It feels like favor has hired some FAANG engineers and is trying to adopt a FAANG culture.
Here is the problem: The reason FAANG has 4 different coding exercises is because you don't want base performance on one, potentially difficult interview problem, meanwhile you want candidates to shine given the opportunity.
This was the problem with their technical interview. It was essentially a leetcode medium daily challenge that was full of people complaining how difficult the problem surprisingly was. (Probably is more in line with a "hard")
Implement a "food rating" system. (Leetcode 2353)
At first glance, it doesn't seem that hard. It was actually deceptively hard to do with OOP (would have been simply to do with a SQL DB).
Next, the question was poorly worded. It wasn't clear how the object would be initialized. It wasn't clear how test cases would be performed. So I spent a good chunk of time just trying to understand how the interface was meant to be consumed. (The leetcode problem makes it more clear).
This is a fun leetcode problem. It's a terrifying interview question for a 60 minute interview.
System design was completely open ended, but I don't even know if I did well in it or not. I know I did poorly in the coding exercise because I knew my solution was very inefficient.
Tip: If you need to solve these sort of problems, just work for FAANG. The interview process is probably easier, and you'll be compensated better than Favor.