Wealthfront SDE Onsite Interview Experience for Experienced Engineer

I couldn't find any recent interview experiences for this company on the forum; most of the SDE interview experiences I saw were from before 2018. The hiring manager contacted me on LinkedIn. First, t

I couldn't find any recent interview experiences for this company on the forum; most of the SDE interview experiences I saw were from before 2018. The hiring manager contacted me on LinkedIn. First, there was a take-home challenge that took me about six hours, followed by an in-person onsite interview. There were two coding rounds and three 1-on-1 rounds. The coding questions weren't difficult; they were all very basic CS fundamentals. I have five years of work experience, and these questions were similar to those I encountered as a new grad. The next day, they told me I failed. I suspect it was because my Java proficiency wasn't high enough. The interview only allowed Java, and I usually use C++ for work; my Java level is only what I was at in school. However, I felt the interviewer wanted me to use Java 8. Also, the hiring manager said they wouldn't sponsor H1 visas, which I don't need, but the overall work atmosphere felt like that of a local ABC (American-born Chinese) group.