Databricks Machine Learning Interview Questions
These are the 9 Databricks machine learning interview questions AceOffer has reconstructed from candidate reports, sorted by how often each was reported. Durable / Persistent Event / Data Writer leads at 8×. Every question shows when it was last reported; the catalog refreshes monthly.
Key facts
- •9 distinct machine learning questions indexed
- •26 candidate reports across those questions
- •Most reported: Durable / Persistent Event / Data Writer — 8× (last seen July 2026)
- •Refreshed monthly · last updated September 2026
Which Databricks rounds ask machine learning questions?
The Databricks rounds below are where these questions come up. Counts are distinct questions, not times asked.
Most reported: Durable / Persistent Event / Data Writer — 8×
Which Databricks machine learning questions get asked most?
Sorted by candidate-report frequency. Click any question for the full breakdown.
| Question | Round | Reported | Last seen |
|---|---|---|---|
| Durable / Persistent Event / Data Writer Design and implement a thread-safe, durable event writer for a single-server application. Thousands of application threads share a single instance of a… | Tech Deep Dive | 8× | July 2026 |
| Durable / Persistent KV Store Design and implement a durable (persistent) key-value store that survives process crashes and can recover its state on restart. The store must… | Tech Deep Dive | 7× | January 2026 |
| Harmful Content Detection (LLM/ML) Design an end-to-end ML system to detect harmful content. In LLM-specific variants, the focus is on detecting harmful content generated by or… | Tech Deep Dive | 4× | August 2026 |
| Linear Regression / Gradient Descent from Scratch Implement simple linear regression using gradient descent from scratch. Given paired data (X, Y), write code to learn the regression weights by… | Tech Deep Dive | 2× | April 2026 |
| Multi-threaded Recursive Data Deletion with Dependencies Given a data entity that has recursive dependencies (e.g., a user deletes a post, which must also delete all comments on that… | Tech Deep Dive | 1× | June 2025 |
| Cache Block System Programming A system programming problem involving cache blocks with synchronization and concurrency challenges. Candidates must design or implement a cache block system that… | Tech Deep Dive | 1× | July 2026 |
| Frontend System Design: Autocomplete Design and implement an autocomplete system from the frontend perspective. The UI is already provided; you need to write the data-fetching logic.… | Tech Deep Dive | 1× | July 2026 |
| Python Authentication Class Implementation Implement a Python authentication class that supports core authentication functionality including password management (e.g., setting, validating, and updating passwords) and token handling… | Tech Deep Dive | 1× | March 2025 |
| HashSet Implementation with Optimization Implement a HashSet from scratch with custom add and delete logic. Beyond the basic implementation, an optimization is required: separately storing add… | Tech Deep Dive | 1× | October 2025 |
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