# Exa App A self-custodial wallet with a Visa card, on iOS, Android and the web. I lead its frontend team. - Role: Head of frontend, Jun 2026 – Present; Senior frontend developer, Jul 2024 – Jun 2026 - Period: Jul 2024 – Present - Team: Two in frontend - Stack: TypeScript, React Native, Expo, Expo Router, Tamagui, TanStack Query, wagmi, viem, LI.FI, Account Kit, Hono - Live: - Source: - App Store: - Google Play: ## Numbers - **Volume processed by Exa**: US$17M+ - **My commits on main**: 1,294 - **My merged pull requests**: 74 - **Mobile releases since November 2024**: 110 ## Screens - **Home**: The Exa App home, with the portfolio balance, the deposit, send, swap and borrow actions, and the card's pay mode set to pay now. - **Swap**: A swap of ETH for EXA, with the amount on each side, the exchange rate, the network cost, the fee and the maximum slippage. - **Swap completed**: The confirmation of a successful swap worth US$200. - **Tokenized stocks**: The welcome to tokenized stocks, which invites people to invest in companies they know, such as Tesla, Apple and Meta. ## Context [Exa App](https://exactly.app) is a self-custodial wallet with a Visa card. People deposit crypto and earn yield on it, then spend with the card: they pay now from their balance, or split a purchase into up to nine fixed-rate installments borrowed against their own crypto, with no bank account or credit score. Exa Labs never holds their funds, and it neither issues the card nor lends: a licensed issuer issues the card under Visa, and the credit comes from the open-source lending markets of Exactly Protocol. The wallet is a smart contract account, so people sign in with a passkey instead of a seed phrase and the app pays their gas. It runs on OP Mainnet and on Base. One Expo codebase ships iOS, Android and the web, and a Hono server sits behind them. The monorepo is [public on GitHub](https://github.com/exactly/exa). Since June 2026 I have led its frontend team. I joined in July 2024 as a senior frontend developer. ## Problem Money in a self-custodial wallet lives across networks and assets. Every feature has to work for someone who never thinks about chains, gas or bridges, on a phone and in a browser, from the same code. ## Constraints - The keys stay with the user, in their passkey, so the app has to prevent mistakes that nobody can undo afterwards. - One codebase serves iOS, Android and the web. ## Approach - **Core flows**: onboarding, card management, payments and portfolio, integrated with Exactly Protocol's on-chain markets for deposits, borrows and installment payments. - **Server**: integrated identity verification through Persona with [card issuance](https://github.com/exactly/exa/commit/37df050c6355dec315cc9b42544a4036c9bf1b7a) and [card freezing](https://github.com/exactly/exa/commit/6ee1292d3e422d54607ab6f58fa511fac928d8b8), and [fixed a stale web HTML cache](https://github.com/exactly/exa/pull/1289) that served outdated pages. - **Base launch**: shipped the app side of the Base network launch (token integration, bridging, swaps and funding flows) with the backend and smart contract teams. - **Multi-chain swaps**: [implemented multi-chain swaps](https://github.com/exactly/exa/pull/1300), on top of [recovering assets sent on other networks](https://github.com/exactly/exa/pull/970) and [batched calls with `sendCalls`](https://github.com/exactly/exa/pull/879). - **Send to any network**: [sending any asset to any network](https://github.com/exactly/exa/pull/1292), Bitcoin and Solana included, with the swap or bridge routed through LI.FI, and a [gas policy that pays bridge fees with the tokens already on that network](https://github.com/exactly/exa/pull/1020). - **Tokenized stocks**: a [distinct interface for tokenized stocks](https://github.com/exactly/exa/pull/1322), the Coinbase-issued tokens on Base that track US shares and trade through swaps. - **App shell**: [app routing](https://github.com/exactly/exa/pull/1238), [deep link entry](https://github.com/exactly/exa/pull/1243) and [support chat from any route](https://github.com/exactly/exa/pull/1260). - **Quality**: extended the Maestro end-to-end tests for payment flows on iOS and Android and traced release blockers to their root cause, including bugs in third-party libraries. I [reported some of them upstream](https://github.com/reown-com/appkit-react-native/issues/496). ## Outcome - **Three languages**: the app ships in English, Spanish and Portuguese since I set up its localization in May 2025. - **Releases**: about one mobile release a week, since the first in November 2024.