A recruiter reached out to me, and I started the process.

The interviews were easy-ish, and the practical coding was quite good, in my opinion. However, it was in a different language than I had confirmed with the recruiter for the interview process.

Regardless of that, they are professional ghosters. After a few rounds of interviews, they not only don't give feedback, but they don't even send the "unfortunately" email. I even directly emailed and asked for an update, but to no avail.

This is horrible behavior from the recruiter, which is apparently normal now. There's no decency.

Design a system that tags a payment as fraudulent or not, based on open investigations.