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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Implement streaming RLE and bit-packed codec
You are implementing a simple compression scheme for sequences of 32‑bit signed integers. The codec should support two encoding strategies: 1. Run‑Len...
Implement run-length encoding and decoding
You are given a string consisting of lowercase English letters. You need to implement run-length encoding (RLE) and its corresponding decoding. 1. Enc...
Evaluate ACL rules for IP and CIDR
Problem You are implementing an IPv4 access-control list (ACL). The ACL contains ordered rules; each rule has: - action: either ALLOW or DENY - cidr: ...
Solve graph path, interval deletion, and robbery
Solve graph path, interval deletion, and robbery Part A — Optimal path with transport modes: You are given a directed weighted graph of a city. Each e...
Find Path Between Fibonacci Tree Nodes
You are given a special family of binary trees called Fibonacci trees. Define the tree T(k) recursively: - T(1) is a single node. - T(2) is a single n...
Choose fastest transportation mode on city grid
You live in a city modeled as a 2D grid. Each cell is either: - A transportation mode 1..4 where: - 1 = Walk, 2 = Bike, 3 = Car, 4 = Train - S = sou...
Find all anagram start indices
Problem Given two strings s and p, return all starting indices of substrings in s that are anagrams (permutations) of p. Input - s: string - p: string...
Implement a Tic-Tac-Toe game API
Problem Design and implement a Tic-Tac-Toe game class that supports playing moves on an n x n board. Requirements - Two players, represented by intege...
Implement a snapshotable set with iterators
Implement a SnapshotSet data structure with the following API: add(x), remove(x), contains(x), snapshot() -> sid, and iterate(sid) -> iterator over th...
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 ...
Convert an IP range to minimal CIDRs
Problem Given a starting IPv4 address ip and a non-negative integer n, output the smallest possible list of CIDR blocks that exactly covers n consecut...
Implement a Lazy Array
Implement a lazily evaluated array abstraction. The object should wrap an underlying sequence and support chained transformations such as map and filt...
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:...
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...
Find Fastest Commute Mode
You are given a 2D city grid containing: - S: starting location - D: destination - X: blocked cell that cannot be entered - 1, 2, 3, 4: cells usable b...
Find path between nodes in Fibonacci tree
You are given a recursively defined Fibonacci tree F(k): - F(0) is a single node. - F(1) is a single node. - For k >= 2, F(k) consists of: - a root ...
Design a rolling event tracker with ranges
Design a rolling event tracker that supports time-based queries. Implement a data structure with: ( 1) record(timestamp): record one event at integer ...
Implement lazy array and KV store
You are asked two coding problems in the same interview round: 1. Implement a lazy array abstraction - Create a LazyArray<T> that wraps an input li...
Find top-5 most similar rows across datasets
You are given two datasets with the same feature columns: - source (rows you want to match): - source_id (STRING/INT) - f1...fk (NUMERIC; may cont...
Implement RLE and bit-packing compression
You are asked to implement two related compression/decompression schemes: Run-Length Encoding (RLE) and bit-packing. --- Part 1 — Run-Length Encoding ...