The first round of online assessments were normal hacker rank problems that weren't too difficult in hindsight. It's important to know your data structures, like trees etc. I found it difficult at the time due to it being my first encounter with data structure questions but now that I've learnt it in uni, it should be good.

Really hard interview process that isn't just leetcode but tests your true understanding and passion for software engineering, but thats expected with companies that are going to pay you 60k + for the summer