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.

HSLA0001HSLA0001Founder & CEO, 2024–Present
MultiMultiFounder & CEO, 2021–2024
Cash AppCash AppProduct Design Principal, 2017–2021
MarkdownUI

June 23, 2026 · 9m

Interfaces are about to become readable and streamable.

Advice for Designer Founders

Soon

The craft is the easy part. It’s everything else that no one prepares you for.

Agency and Time Dilation

Soon

Time gets more difficult, richer, and longer when you own your decisions.

Whatnot
Shopify
Faire
Cash App
Square
Squarespace
Mirror
Expa
Oscar
Outdoor Voices
Justworks
Compass
How it works

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.

Sprint
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 sprint
Zero to One
6–12 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 project
Advisory
One 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 slot
Why one person instead of a design agency?

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 as code for your engineering team.

Why hire an outside perspective?

Inside a company every idea has history and someone attached to it. I show up with neither. I see the product the way a new user or an investor sees it, and I can say what people inside can’t.

Who do you work with?

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.

Which engagement is right for me?

Founders with a new idea start with a Sprint. If the product is already defined and needs to get built, Zero to One. Funds, studios, and design leaders who want me around over time take Advisory. Not sure? Book the call and I’ll tell you straight.

How much does a design sprint cost?

A 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.

Do you do branding?

Yes. Every Sprint includes a name and a brand alongside the working prototype.

Can a Sprint turn into a bigger build?

Often. The prototype becomes the blueprint, and the person who designed it builds it. Nothing gets lost in a handoff.

How flexible are engagements?

The price and the timeline are fixed so you always know the cost and the date. What we aim them at is flexible: a brand, a product, a rethink of something already live.

Do you deliver production code?

Yes. Sprints deliver working prototypes in code, and Zero to One engagements ship production code alongside your engineers.

What does Advisory include?

A monthly working session on product, brand, fundraising, and hiring, plus async and ad hoc access as needed. $16k per month plus equity.

Do you take equity?

Advisory includes equity on top of cash. Sprints and builds are cash engagements.

Who owns the work?

You do. Names, brands, prototypes, code. Everything is yours at the end of the engagement.

What’s your design philosophy?

Taste at speed. Working software instead of decks, and the fewest possible steps between an idea and something you can touch.

How fast can we start?

An intro call, a proposal within 48 hours, and a kickoff the following Monday.

What happens on the intro call?

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.

Where are you based, and do you work remotely?

New York City. Engagements run remotely with demos on Fridays, and if you’re in New York I’m always around to grab a coffee.

Mac or PC?

Always Mac. I’ve only used Apple computers my entire life.

What do you listen to while you work?

Mostly the same few songs I’m feeling that month. Usually Aphex Twin’s Xtal on repeat.