @ojoshe on Twitter/X (this…

Words, code, truth, kindness, other arcana

Hi! In case you want to get to know me or my work, this is a cheat sheet.

Finding Me

@ojoshe on Twitter/X (this is best for DMs)

github.com/jlevy (for open source)

linkedin.com/in/jlevy (slow on messages

here)

Please reach out if you think you should!

Selected Work

Generally, my interests lie at the intersection of *AI*, *writing*, *software
engineering*, *design*, and *knowledge tools*:

✨NEW✨ Lately, I’m focusing on workflows for agent work and agent coding:

- Accurate reasoning and prediction with agents, including for financial analyses

- A new beads replacement with spec-driven tools:
tbd

- A new approach to research workflows:
Markform

Inspiration: I believe the purpose of technology is to improve our collective

knowledge and intelligence and to solve human problems. The technologist I most admire is Doug Engelbart. His work is as relevant today as it was 50 years ago. By sharing a vision of what was possible, he shaped how we use software for decades. I feel privileged to have met him a few times.

AI and software: I have a broad interest in the theory, the practice, and the

human elements of software engineering, and the history of software and AI. I’ve worked on conversational AI systems since early days with the original Siri team at SRI. I’ve built search engines with prominent ex-Google engineers.

Writing and open source: I’ve edited (and published) about a dozen books and I’ve

written a few popular guides (2M+ readers), including *The Holloway Guide to Equity Compensation* (the most widely read guide to equity compensation in startups), *The Art of Command Line* (150K+ stars on GitHub), and a guide to AWS. And I’ve written a number of open source libraries in Python. Popularity isn’t the best measure of value, but I’m in the top 20 most-starred accounts on GitHub.

Publishing: I started and built most of

Holloway, a small startup that has rebuilt the digital book publishing process with dozens of in-depth, web-based guides in entrepreneurship, creativity, and personal growth. We also publish print books.

Startups and entrepreneurship: I’ve been a founding engineer a few times and a

founder. I like working with founders and sometimes consult for or advise startups and investors.

Engineering: I’ve loved programming since I was a kid.

I have been a founding engineer and engineering leader at several startups in AI, SaaS, and web search, some failed, some successful (backend/distributed systems, full stack web/JS/Node/TypeScript/React, Python, Java, C/C++, and older esoteric things like Lisp and Prolog). Also devops—AWS has given me the honor of being an “AWS Hero.”

Personal

If there is one intellectual theme in my life, it is understanding the essential and
beautiful complexity of the world as best I can.
I aim to know a few things about many topics and many things about a few topics.
I majored in physics, math, and computer science and my graduate degree is from
Berkeley.

But for me what ultimately matters is simply kindness and human connection.

If you have any oddly specific topic you care a lot about, I’m curious.
For me, this includes exceptional books of all kinds, moral philosophy, media theory,
human relationships, psychology, mental health, psychedelic medicine, fitness and
nutrition, politics and media, startups and entrepreneurship, AI (history and future),
product design, typography, software engineering, logic and foundations of mathematics,
running or hiking the mountains and deserts of California, fingerstyle guitar, 15th-18th
century lute music, early American blues, Brazilian Portuguese, truth, kindness, and
some other arcana.

Projects

A few selected projects:

Agent coding

- *✨NEW✨* rust-porting-playbook: An extensive agent playbook for automated porting of Python to Rust

- *✨NEW✨* tbd: Agent coding power tool with better
beads, knowledge injection *👈 check it out, what I use every day now for agent
coding*

- *✨NEW✨* tryscript: Golden testing for CLI
apps (very useful for helping agents write CLIs for agents!)

- *✨NEW✨* Markform: Structured Markdown
documents for agents and humans

On writing

- *✨NEW✨* Practical Prose: Extensive guidelines and tools for high-quality practical writing with agents

- on-books: Readings and notes on the past,
present, and future of books

Document, text, and LLM libraries *✨NEW✨*

- repren: Agent-friendly bulk replace/rename tool

- flowmark (Python) and
flowmark-rs (auto-port to Rust): The
most advanced (and now fastest) auto-formatter for Markdown

- chopdiff: Parsing, diffing, diff filtering,
chunking, and windowed transforms of text to support LLM applications

- frontmatter-format and
sidematter-format: Simple
conventions and formats for metadata and assets on any file or alongside any file

Modern Python infra

- simple-modern-uv: A minimal, modern Python project template, good if you’re starting a new project, with uv/ruff/Pyright/GitHub actions/PyPI publishing (used by uvtemplate)

- strif: Tiny, useful Python lib for strings and
files

- funlog: Minimalist decorators for logging,
timing, and tallying function calls

- prettyfmt: A tiny library for more
beautiful Python outputs

- py-app-standalone: Standalone,
relocatable Python app builds using uv

Knowledge and content experimentation

- Kash: A powerful, Python-based AI-native shell with media and content processing capabilities (experimental but I use it a lot and it has some cool ideas!)

- Textpress: Simple publishing for complex
ideas

- Leximetry: A tool to measure the
characteristics of text

Handy hacks wrapping useful projects

- tminify: Modern JS/CSS/HTML minification with terser plus Tailwind v4 compilation as a CLI and Python library

- simplexng: A repackage of the local
SearXNG web search engine you can run with one command

A few new writings (these are rough and I’d appreciate feedback) *✨NEW✨*

*The Philosophy of Command Line*:

Some philosophical reflections on software

*Linters for Thought*: Reflections on Software

Engineering and Collective Intelligence (draft!)

Some older writings and guides:

the-art-of-command-line:

Master the command line, in one page (150K+ stars, available in ~20 languages and one of the top 40 most-starred GitHub repos of all time, but in need of an update, which I hope to do soon!)

og-aws: A practical guide to Amazon Web

Services (35K+ stars, for a while one of the most popular docs ever for AWS)

og-equity-compensation:

Original open source version of a guide to equity compensation for startup employees and founders (9K+ stars)

All public repos (97)

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