Rokt Software Engineer Interview Questions

I applied to rokt in the month of early october for the role of Software engineer - Build and Release Infrastructure. After giving the OA, I recieved a mail from the recruiter informing about the next

I have an onsite interview at rokt coming up (nyc), which should include a behavioral, system design and group bar raiser interview. Has anyone done it recently and if so, what should I expect ?

LeetCode #20: Valid Parentheses. Difficulty: Easy. Topics: String, Stack. Asked at Rokt in the last 6 months.

LeetCode #10: Regular Expression Matching. Difficulty: Hard. Topics: String, Dynamic Programming, Recursion. Asked at Rokt in the last 6 months.

LeetCode #227: Basic Calculator II. Difficulty: Medium. Topics: Math, String, Stack. Asked at Rokt in the last 6 months.