English-speaking test preparation apps
I developed the TOEIC Speaking app Tosme and the OPIc app Opicme. My work combined architecture and payment improvements in Tosme with planning, answer-submission flows and store releases for Opicme.
Screens
From an answer to learning feedback
The apps use AI assessment and correction to show scores and improvements after mock-test answers. I worked on both an existing app’s improvements and a new app’s development.
Tosme purchases and refunds
I redesigned the architecture and integrated iOS and Android payments. Transactions are checked against orders to avoid duplicates, while a separate refund path expires access when the original order matches.
Opicme submissions and notifications
I implemented answer recording, conversion, submission and result display and released the app on both stores. Notification handling follows app state, with deep links to the relevant screen.
Architecture
