Capitual
Cripto Bank App
Oct 2021 — Nov 2022
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Capitual needed a fast, multi-lingual mobile banking app that stayed smooth across iOS and Android — including budget phones and tablets, not just flagship devices.
I worked on mobile feature development, building interfaces in React Native, Expo, Styled Components, GraphQL, React Query, and Axios. I architected full i18n localization across English, Portuguese, and Spanish, added tablet-responsive breakpoints, and reviewed pull requests to help enforce the team's testing standards.
Highlights
- Architected complete i18n localization across English, Portuguese, and Spanish
- Applied strategic memoization (useMemo, useCallback, React.memo) to eliminate redundant re-renders
- Added custom responsive breakpoints so the app worked well on tablets, not just phones
- Cut mobile bugs by 60% and raised the App Store rating from 3.5 to 4.8 stars
Challenges
- Keeping a steady 60–70 FPS on low-spec, budget Android devices
- Tracking down and eliminating unnecessary re-renders across a growing component tree
- Extending a phone-first UI to tablet form factors without a redesign
CompletedOct 2021 — Nov 2022
React NativeExpoStyled ComponentsGraphQLReact QueryAxiosi18nGit