Eli Rousso
New York City
Over 20 years of design and technology. I’ve founded companies, raised capital, and shipped world-class products used by millions. Now I build software and work with founders to ship taste at speed.
MonochessFull chess in one tiny file.2026 · Games · Free
SlateOn-device private journal.2026 · Journaling · Subscription
RamsCatch UI bugs before they merge.2025 · Dev Tools · Subscription
AutobahnA kanban board in your markdown.2026 · Productivity · OSS
VoidWrite with zero distractions.2025 · Writing · One Time
ProtocolRefined noise for focus and calm.2025 · Focus · One Time
LoopA minimal timer for deep work.2025 · Focus · One Time
StackThree habits. Ninety days.2025 · Habits · One Time
SohoPocket fashion advisor.2025 · Fashion · Subscription
CrownFor watch enthusiasts.2025 · Watches
HSLA0001Founder & CEO, 2024–Present
Cash AppProduct Design Principal, 2017–2021Interfaces are about to become readable and streamable.
The craft is the easy part. It’s everything else that no one prepares you for.
Time gets more difficult, richer, and longer when you own your decisions.
We start with a short call. If we’re a fit, you’ll have a proposal within 48 hours and a kickoff the following Monday.
Two Weeks
$48k
Ideas are fragile things. I make them durable through prototypes. Two weeks of design as code, end to end: a name, a brand, a working prototype. Demos on Fridays.
Book a sprint6–12 Weeks
From $144k
For serious ideas ready for deployment. I design the product, prototype it in code, and work with your engineers to build and iterate into production.
Start a projectOne Session a Month
$16k per Month + Equity
A monthly working session on highest priority items from product, brand, fundraising, to hiring. Async and ad hoc as needed.
Request a slotA Sprint is $48k, fixed, for two weeks: a name, a brand, and a working prototype. Demos on Fridays, and everything is yours at the end.
An agency gives you a team, a process, and handoffs. I give you experience across design, product, and engineering, faster than an agency at world-class quality, delivered in code for your engineering team.
Yes. Sprints deliver working prototypes in code, and Zero to One engagements ship production code alongside your engineers.
Founders, mostly pre-seed through Series B. Also later-stage startups, venture funds, and public companies that need an outside perspective or want to move even faster.
An intro call, a proposal within 48 hours, and a kickoff the following Monday.
Twenty minutes on your idea: where it is, what it needs, and whether I’m the right person for it. No deck, no discovery questionnaire. You leave knowing what I’d do first.
Advisory includes equity on top of cash. Sprints and builds are cash engagements.
Always Mac. I’ve only used Apple computers my entire life.
Mostly the same few songs I’m feeling that month. Usually Aphex Twin’s Xtal on repeat.