Twitter / X
Real-time social platform with petabyte-scale data and ML ranking systems.
4 Rounds
~14 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
•
Coding
•
medium
Implement a rate limiter for the Twitter API.
#System Design
#Concurrency
#Data Structures
Machine Learning Engineer
•
Coding
•
medium
Given a stream of tweets, write an algorithm to find the Top K trending hashtags in the last 1 hour.
#Heaps
#Sliding Window
#Stream Processing
Machine Learning Engineer
•
Coding
•
medium
Design a data structure that supports insert, delete, and getRandom in O(1) time.
#Hash Tables
#Arrays
#Design
Machine Learning Engineer
•
Coding
•
medium
Given k sorted arrays of tweet timestamps, merge them into a single sorted array.
#Heaps
#Divide and Conquer
#Sorting
Machine Learning Engineer
•
Coding
•
medium
Find the shortest path between two users in a massive social graph (degrees of separation).
#Graph Theory
#BFS
#Bidirectional Search
Machine Learning Engineer
•
Coding
•
easy
Design an algorithm to detect cycles in a directed graph (e.g., detecting retweet loops or bot rings).
#Graph Theory
#DFS
Machine Learning Engineer
•
Coding
•
medium
Implement a Trie (Prefix Tree) to support insertion, search, and prefix search. This is used for hashtag autocomplete.
#Tries
#Strings
#Data Structures
Machine Learning Engineer
•
Coding
•
hard
Given a stream of tweets, write a function to keep track of the median engagement score in a sliding window.
#Heaps
#Sliding Window
#Stream Processing
Difficulty Radar
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Senior EngineerFocuses on core competencies, system constraints, and clear communication.
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