Vue 3 migration + performance overhaul (1 of 4 engineers), LCP 3.03s → 1.07s, Lighthouse 33 → 65.

Stepped out of the simple "senior service" framing and learned that care is a network.

Korea's first traditional-market delivery app, saw the app's real problems by going on deliveries myself.

"User experience is a brand's first impression", one person, one month, turned a stiff corporate identity into something warm.

Grand Prize from the Minister of Science and ICT (SW Quality Insight Conference).

"Technology only creates real value when it speaks the language of the domain", replacing a 10-year-old ASP legacy with Java 17 wasn't a tech problem; it was a fieldwork problem.

"Moving the offline experience online, that's real web development", 30% more visits, 50% more franchise inquiries.

Jaemiro is an app where watching ads lets you enter, and entering really does mean receiving. We cleared 20% ad participation in the early launch period, and winners' verification photos became a natural marketing asset. Over three months in a three-person team, as PO, I shipped planning, design, development, and operations, and learned that rewards can buy participation but never trust. I wrote "see for yourself" instead of "trust us" into every page.