Hey, I’mJi Yeon Han

Product designer making complex, technical products feel simple and beautiful.

Focus

Recognition

Currently

eSIM Activation

Phone activation for Galaxy devices, designed inside carrier, GSMA, and technical constraints.

A payroll platform that lets a CPA review and run payroll across many client businesses.

An AI that waits on hold for you, speaks in your voice with the right nuance, and hands the call back when a human picks up.

A private marketplace for friend groups, designed and built solo with AI in the loop.

A research project on healthier phone habits, from Gen Z diary studies to a granted US patent.