Got a Karat interview invitation after talking to a recruiter at a career fair, with 3 space/time complexity questions and 3 coding questions. After completing it (finished 2/3 of the coding problem), got an email inviting me to a 2-day onsite in Houston, TX. The first day is dinner and networking. The second day is the onsite interview (morning or afternoon). You would have to give a 7-minute presentation along with other applicants (they do it in 5-person groups), then 2 rounds of 45-minute technical interviews and 1 round of HackerRank. Results will be out 2-4 weeks, I haven't heard back yet.