Databricks
Unified analytics platform built on Apache Spark for data engineering and ML.
4 Rounds
~21 Days
Hard
The Interview Loop
Recruiter Screen (30 min)
Standard fit check, behavioral questions, and resume overview.
Technical Loop (3-4 Rounds)
Deep dive into domain knowledge, coding, and system design.
Interview Question Bank
Machine Learning Engineer
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Coding
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medium
Implement a LazyArray class in Python that takes an array of integers. It should support two operations: map(function) which applies a function to all elements, and indexOf(value) which returns the index of the first occurrence of the value. The map operation must be lazy (deferred execution) and optimized so that indexOf does not compute unnecessary elements.
#Object-Oriented Design
#Lazy Evaluation
#Arrays
Machine Learning Engineer
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Coding
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hard
Given a list of tasks with dependencies (represented as a directed graph) and the execution time for each task, write a function to calculate the minimum time required to complete all tasks assuming you have infinite parallel workers.
#Graphs
#Topological Sort
#Dynamic Programming
Machine Learning Engineer
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Coding
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medium
Given two sparse matrices A and B represented as lists of non-zero elements (row, col, value), write a function to compute their product. How would you optimize this for a distributed environment?
#Math
#Hash Maps
#Distributed Computing
Machine Learning Engineer
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Coding
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medium
Given a stream of user activity logs (timestamp, user_id, action), write a function to find the longest continuous session for each user. A session ends if there is a gap of more than 30 minutes between actions.
#Sliding Window
#Hash Maps
#Sorting
Machine Learning Engineer
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Coding
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medium
You are given a list of intervals representing compute jobs on a cluster [start, end] and an associated CPU core requirement for each job. Write a function to determine the maximum number of CPU cores used at any point in time.
#Sweep Line
#Intervals
#Sorting
Machine Learning Engineer
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Coding
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medium
Implement a thread-safe Rate Limiter class for an API. It should support a method `is_allowed(client_id)` which returns True if the client has made fewer than N requests in the last M seconds, and False otherwise.
#Concurrency
#System Design
#Queues
Difficulty Radar
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Senior EngineerFocuses on core competencies, system constraints, and clear communication.
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Always explain your thought process before writing code or drawing architecture.