This app lets you invite your friends to various events via text message, and it keeps track of who RSVP'd. As you send follow-up messages, it automatically excludes those who have declined. It is a web app, so it is not limited to any platform. It is, however, limited to your Google contacts list.

• React SPA
• ASP.NET Core API
• Google token service
• Twilio message service

• OAuth 2.0 authorization code flow used to authenticate user and obtain his/her contacts
• Thereafter, the user remains signed-in to the application via cookie
  • Primary auth cookie implemented with HttpOnly to hide it from XSS
  • Additional cookie and header token implemented to mitigate CSRF
  • FYI, primary auth cookie was chosen over JWT token due to later's vulnerability to XSS

• Routing
  • React Router v4
• State
  • Custom state framework built from scratch (rather than Redux)
  • Components subscribe to a central data store via a higher order component (HOC)
  • The HOC connects to the store via React's Context API
  • The HOC is a PureComponent, so it only updates when its props or state change
  • The HOC's state is limited to the state needed by its child component, thus avoiding unnecessary rerenders
  • The child component is a PureComponent, so it doesn't rerender if its props or state haven't actually changed
• Testing
  • Jest & Enzyme
• Syntax
  • ES9 transpiled via Babel
• Build
  • Webpack
  • Separate app and vendor files
• Server side rendering
  • Couldn't get it to work with ASP.NET =(
• Component and style framework
  • Material-UI v4
  • Material-UI Pickers v3