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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Convert an IP range to minimal CIDRs
This question evaluates understanding of IPv4 address encoding, binary and bitwise operations, and optimal interval covering for expressing consecutiv...
Implement a Lazy Array
This question evaluates understanding of lazy evaluation and deferred computation, implementation of iterator/generator-like abstractions, and the abi...
Implement lazy array and KV store
This question evaluates understanding of lazy evaluation and functional transformation chaining for a LazyArray alongside in-memory data structure des...
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 ...
Relate coefficients under linear feature transformation
This question evaluates understanding of linear regression parameter relationships under linear feature transformations, model equivalence and identif...
Relate coefficients under linear feature transformation
Suppose you are fitting a linear regression model and you consider two different feature parameterizations. Original features: x1, x2. Transformed fea...
Implement a sliding-window hit counter
Implement a hit counter that supports recordHit(timestamp) and getHits(pastSeconds). Use a fixed-size array to maintain a sliding time window (e.g., l...
Design BFS to detect forced win in Tic-Tac-Toe
You are given an n×n Tic-Tac-Toe–like board and a target k (1 ≤ k ≤ n). From the current board state and the player to move, design an algorithm to de...
Explain Linear Regression Feature Transformation Equivalence
Explain Linear Regression Feature Transformation Equivalence Linear Regression Feature Representations and High-Dimensional Modelling Context You are ...
IPv4 CIDR Range Membership Queries
This question evaluates a candidate's ability to design an efficient longest-prefix-match lookup structure for IP address ranges, a core networking an...
Optimal Commute: Nearest Transit Distance in a City Grid
This question evaluates a candidate's ability to apply multi-source breadth-first search to a grid-based shortest-path problem. It tests graph travers...
Choose the Best Travel Mode
Solve a grid-based pathfinding problem where a traveler must choose the transportation mode with the lowest travel time and cost tie-breakers. The que...
Implement a Snapshot Set Iterator
This question evaluates data structure design, versioning, and iterator consistency concepts within the Coding & Algorithms domain, focusing on implem...
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...
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...
Find Fastest Commute Mode
This question evaluates graph traversal and shortest-path reasoning on a constrained 2D grid, including modeling movement rules per transportation mod...
Solve Grid Path and Graph Sampling
This question evaluates graph algorithms and probabilistic/combinatorial reasoning, covering multi-criteria shortest-path optimization (minimizing tra...
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...
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...
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...