The challenge
Live events meant code freezes. Anything that did go out during a match needed a manual rollback that took forty minutes to run.
The approach
Parallax put release markers on every player metric and wrote rollback rules for buffering, start time and errors, so a bad change dialled itself back in seconds.
The result
Incidents during the busiest season halved, the freeze was lifted, and the team shipped twice during the most watched night of the year.