Nextdoor onsite

Hello all, I have Nextdoor Sr. SWE onsite coming up in 2 weeks, one of the round says *backend* coding? Is that a regular DS and algo round, or is it more inline of build something or OOP type round? The recruiter said it's just coding and was vague. Anyone that went through this and Nextdoor peeps what to expect here? Thanks. #onsite #nextdoor #interview #swe