Building internal tools for t-Mobile
Timeline
Summer 2025
Role
Product Designer
team
2 PM
2 Engineers
1 Designer (me!)
tools
Figma
Overview
During my summer internship on T-Mobile’s T-Ads (Vistar Media) team, I focused on designing internal tools that supported the company’s growing digital out-of-home (DOOH) ecosystem.
Debugger Tool for Internal SWE
I designed and launched a 0→1 internal debugger for T-Mobile’s ad-tech engineers. The tool let developers pull metadata about live ad campaigns directly from Vistar Media’s API, streamlining issue diagnosis and performance validation.
Campaign Viewer for Media Owners
I led the design for a platform that helped independent business and venue owners visualize what ads were scheduled to run across their screens. The tool balanced high-level campaign overviews with granular creative details, giving users transparency into their ad inventory and scheduling.
want to learn more?
The products and designs I worked on are private, but I’m happy to chat more about my process over a call. Reach out to me at emmiwu[at]sas[dot]upenn[dot]edu !