I applied by referral and advanced to the first coding challenge. The invitation was vague and similar to regular SWE coding callenges, so I did lots of DSA on leetcode to prepare. When I took the challenge, there were questions about handing json files and writing SQL queries - which I had no prior experience with. Did my best, followed up with recruiter after to say that I didn't know anything about SQL or json but that I hoped I had at least demonstrated quick thinking...no response from the recruiter, and got an automated rejection email the next day.