Squash games are played daily. The system is designed to store the game log data. The aim here is to let users enter match logs in the quickest possible time, after they play their games. Thousands of log data records are expected to be uploaded daily. The site can be viewed on iPhone, iPad, Desktop browser, Android browser and is hosted as static html files. Ajax calls are used for dynamic functionality and asynchronous updates.
A very simple login form is required to start with. If user does not exists, then the login form performs the role of registration.
Once a user logs in, he can enter the logs of the game that he played. Extensive client side validations are implemented to make the form extremely simple, for the player to use.
You can read more about the validations implemented here.
Same validations are implemented on server side, to ensure irrelevant data is not pushed through. XSS and CSRF security is implemented.
For speed of response, all master data is saved in json format on Amazon S3 files in various locations across the globe. These data files are loaded as static content during log entry. Amazon DynamoDB is implemented for fast access to log data.
You can read more about the amazon implementation here.