Databricks Interview Questions
Practice 131 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.
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Build a Durable Key-Value Cache
This question evaluates understanding of data durability and recovery mechanisms, including write-ahead logging, in-memory caching, operation ordering...
Design a Write-Ahead Log Writer with Batch Writes
Design a Write-Ahead Log Writer with Batch Writes Design the low-level behavior of a write-ahead log writer that accepts records from concurrent calle...
Design a Distributed File System
This question evaluates design skills for large-scale distributed storage systems, testing understanding of distributed systems principles such as met...
Design a Bookstore Pricing API with Batch Fetches
Design a Bookstore Pricing API with Batch Fetches In a high-level system-design discussion, design the HTTP interface and supporting service for fetch...
Explain Your Motivation, Fit, and Company Understanding
Prepare concise answers for a recruiter screen for a senior forward-deployed engineering role. Your answers must be specific to your real experience a...
Present a Technical Project Under Active Follow-Up
Present a Technical Project Under Active Follow-Up Give a senior-level deep dive into one technical project while the interviewer asks detailed questi...
Design Messaging With Message Deletion
Design a real-time messaging application with channels or conversations, message history, and message deletion. Focus especially on how deletion behav...
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 Slack-Like Messaging System
This question evaluates a candidate's ability to architect a real-time team messaging platform, testing competencies in distributed systems, data mode...
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...
Design a Hierarchical File System
This question evaluates understanding of scalable distributed storage and namespace architecture, covering metadata versus data separation, inode-like...
Implement Resilient Autocomplete Data Fetching
Implement the data-fetching logic for an autocomplete input whose UI is already provided. The component requests suggestions for the current query and...
Find a Path Between Nodes in a Fibonacci Tree
Practice a Databricks coding interview problem focused on find a path between nodes in a fibonacci tree. The prompt emphasizes edge cases, clean imple...
Design a stock order manager
This question evaluates a candidate's ability to model and manage order lifecycle and state reconciliation, along with understanding of distributed-sy...
Design an Online Bookstore
This question evaluates a candidate's ability to design a scalable, fault-tolerant online bookstore by addressing service decomposition, functional re...
Implement Fixed-Window Get and Put QPS Tracking
Implement Fixed-Window Get and Put QPS Tracking Design a key-value service with put, get, and load-reporting APIs. Track get and put calls separately ...
Design a Visa-like payment processing system
This question evaluates a candidate's ability to design a secure, low-latency card payment processing network, testing knowledge of distributed system...
Design a key-value store
System Design: Durable Key–Value Store Design a single-node, embeddable key–value store library with a simple API that must remain correct and durable...
Design a KV store with QPS API
This question evaluates a candidate's ability to design scalable, highly available key-value storage systems and to integrate real-time metrics report...
Design a Cache with Hit Counts
This question evaluates a candidate's competence in system design, data structures, concurrency, and observability by requiring a key-value cache that...