Lead Design Builder: Marketplace

Alt is unlocking the value of alternative assets, starting with the $5 B trading-card market. We let collectors buy, sell, vault, and finance their cards in one place and we are backed by leaders at Stripe, Coinbase, Seven Seven Six, and pro athletes like Tom Brady and Giannis Antetokounmpo. Our next frontier is real-time pricing at scale—the Alt Value that powers every trade, loan, and product on the platform.

You own the marketplace surfaces where that decision happens — listing and submission, the offer moment, bidding and auction close, payout, the places where Alt asserts a price and asks someone to act on it. Design at Alt isn't a service function that receives requirements. It's the discipline that writes them.

The bar you're held to: every surface you own ships with a written problem frame, a metric instrumented before launch, a readout you ran yourself — and craft good enough that a user screenshots it and sends it to someone. One without the other doesn't count here. A beautiful screen that didn't move anything is a miss. A number that moved on a surface nobody wants to look at is a different kind of miss.

• The problem. You write the framing for your surfaces: who's hurting, the evidence, the number that says it's real, the metric that says it worked. AI-assisted, design-reviewed, never skipped. If nobody can state the problem in a sentence, it isn't ready to be solved.

• The craft. How completely the solution solves the problem, all the way to delight. It runs the full arc: reading the problem so precisely that the solution feels obvious in hindsight, shaping the flow so the user never has to think about the tool. It takes a user from "this worked" to "I want to show someone." That's still made by a person with taste and reps.
  
  We can generate a hundred options in an hour; you're here because you can make one of them solve the problem so well it delights.

• The solution space. Multiple real directions, converged against your surface's written bar. You'll pressure-test, extend, and validate with users — not pick the first thing that renders.

• The experience decisions. When a thing appears, what it feels like in the user's actual state, what tone it takes, what gets removed to make room, and what it does to neighboring screens. On a platform where people wire five figures based on what a screen makes them feel, these decisions are the product.

• The words. Copy is design here. The sentence that explains why an offer is what it is does more work than the layout around it. You write it.

• Trust, specifically. How much confidence we assert, when we show uncertainty, what the platform states versus suggests. As more of what we show a user is model-generated, this becomes the highest-stakes surface in the company, and Design has sign-off on it.

• The crafted base. The quality foundation your team iterates on, and its survival through implementation. You pair with engineers at ship time; built-versus-designed fidelity is yours.

• Your metrics. Instrumented before launch. You run your own readouts and kill your own misses.

• The research. Customer conversations every week, CX tickets and session replays mined as a habit, lightweight tests run by you, at the pace of the work. Your frames cite evidence because you went and got it.

• The prototype. You build. Working prototypes in code, not click-throughs, are how ideas get evaluated here, because a thing you can touch settles an argument in an afternoon that a doc would run for two weeks.

We don't want to hear that you use Claude every day. Everyone does. We want to know what you've built with it. Concretely, in this role:

• Get to a clickable prototype of a new flow in a day — real card data, simulated model output, testable interactions — so the team argues about a real thing instead of a doc

• Write a Claude skill that holds your surface's written bar
  , so every frame gets checked against it before it reaches review, and the bar stops depending on who's in the room

• Mine CX tickets and session replays at volume to find the pattern you'd never catch by hand — the phrasing that precedes an abandoned submission, the screen people…