Justin Choo Email & Phone Number

Seattle, Wa, Us

Seattle, Wa, Us

• Utilized React’s reusable component architecture and virtual DOM diffing algorithm to efficiently render UI with dynamic data derived from traversing the DOM, enabling users to seamlessly envision and interact with the rendered data• Spearheaded TypeScript integration on top of React to enforce static typing and to provide interfaces for intermediary React components when passing data throughout the application, guaranteeing type-safety at runtime to increase team performance, and improving consistency as well as readability across distributed developer teams• Integrated D3.js to calculate positions for dynamic rendering of nodes and paths to create collapsible tree graphs as well as to visualize the atom-selector network, allowing users to intuitively understand the component hierarchy tree and its subscriptions• Introduced React Hooks to take advantage of functional programming paradigm to organize stateful logic inside a component into reusable isolated units and to encapsulate side effects of React lifecycle methods, thereby improving code readability• Employed Jest and React Testing Library by taking snapshots of the application lifecycle and creating mock data used for unit testing to write user behavior-based tests that enforce TDD best practices and to ensure code consistency• Leveraged Web Storage API as a lightweight client-side caching solution by engineering data flow between NPM module, Chrome browser application, and the dev tool, to implement state persistence feature allowing users to easily regenerate state after reload• Devised a throttle algorithm that gives the user to control function call for the Recoil API’s observer hook that tracks state changes and generates snapshots in order to optimize performance for large scale applications and prevent the tool’s overload• Maintained and developed product under the tech accelerator OS Labs (opensourcelabs.io)

Berlin, De

• Developed a React Native mobile application by leveraging its platform agnostic nature to write a single codebase for both iOS and Android to ensure rapid development and maintainability, as well as to design an accessible, responsive, and performant mobile UI• Incorporated Apollo Client to populate localized state with query results from the GraphQL backend that allow precise queries and mutations with built in caching to efficiently render retrieved data onto the application

Berlin, De

• Designed a SPA with React Router by writing Route and Link components in order to redirect users to different views while minimizing server calls as well as to efficiently render multiple viewports for a seamless browsing experience• Established Node.js server with Express middleware design pattern to create RESTful API, writing routers and controllers to modularize backend requests and enhance control flow in client-server logic• Architected PostgreSQL database to store relational data between users and ideas by utilizing ACID compliant transactions with predictable and intuitive database schema while establishing balance between durability and database performance• Configured Webpack and Babel to transpile ES6 features as well as the application’s React JSX and CSS files to browser compatible Javascript with minimal bundle size from minification and uglification of source code to effectively deliver client-side logic• Utilized Passport.js to implement Github OAuth strategy to provide the application with secure delegated access as well as to decrease user bounce rates by simplifying the authentication process for the targeted userbase

Berlin, De

• Incorporated React Material-UI components throughout frontend development to ensure adherence to Google’s Material Design guidelines, implementing a UI that provides a consistent visual experience and guides users through hierarchy of information• Established Node.js server with Express middleware design pattern to create RESTful API, writing routers and controllers to modularize backend requests and enhance control flow in client-server logic

Los Angeles, California, Us

• Collaborated with business analysts to communicate technical requirements for internal trade processing systems such as TEMS, proposed solution architecture and supported process automation that decreased manual correction of trade errors by 10%• Provided operational support to 15 correspondent broker-dealer clients and monitored two trade processing systems

New York, Ny, Us

• Profiled and analyzed investment products to develop customized financial strategies for clients' financial needs