Databricks Interview Questions
Practice 100 real Databricks interview questions for 2026. Covers all top categories — Coding & Algorithms, System Design, Behavioral & Leadership, Statistics & Math, Software Engineering Fundamentals — across Software Engineer, Data Scientist, Machine Learning Engineer, and Data Engineer roles. Real questions from actual interviews with detailed solutions; this collection explains what’s distinctive about Databricks interviews, what interviewers evaluate, what to expect in each round, and how to structure your interview preparation. Expect a heavy software-engineering tilt: Software Engineer rounds repeatedly probe storage and data-platform design (hierarchical file systems, cache designs, lakehouse tradeoffs), distributed job scheduling and dependency-aware pipelines, concurrency and multithreaded systems (synchronous log writers, thread-safe KV stores), and performance-focused algorithmic problems and query optimizations. Data Scientist questions emphasize regression assumptions and coefficient transformations, similarity search across datasets, hypothesis testing and metric tradeoffs (ROC-AUC vs PR-AUC), and product-analytics counting problems. Machine Learning Engineer prompts focus on implementing algorithms (gradient descent, lazy arrays) and safety/OOM detection for models. Data Engineer coverage targets data-quality diagnostics, Spark/partitioning and pipeline performance. To prepare, prioritize timed coding practice, system-design sketches that show tradeoffs for data systems, concise statistics explanations, and polished STAR stories for behavioral rounds.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Build a Durable Key-Value Cache
Design and implement an in-memory key-value cache backed by a write-ahead log (WAL) so that the cache survives process crashes. The implementation run...
Design a Book Price Aggregator
Design a book purchasing marketplace where your service acts as an intermediary between customers and hundreds of partner bookstores. Your service hol...
Design a Slack-Like Messaging System
Design a Slack-like team messaging system — a real-time collaboration platform organized around workspaces and channels. The system should let users: ...
Design a Distributed File System
Design a distributed file system for a cloud service — a POSIX-like storage layer that internal applications and external customers use to store and r...
Design a Hierarchical File System
Design a hierarchical file system service from scratch, without relying on an existing blob store or distributed object storage (you must store the ra...
Design a stock order manager
Design an order management service (OMS) for stock buy and sell requests. The system does not match trades itself. Instead, it integrates with a singl...
Design RAG Retrieval for Data Assets
Design the retrieval component for an internal AI coding/analytics assistant. When a user asks a data-related question, the assistant must identify th...
Design a single-node persistent in-memory cache
Scenario Design a single-machine in-memory cache used by a web service to serve concurrent read and write requests. This is a deliberately low-level s...
Design a multi-threaded synchronous log writer
Problem Design a log(message) component that is called from many application threads concurrently and appends each message to a single log file on dis...
Implement a Snapshot Set Iterator
Design and implement a set data structure that supports snapshot iteration. The set stores unique values. It must support the following operations: - ...
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...
Implement an Alternating Tic-Tac-Toe Game
Implement a Tic-Tac-Toe game for two players. Requirements: 1. The board is a standard 3 x 3 grid. 2. Players do not need to be passed into each move....
Design a Cache with Hit Counts
Design a key-value cache that supports get(key), put(key, value), and delete(key). In addition, the cache must track how many successful reads each ke...
Find First Anagram Occurrence
Given two strings text and pattern, return the starting index of the first substring in text that is an anagram of pattern. If no such substring exist...
Implement a Snapshot Set Iterator
Design and implement a mutable SnapshotSet data structure. The set stores unique keys and supports normal set operations, plus snapshot iterators. Imp...
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...
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-...
Design an Online Bookstore
Design an online bookstore platform. Customers should be able to search for books, view book details, add items to a cart, place orders, pay, and trac...
Design a multithreaded event logger
Design a multithreaded in-memory event logger for a server application. Requirements: - Many worker threads running in the process need to log events ...
Design Harmful Content Detection
Design an end-to-end machine learning system to detect harmful user-generated content on a large online platform. Assume the platform accepts text and...