David Steinbroner

Full-stack product manager and builder. I build things for people, not users.

Case Studies

Fold

Shipping Tax Season at a Startup

Fold launched bitcoin selling in 2024, which meant ~5,000 users needed tax documents by mid-February 2025. By December, they were seeing tax emails from Coinbase and other crypto platforms and wondering where Fold's was. I got bandwidth in November, built a prototype, became the crypto tax expert, coordinated 8+ stakeholder groups, and shipped in 10 weeks with 2 engineers and a junior designer. Mid-January; a month ahead of deadline.

Fold

Completing the Bitcoin Flywheel, and Paving the Way for IPO

Fold users could already earn and buy bitcoin. Competing with Strike and Coinbase meant completing the loop. I built the prototypes, navigated a complex stakeholder landscape, and embedded in the Bitcoin community to understand the full user spectrum. Then shipped Sell, Receive, and Direct to Bitcoin, completing the Bitcoin Flywheel. Trade volume jumped 50%.

Fold

The Most Public Feature at the Company, and I Had to Make It Worse

Fold's Spin Wheel was the company's most beloved feature and its biggest financial liability. I inherited it and spent 18 months navigating the tension between what users loved (massive rewards) and what the business needed (sustainability), eventually landing on a model that works at any Bitcoin price up to $1M while still driving 50k daily spins.

Fold

No Bandwidth? Ship It Anyway

The community had been asking for notification preferences for three years. At a startup, bandwidth is always the blocker. So I found a way to ship it without engineering.

Personal Projects

An AI-Powered TTRPG That Removes the Human Barriers

Tabletop RPGs have two accessibility problems: trying new things with strangers is intimidating, and traditional fantasy isn't for everyone. I identified that GenAI uniquely solves both, private experience plus dynamic worldbuilding, and built Story Mode to prove it.

Building

Story Mode— AI-powered TTRPG. Generative AI runs the game—narrative, NPCs, encounters. Exploring how to make AI useful for interactive storytelling.
POGO PAL— A free website for casual Pokemon GO players that provides more accessible assistance than other similar sites; fun UI exploration.
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— Track local government meetings and decisions. Making civic engagement accessible. Currently under construction.
This Site— Building my portfolio in public with Next.js and Linear. View on GitHub →

Built