Just a quick note, I went over the code base for the new covid app. There's some issues with it e.g. lack of tests and some code quality issues that you'd probably find in any app but from a data privacy and security point of view it looks good.
Honestly we should make open sourcing of new government apps mandatory, it's amazing to be able to audit something like this and trust that it's doing what they say it's doing. I really don't think I could have used something like this without this level of transparency.
Highly recommend anyone who hasn't already download the app, the more people who use it the better it will work.