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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Implement CIDR firewall matcher
Implement CIDR firewall matcher Firewall Rule Matcher for IPv4 CIDR Rules Context and Assumptions You are to design and implement a firewall rule matc...
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 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 RAG Retrieval for Data Assets
This question evaluates skills in designing hybrid retrieval pipelines over enterprise metadata, including competencies in information retrieval, exac...
Explain ROC-AUC vs PR-AUC tradeoffs
Question You trained a binary classifier that outputs predicted probabilities. Compare ROC-AUC and PR-AUC (the latter usually reported as Average Prec...
Design a Slack-like messaging system
This question evaluates system design and distributed-systems competencies, focusing on real-time messaging architecture, data modeling, scalability, ...
Implement Linear Regression Gradient Descent
This question evaluates understanding of simple linear regression, batch gradient descent, loss function formulation, gradient derivation for model pa...
Design bookstore and chat messaging systems
This question evaluates a candidate's competency in large-scale system design, including distributed systems architecture, data modeling, consistency ...
Describe your background and impact
Walk Me Through Your Background (HR Screen — Software Engineer) Prompt Provide a concise walkthrough of your background focusing on: 1. Most relevant ...
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 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...
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...
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...
Implement an Alternating Tic-Tac-Toe Game
This question evaluates a candidate's ability to implement state management, alternating turn logic, input validation, board representation, game outc...
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:...
Answer behavioral screen questions
Answer behavioral screen questions HR Screen — Behavioral Questions (Software Engineer) Context: You are interviewing for a Software Engineer role in ...
Determine allow/deny for an IP via CIDR rules
This question evaluates understanding of IPv4 addressing, CIDR range matching, rule ordering and precedence, and algorithmic correctness in determinin...
Design KV store with sliding-window QPS metrics
This question evaluates designing an in-memory key–value store with sliding-window throughput metrics, testing competencies in data structures, concur...
Share background, conflicts, and proud project details
Share background, conflicts, and proud project details Behavioral & Leadership HR Screen — Software Engineer Context You are in an HR screen for a Sof...
Optimize a SQL query plan tree
This question evaluates understanding of relational algebra, query optimization techniques, and tree-based plan transformations such as predicate push...