Designing a Buyer-First Marketplace by Fixing the System Behind It

TRADZ is a marketplace built for serious collectors and high-value sellers in the collectibles industry — TCG, MTG, Pokémon, One Piece, and other trading card ecosystems.

When I joined, most team discussions were focused on the seller side: dashboards, card management, transaction flows. But from a product perspective, I saw something more fundamental — buyer experience will never be healthy if the system behind it is messy. A marketplace is a two-sided product. What buyers see on the front end is entirely shaped by how sellers manage data on the back end.

Approach

Separating Dashboard from Analytics

One of my earliest decisions was separating operational dashboard from analytics. Sellers with overloaded screens lose focus and manage listings more slowly — leading to inaccurate product details. A focused dashboard meant better-maintained listings, which directly improved buyer trust.

Card Management

In the collectibles industry, one small mistake breaks buyer trust instantly. I designed card management around one principle: one card should always represent one clear truth. From data input to listing status, the system had to guarantee that what buyers saw on the front end could be trusted without hesitation.

Transaction Data Structure

A single order could contain multiple cards with different conditions and values. I pushed for clearer labeling so that what sellers managed internally would remain accurate for buyers during checkout and order history.

Speed Under Pressure

Toward the final phase, the team needed multiple designs within an extremely short timeline. I completed more than ten end-to-end mockup pages in a single night — because the structural foundation had already been built, I could move quickly without sacrificing consistency.