Lately, I did my phone screen interview with a Karat engineer.

Interview is over call over Karat website and coding is on the Karat Studio where there is an option to select your programming language, auto-complete feature and nice colored editor.
Also, you run your code as many times as you want and actually show the correctness of your code by printing to console.

Interviewer initially introduces itself and talks about the process you are going through. Overall, Karat Interview structure is:

1. Your background (1-2 mins)
2. Simple questions about complexity analysis and data structures. (10 mins)
3. Technical algorithm question/s. The number of questions you get depend on your performance. I got two questions, last one being an extension of the first. (45 mins)

Questions were medium LC level graph questions.
Completeness is more important than optimality.

There is an option to reschedule your Karat interview within 24 hours after your interview without a punishment if things go wrong.

Response time of Palantir is very short. (resulted within a day)

-------- [update] ----------------------------------

There was no next round guys. I got an email that I passed the interview, received a briefing about upcoming on-site interviews. Then, recruiter did not continue with the application, left my emails about my status and about on-site date planning unaswered.

I did not pursue much after such unresponsiveness.