User-lxxa2Jun 23, 2026

Databricks phone screen, moving to onsite

Hack2hire Community · 2026-06-23T06:00:00.025Z

Result: Pending (moving to onsite) Number of Rounds: 1 Databricks phone screen, 45 minutes. Got IP CIDR Firewall, given a set of firewall rules in CIDR notation and an IP address, determine whether the IP is allowed or blocked based on priority ordering. Rules can have overlapping ranges. The core approach is parsing CIDR notation into a subnet mask: convert the IP to a 32-bit integer, create a mask from the prefix length by shifting bits, AND them together to get the network address, then do th...

Interview Experiences

databricks

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Replies (3)

emilywu0526Jun 23, 2026

good luck on the onsite. databricks loops are long but the interviewers are usually reasonable

leilachen97Jun 23, 2026

the trie approach for large rulesets is smart, basically prefix tree on binary IP. did you sketch it out on the board?

arjun.patel1997Jun 23, 2026

explained the concept but didn't have time to code it. they seemed fine with the direction

aaronzhang0812Jun 23, 2026

IPv6 follow-up is such a databricks thing. they love scalability and system extensions