Short essays

North Star Metrics Lie

Tracking the North Star metric is like looking through a telescope. You clearly see your goal but if you do it too long you may miss anything that happens at your feet.

A/B testing

Aggregation bias in A/B tests

A Data Scientist tries to run an A/B test not considering Aggregation Bias. You won't believe what happens next!


How to prioritise everything in Data Science

Three simple rules which can help you to triage your backlog in a right way.


Knowledge is a jigsaw puzzle

A few thoughts on learning process and knowledge