FoxyLad 
#Appengine After 6 months work, we're switching on a major upgrade to School Interviews one hour from now.
With over 2 million users, I'm rather nervous.
For the tech heads, #Webapp2 to #Flask and #Python 2.7 to 3.9. We've discovered #Appengine handles python 3 very differently to python 2, even if both are standard environment.
It went well! A few bugs cropped up, but they were quickly squashed. 24 hours on everything looks stable.
Sam Minnée@foxylad well done! Always a nerve-wracking moment, releasing 6 months work