Planning-Poker is a web app to facilitate User Story estimation meetings. All team members can connect to a planning poker session and vote on the complexity of each ticket. No authentication is required and the votes are anonymous. All session state is stored between clients, nothing is persisted to the server. Build to work on mobile and desktop.
Overview over the techniques \ technologies behind the application.
- Single Page application build with Angular
- Styling is done with SCSS and Bulma
- Progressive Web App which uses a service worker for caching and can be installed to the home screen on mobile
- Uses "naive" server side rendering to decrease perceived load time. The index.html file contains the same markup as the loaded SPA will produce. Once it is loaded the static version is hidden and replaced by the dynamic one. Additionally the critical css is inlined in the index.html using critical.
- Deployed on Heroku
- Not a REST Api, instead uses websockets (socket.io) for real time communication. Acts as a relay between all clients of the same session
- Stateless except the connection state of the sockets, all application state is shared between the clients
- No user data is persisted, there is no database involved
- Servers the static assets of the single page application only over https
- The assets are compressed with gzip
www.planning-poker.ch reached a performance score of 100/100 on Lighthouse and AAA on webpagetest.