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 run a solo studio: 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.

Myth of the Designer Founder

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

I partner with a few founders at a time, so every project gets my full care. We start with a short call. If it’s a fit, you’ll have a proposal within 48 hours and a kickoff the following Monday.

Sprint
Two Weeks
$80k

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 $200k

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
$25k 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 or small studio at world-class quality, delivered as code your engineers can build on. An agency’s sprint ends in a deck. Mine ends in software.

What is an elite solo studio?

One senior person with the output of a small agency. In New York it usually takes a brand studio plus an engineering shop to get from idea to working product. I cover both, so nothing is lost between the brand deck and the codebase, and it ships in weeks.

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?

People with early ideas. Usually a founder at pre-seed with something new. Sometimes a venture fund incubating a company, or a product leader at an established organization exploring an idea in a new way. The earlier, the better.

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 $80k, fixed, for two weeks: a name, a brand, and a working prototype. Most sprint studios charge less and hand you brand assets. Here you leave with software you can demo to investors. 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.

What does Advisory include?

A monthly working session on product, brand, fundraising, and hiring, plus async and ad hoc access as needed. $25k 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. Less is more. The fewer moving parts, the better the result. Generalists over specialists: the best ideas live where design, code, and product overlap, and a specialist never lives there.

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.

Where are you based, and do you work remotely?

New York City. I run engagements remotely from my studio. Demos every Friday. Always around to grab coffee.