I had a great experience interviewing at Datadog. The interviews involved a typical mix of questions:

• A coding interview with a focus on algorithmic complexity knowledge
• A design interview
• Multiple interviews focusing on my experience and knowledge

I was given a packet of information before the interviews to help me prepare, so I knew what to expect going in. I found the interviewers polite and professional, and I thought the questions were fair given the position I was applying for.

The technical question asked me to implement a simple multiple-producer single-consumer event queue, merging events coming from different sources.

I was asked to handle various edge cases, and we discussed the computational complexity of the algorithms I used extensively.

We used JavaScript, but I was told that any language I was familiar with would be fine.