It's been a pleasure working as part of the Automation and Tools team at Mozilla this summer (make sure you check Mozilla's great university program).

I worked on a couple of projects, but the main one involved switching a legacy testing infrastructure to structured logs (instead of the previously used mash of formatted strings parsed by regular expressions).

You can watch the presentation to get all the pro-tips to avoid the pitfalls of refactoring continuous integration code (and more!):

(the presentation can also be viewed on [air mozilla](