Shipped a product
Conducted an A/B test
Shipped the Unpinning Accepted Answers experiment. This was an A/B test across all Stack Overflow visitors to compare the behavior between when we pin or unpin the accepted answer.

We looked at how users copied and voted in these two scenarios. We were looking to see no negative behavior emerge to confirm that we weren't causing harm.

I was involved in developing the ability to measure some of these metrics as well as helping to set up the experiment with our internal A/B testing tool.