Mobile app had terrible UX - crashes, broken features, 3.4 rating. I led complete app refresh addressing technical debt and UX pain points. Rebuilt core flows, optimized performance, redesigned navigation, fixed crash-prone features.

Result: Monthly users up 45%, 35 new corporate clients in 4 months, NPS 48% to 63%, app rating improved to 4.6, crash rate down 78%, feature adoption up 52%.