Datadog

• Product built by engineers, for engineers (you actually work on something that directly matters to you).
• Very fast-growing company with tons of challenges and interesting engineering problems to work on (there's no running out of things to do, so there's no battle over who works on interesting projects).
• Direct impact of your day-to-day on the product and customers.
• Very good culture (New York office) and social interactions (people hanging out after work, people not acting as strangers in the elevator or corridors).
• PTO is actually respected (talking about the engineering side mostly), as there's a strong French influence and they are not worried about taking a lot of vacation (20-30 days is common).

Management is young, as early employees got promoted while the company was growing, but external recruiting is picking up too.

I would say lower than average diversity in engineering compared to other tech companies.