1. The quality of the coffee and toilet paper you encounter during an interview tells you more than promises about table tennis or fruit baskets.

2. Try to determine who their primary client is: subscribers, app buyers, advertisers, etc. It's a major influence on the company dynamic.

3. Before an interview, you can just say: "I would like to sit down with a PO and run through one backlog feature and one bug, to get a feel for the type of tasks at the company". Such an activity immediately reveals team structure, whether they have product owners & scrum masters, what a sprint looks like, how they prioritize tasks, and how organized/chaotic your work experience will be.

Ok, I'll wait...