Databricks Interview Questions
Practice the exact questions companies are asking right now.
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Design a single-node persistent in-memory cache
Scenario Design a single-machine cache used by a web service to handle read/write requests. The cache should: - Store key/value pairs in memory (fast ...
Minimize run-length encoded length with deletions
Problem You are given a string s (uppercase English letters) and an integer k. You may delete at most k characters from s. After deletions, you compre...
Find path in implicit Fibonacci tree
You are given a special family of binary trees called Fibonacci trees. The k‑th order Fibonacci tree T(k) is defined recursively: - T(1) is a single n...
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...
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...
Design a KV store with QPS API
Design a key-value (KV) store that supports basic read/write operations and also exposes an API to report QPS (queries per second). Functional require...
Design a Visa-like payment processing system
System Design Prompt Design a card payment processing system similar to a Visa/Mastercard network. The system should support: - Card-present and card-...
Determine allow/deny for an IP via CIDR rules
Problem You are implementing a simple IPv4 firewall. You are given an ordered list of rules. Each rule has: - an action: either ALLOW or DENY - a CIDR...
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...
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...
Compute 5-minute rolling average load
You are building a monitoring component for a key–value (KV) store. Each request contributes 1 unit of load at its request time. Design a data structu...
Design a multi-threaded synchronous log writer
Problem Design a log writer component that is called from multiple application threads and writes logs to a single file on disk. Requirements: - Calle...
Optimize least-k revenue queries for read/write load
Follow-up Scenario Now assume revenue is not provided as a flat list of events, but may be nested, for example: - Each customer has many orders, and e...
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...
Implement a rate-limited hit counter
You are designing a hit counter that records the number of hits received in the past 5 minutes. Implement a class HitCounter with the following method...
Design Tic-Tac-Toe and QPS data structures
You are given two independent coding problems that focus on data structure and API design. --- Problem 1: Generalized Tic-Tac-Toe Game with Simple AI ...
Design CRUD APIs with async jobs
Scenario Design a small backend service that manages a core entity with CRUD operations and also supports an asynchronous background job triggered by ...
Design a durable key-value store
System Design: Durable Key–Value Store Context Design a single-node, embeddable key–value store library with a simple API that must remain correct and...
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...
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...