How Databricks Interviews in 2026: Process, Questions & What They Score

1. 01

   Design a Hit Counter / rate limiter that tracks requests over a rolling time window

   Tests rolling-window counting: bucketed timestamps or a deque to expire old events efficiently.

2. 02

   Design a variable-sized Tic-Tac-Toe game (win-condition checking as board size grows)

   Object-oriented design plus an O(1)-per-move win check using row, column, and diagonal counters.

3. 03

   Implement atoi / String-to-Integer conversion with edge-case handling

   Edge-case discipline: whitespace, signs, overflow clamping, and invalid input handling.

4. 04

   House Robber (and the circular-houses follow-up, House Robber II)

   Tests 1D DP with a take-or-skip recurrence, then adapting it to the circular constraint.

5. 05

   Convert an IP address to CIDR notation (or the reverse) given a range of addresses; a related variant asks you to design an IP-based allow/deny firewall using ordered CIDR rules

   Tests bit manipulation on IP addresses: aligning block boundaries to emit minimal CIDR ranges.

6. 06

   Weighted-paths / graph optimization problem (find optimal path given weighted edges)

   Graph optimization: model the grid or network as weighted edges and run Dijkstra-style search.

7. 07

   Given an array of string 'commands', compute the resulting normalized file path

   Tests stack-based parsing: process path commands and collapse dot and dot-dot segments.

8. 08

   Graph search and array/string/hash-map problems drawn from LeetCode medium-to-hard difficulty

   Expect graph search plus array, string, and hash-map problems at LeetCode medium-hard difficulty.

Reported problems, listed so you know what to expect. Practice them in your own editor or on the platform you prefer; SupaCV's practice mode coaches how you talk through them.

1. 01

   Implement an efficient logger/queue that processes messages from multiple producer threads safely

   Concurrency design: a thread-safe queue that keeps multiple producers from corrupting or blocking each other.

2. 02

   Design a thread-safe rate limiter or counter shared across concurrent requests

   Tests shared-state synchronization: atomic counters or locks guarding a rate window under concurrency.

3. 03

   Implement a producer-consumer pattern with bounded buffer and proper synchronization

   Classic synchronization: bounded buffer with condition variables or semaphores, avoiding deadlock.

4. 04

   Explain and resolve race conditions in a given snippet of multithreaded code

   Code-reading exercise: spot the data race and fix it with proper synchronization or immutability.

5. 05

   Discuss trade-offs between locks, atomics, and lock-free structures for a shared-state problem (e.g., why isn't a plain HashMap thread-safe, and how does a ConcurrentHashMap solve it)

   Concurrency theory: why HashMap breaks under threads and how ConcurrentHashMap's striping or CAS fixes it.

Reported problems, listed so you know what to expect. Practice them in your own editor or on the platform you prefer; SupaCV's practice mode coaches how you talk through them.

1. 01

   Design a service that finds customers the cheapest copy of a book across multiple distributors (search + purchase flow)

   System design: aggregating distributor inventories with search, caching, and a reliable purchase flow.

2. 02

   Design a real-time data ingestion pipeline (e.g., streaming events into a lakehouse)

   System design: they probe stream transport, schema handling, exactly-once semantics, and lakehouse landing.

3. 03

   Design a Spark job that processes terabytes of data every 10 minutes on Databricks: discuss partitioning, shuffles, and fault tolerance

   Tests Spark internals: partitioning strategy, shuffle cost, and fault tolerance at terabyte scale.

4. 04

   Design core components of a system like Delta Lake (transaction log, ACID guarantees, schema evolution)

   Tests storage-engine thinking: transaction logs, ACID over object storage, and schema evolution.

5. 05

   Design a distributed file system, or a data lake supporting both streaming and batch writes

   System design: metadata service, chunk placement, replication, and mixed streaming and batch writes.

6. 06

   Given a single component (e.g., a metadata cache or query scheduler), go deep on concurrency, data structures, and pseudocode rather than whiteboard architecture boxes

   Depth-first design round: concurrency, data structures, and pseudocode for one component, not box diagrams.

Reported problems, listed so you know what to expect. Practice them in your own editor or on the platform you prefer; SupaCV's practice mode coaches how you talk through them.

1. 01

   Design an end-to-end ML pipeline that handles large datasets and automates training and deployment

   ML systems design: data volume handling, automated training, deployment, and monitoring stages.

2. 02

   How do you know when a deployed model needs to be refreshed or retrained? How do you detect drift?

   MLOps knowledge: drift signals, monitoring metrics, and retraining triggers for deployed models.

3. 03

   Explain the difference between classification and regression, and when you'd choose each

   ML fundamentals: matching problem type to output form and appropriate loss and metrics.

4. 04

   Walk through diagnosing a Spark job with skewed partitions or a slow shuffle stage

   Spark troubleshooting: reading the UI for skew, then salting keys or tuning partitions and joins.

5. 05

   Explain the Medallion (bronze/silver/gold) architecture and why you'd structure a pipeline that way

   Data-engineering pattern knowledge: bronze/silver/gold layering and the quality guarantees each adds.

6. 06

   When would you use Spark SQL vs. the DataFrame API for a given transformation?

   Tests API judgment: when SQL expressiveness versus programmatic DataFrame logic fits a transformation.

7. 07

   Explain ROC vs. precision-recall trade-offs, or diagnose issues in a linear regression (data-scientist-leaning loops)

   ML evaluation: ROC versus precision-recall under class imbalance, or diagnosing regression pathologies.

Reported problems, listed so you know what to expect. Practice them in your own editor or on the platform you prefer; SupaCV's practice mode coaches how you talk through them.

1. 01

   Tell me about a time you had a conflict with a coworker and how you resolved it

2. 02

   Describe a project you're most proud of and why

3. 03

   Tell me about a time you changed your mind after seeing new data (maps well to 'truth seeking')

4. 04

   Tell me about a time you raised the bar on quality or pushed for a higher standard

5. 05

   Tell me about a time you had to solve a problem without all the necessary information (ambiguity)

6. 06

   Tell me about a time you took initiative on a problem instead of waiting for someone else to address it

7. 07

   Tell me about a time you received difficult feedback from a manager and how you responded

8. 08

   Why Databricks? What about this specific team/role interests you?