Fold·January 2025
Shipping tax season at a startup
Shipped the integration in 10 weeks — a month ahead of the IRS deadline. 80% of eligible users pulled their 1099; 1% ticket rate
David Steinbroner
Product manager who prototypes, codes, and ships. I've taken features from an abstract idea to production at a fintech startup, and I spend my free time building apps and learning new tools. I build things for people, not users.
Selected Work
Fold·2024
The most effective product team is the conduit
Rebuilt the approval system across a dozen external partners and vendors. Cut timeline by 75%; helped Fold become the first Bitcoin-only company on Nasdaq.
Fold·January 2024
Completing the flywheel and paving the way for IPO
Shipped three features over six months across two custodians with incompatible APIs. Trade volume up 50%; Direct to Bitcoin hit 20% adoption month one
Fold·2024
The most public feature at the company, and I had to make it worse
Eighteen months and eight iterations to turn Fold's most beloved (and most expensive) feature into something sustainable. Still drives 50k DAU.
Slought Foundation·2025
Rebuilding Ai Weiwei's trilingual cultural archive before it disappeared
Preserved and future-proofed a cultural archive of that would have been lost to deprecated infrastructure.
Fold·2024
Shipped quietly. Saved thousands of support tickets.
Built the replacement system before thousands of cards started expiring — and required user confirmation instead of auto-shipping. Zero disruption at launch, 1–2% ticket rate.
Fold·2024
No bandwidth? Ship it anyway.
Three-year community ask, zero engineering bandwidth. Shipped as a third-party integration with a Figma-designed custom page; 50% of users adjusted their preferences.
Testimonials
“An incredible addition to my team — a great thought partner, extremely proactive, and could be relied upon to take ownership and see things through end-to-end. He has deep empathy for users, always thinking about UI/UX from their perspective.”
Mitch Port
VP of Financial Strategy & GM of Credit & Loans · Fold
“Day one, I knew we had a keeper. David is engaged in every aspect of his day-to-day — always going above and beyond, asking thoughtful questions, and driven by passion for the greater purpose.”
Tom Kunhardt
Corporate Trainer, Learning & Development · NRG Home Solar
Building
Story Mode— AI-powered TTRPG that removes the two things keeping people out of tabletop gaming: playing with strangers and being stuck with fantasy. AI runs the game.
POGO PAL— Pokemon GO helper for casual players. Most Pokemon GO sites are built for hardcore players; this one isn't. Also a fun UI experiment. The scanner and collection tools live in a separate case study.
Discovering Magic— A gateway to Magic: The Gathering through things you already love: Fallout, dinosaurs, anime art, Furby cards. Discovery over terminology. Currently under construction.
Local Gov Watch— Follow what your local government is actually doing. Meeting summaries, decisions, votes, without digging through PDFs. Currently under construction.
This Site— Building my portfolio in public with Next.js and Linear. View on GitHub →