Databricks Coding & Algorithms Interview Questions
Databricks Coding & Algorithms interview questions focus on clean, scalable problem solving under realistic constraints. Expect interviews that often resemble LeetCode-style algorithm problems but with an emphasis on optimizations that matter at scale: time and space complexity, edge cases, and clear, maintainable code. Interviews typically use an online IDE for live coding and are woven into a loop that also assesses system design and collaboration. For candidates targeting data, platform, or ML infrastructure teams, concurrency, streaming, and data-structure tradeoffs commonly surface alongside pure algorithmic challenges. For effective interview preparation, prioritize deliberate practice of medium-to-hard algorithm problems, timed mock interviews, and explaining complexity tradeoffs aloud. Solidify one primary programming language so you can write correct, testable code quickly, and revisit concurrency primitives and common distributed-systems patterns if your role touches platform work. Practice communicating assumptions, iterating from a brute-force approach to optimized solutions, and writing concise test cases. This combination of technical depth, clear communication, and systems awareness is what Databricks typically evaluates.

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Find Path Between Fibonacci Tree Nodes
This question evaluates a candidate's ability to reason about recursive tree structures, map preorder indices to positions in a recursively defined Fi...
Implement firewall matching with CIDR rules
Implement a simple IPv4 firewall rule matcher. Problem You are given an ordered list of firewall rules. Each rule has: - an action: ALLOW or DENY - a ...
Design an IP filter using CIDR rules
Explain CIDR notation with a couple of concrete examples. Show how to convert a prefix like 192.168.0.0/16 into an inclusive 32-bit integer range and ...
Design KV store with sliding-window average QPS
Problem Design an in-memory key–value store that supports mutation operations and can report the average QPS (queries per second) over a recent time w...
Evaluate ACL rules for IP and CIDR
This question evaluates a candidate's competency in IP address and CIDR arithmetic, bitwise reasoning, and algorithm design within the Coding & Algori...
Check Whether Two Strings Are Anagrams
Problem Implement are_anagrams(a, b). Return true exactly when a and b contain the same lowercase English letters with the same multiplicities, possib...
Find k customers with least revenue
Problem You are given a list of purchase events. Each event contains: - customer_id (string or int) - amount (integer, may be 0; assume non-negative u...
Minimize run-length encoded length with deletions
This question evaluates proficiency in string manipulation, run-length encoding concepts, and dynamic programming-based optimization under deletion co...
Implement an Alternating Tic-Tac-Toe Game
This question evaluates a candidate's ability to implement state management, alternating turn logic, input validation, board representation, game outc...
Find first CIDR block covering IP
You are given: - A single IPv4 address as a string, e.g. "192.168.1.5". - A list of CIDR blocks (IPv4), each as a string in the form "a.b.c.d/x", wher...
Find optimal commute mode in a city graph
You are designing a route planner that suggests the best way to commute between two points in a city using different transportation modes. The city is...
Find the Best Commute Mode
This question evaluates competency in grid-based pathfinding, graph traversal, and multi-criteria optimization of path time and cost within the Coding...
Partition a Target String by Source Substrings
This question evaluates understanding of string algorithms and optimal partitioning, specifically substring matching and minimizing the number of cont...
Implement Snapshot Iterator Without Order Guarantees
Design and implement a mutable collection that supports snapshot iteration. The collection stores unique values and supports the following operations:...
Check if CIDR is fully canceled by rules
You are given: - A target CIDR block T as a string, e.g. "10.0.0.0/16". - A list of rule CIDR blocks. Each rule has: - A type: either "allow" or "de...
Delete a Character From Cover
This question evaluates proficiency in string manipulation, interval arithmetic, and data-structure updates with attention to index mapping and edge-c...
Compute 5-minute rolling average load
This question evaluates understanding of sliding-window aggregation and efficient data-structure design for time-series event streams, focusing on com...
Track Customer Revenue and Referral Revenue
Track Customer Revenue and Referral Revenue Problem Implement a top-level function that processes an in-memory customer revenue tracker through a lite...
Design In-Memory QPS Counter
Implement an in-memory traffic counter. You need to support two operations for each logical key, such as an endpoint, customer, or service name: - rec...
Implement Random Connectivity and Grid Routing
This entry contains two independent coding problems. Problem 1: Uniformly connect node groups You are given k non-empty, disjoint groups of unique nod...