Hi, I'm David
but most call me DJ.

I build consumer products.
Just moved to San Francisco; say hi.

Career timeline

I've been blessed to work with some incredible people

2026–present
a16z · Special Projects
Building networks in San Francisco.
2022–2026
Tapestry · Founder & CEO
Founded on the thesis that new social apps needed open infrastructure to compete. We built Zumi, an AI companion that grew to 160k users, and raised $12.5M and wound it down in 2026.
2020–2022
Union Square Ventures · Analyst
Focused on early crypto, climate, and education. Spent most of my time thinking about open infrastructure, where I started building the conviction that would become Tapestry.
2018–2020
Lyft · Quality Engineer
Made sure the rider-pickup experience was seamless through IPO.
2015–2018
Snap · Quality Engineer
Member of the early Stories team. Helped ship new features pre-IPO.
2012–2014
NYU
Studied psychology. Dropped out, learned to code.

Writing

All writing

Projects

A macOS app that turns AI coding sessions into a structured dev log.

A market map of New York’s early-stage AI ecosystem, rebuilt nightly.

More projects & details

ZumiAn embodied AI companion for Gen Z, built on the idea that persistent relationships with AI characters could meaningfully reduce loneliness. People spent 17 minutes a day with it across voice, chat, and video. Under the hood: a multi-model stack across OpenAI, Minimax, and Gemini.#zumichat →Product Hunt →Introducing Zumi 2.0 →
PrimitivesPlatform for collecting digital art and building community around on-chain objects. Artists and collectors minted 500k NFTs from their camera roll.Art show →Journal →Art Basel exhibit →
SSE, Solana Social ExplorerOpen-source trading platform for Solana memecoins and emerging tokens. Did $50M in trading volume in its first two months.GitHub →

Solo projects I work on in my spare time.

BrambleA macOS desktop app that runs in the background while you work in Claude Code or Codex, capturing the full event stream — prompts, tool calls, file edits, model responses — and turning it into a structured dev log. Nothing leaves the machine unless you choose to ship something.
AI Atlas NYCA market map of New York's early-stage AI ecosystem, rebuilt nightly. An agent pipeline scrapes funding announcements, LinkedIn signals, and founder activity, re-clusters companies by category, and publishes a new version by morning.

From the camera roll

a closer look