What are the happiest jobs in tech?

What I found interesting about this article was that data scientist/machine learning specialist was in the top 3 happiest jobs whereas business/data analyst was dead last. As the article notes there is a lot of overlap. Working with data scientists, I found that many thought they would be doing applied ml and ended up doing mostly data analysis.

Since the role of a data scientist varies dramatically based on the organization and even the needs of a team, it seems like a job with a very broad spectrum of experiences and satisfaction.