Mercari, Inc.
Mercari
I was the design lead for the Mercari marketplace across web and mobile (iOS and Android). It's a peer-to-peer platform with over 100M installs where people list items in seconds and find deals up to 70% off retail, spanning clothing, electronics, collectibles, and just about everything else.
01 · The problem
A peer-to-peer marketplace with 100M+ installs needed its listing flow stripped of friction and visual consistency across web, iOS, and Android.
02 · The diagnosis
On a marketplace, supply is the product — and every second of listing friction was choking it. The fix: strip listing to under 60 seconds (photo, description, price, publish) to drive volume and retention, and unify the design system across web, iOS, and Android so one coherent experience ships instead of three divergent ones.
03 · What shipped
- Spearheaded the design system effort that brought visual consistency across web, iOS, and Android, locking in shared color contrast ratios, component libraries, and interaction patterns that sped up design-to-engineering handoffs.
- Rethought the listing flow to strip out friction: sellers can snap a photo, write a description, set a price, and publish in under 60 seconds, which directly boosted listing volume and seller retention.
- Crafted accessible, mobile-first interfaces with meticulous attention to color contrast, type hierarchy, and touch targets, helping earn a 4.8-star App Store rating backed by 1.9M+ reviews.
04 · The numbers
- 100M+
- Global Installs
- 4.8★
- App Store Rating
- 1.9M+
- Reviews
05 · What I'd do differently
Draft — Chris to supply
What Chris would change with what he knows now — the honest retrospective that makes a case study worth reading.
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