My Role

Product Designer

Team

1 PM

2 Product Designers

8 Developers

1 Marketer

Timeline

Feb - May 2025

Tools

Figma

Notion

  1. What is it like now?

[Context]

Resell, Cornell’s secondhand marketplace app, launched in Spring 2024 with simple MVP.

As the user base grows, the current seller profile — just a name, photo, bio, and listings — makes it harder for buyers to feel confident in who they’re purchasing from.

Buyers don’t get enough context to judge whether a seller is trustworthy. With so little information on the profile, people hesitate — and that hesitation slows transactions and lowers trust across the platform.


How might we give buyers clearer, more meaningful signals of a seller’s credibility so they can feel confident completing purchases?

  1. What's the issue?

  1. What should I do about it?

[Problem Statement]

[Solution]

As a product designer, my goal is to design seller-credibility features that

  1. Give buyers the information they need to feel confident

  2. Increase transparency between buyers and sellers

  3. Strengthen overall trust in the app

  1. What do users think?

[User Research]

After interviewing 10 Cornell students…

Key findings:

🔍  What users look for in sellers

  • Reviews

  • Sale history

  • Item descriptions

  • Photos

  • Profile completeness (photo, bio)

  • Response time

  • Item variety

🤝 What Builds Trust

  • Positive reviews and high ratings

  • Honest, detailed descriptions and multiple high-quality photos

  • Fast and polite communication

  • Quality photos

  • Verified status (e.g., student ID)

  • Consistent selling behavior or style

⭐ Motivations for Leaving Reviews

  • Extreme experiences—either exceptionally good or bad

  • To support trustworthy sellers or warn others

  • Incentives like reciprocal ratings or discounts

Translating these to feature ideas…

↓

🔍  What users look for in sellers

  • View reviews

  • Number of items sold

  • Average rating

  • Average response time

🤝 What Builds Trust

  • Ratings

  • Last active status

  • Verified status indicator

  • Seller review summary

  • Direct message sellers

⭐ Motivations for Leaving Reviews

  • Two-way street review system (buyers also receive a rating)

  • Agreeing/disagreeing with other user reviews

[Ideation]

  1. How

Current seller profile screen

Thankfully, I was handed off with previous product designer's designs as a starting point.

This is where I'm left off with:

Let's Connect!

→ yl3697@cornell.edu

© Yoobin Lee 2025

Edge Cases

still a young app so a lot of newly created profiles might not have a lot of elements on it

[Exploration]

Next Steps & Reflection

Final Profotype

challenge: balancing between staying cohesive with the established design system vs.

I did two rounds of mid-fi explorations because I was attached to the idea that I had to design somehting similar to the previous designer's designs.

Feature 1: ratings & # of items sold

Feature 2: seller review summary

feature 3:

Case Study on…

I Forgot Again: Google Tasks

Progress tracking feature on Google Tasks