Twitter / X

Twitter / X

Real-time social platform with petabyte-scale data and ML ranking systems.

4 Rounds ~14 Days Hard
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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

Backend Engineer • Coding • easy

Implement a function to parse a tweet string and extract all unique hashtags and user mentions, returning them in the order they appeared.

#String Manipulation #Regex #Hash Set
Practice
Backend Engineer • Coding • medium

Given a stream of tweets, write an algorithm to find the top K trending hashtags over the last 1 hour.

#Heap #Hash Map #Sliding Window
Practice
Backend Engineer • Coding • medium

Given a list of user connections (follower/following), write a function to find the shortest connection path between two users (Degrees of Separation).

#Graph #BFS #Bidirectional BFS
Practice
Backend Engineer • Coding • medium

Given an array of intervals representing active ad campaigns, merge all overlapping intervals to find the total continuous time ads are running.

#Array #Sorting #Intervals
Practice
Backend Engineer • Coding • hard

Write an algorithm to serialize and deserialize a tree of threaded replies (N-ary tree) to a string and back.

#Tree #DFS #Serialization
Practice
Backend Engineer • Coding • medium

Given a list of tweets with timestamps, find the maximum number of tweets published within any 5-minute sliding window.

#Sliding Window #Two Pointers #Array
Practice
Backend Engineer • Coding • medium

Write a function to detect if there is a cycle in a retweet chain (represented as a directed graph).

#Graph #DFS #Cycle Detection
Practice
Backend Engineer • Coding • easy

Given two arrays representing the followers of User A and User B, write a function to return their mutual followers. Optimize for large arrays.

#Array #Hash Set #Two Pointers
Practice
Backend Engineer • Coding • easy

Given a string containing a tweet, check if it is a palindrome, ignoring spaces, punctuation, and casing.

#String #Two Pointers
Practice

Difficulty Radar

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Meet Your Interviewers

The "Standard" Interviewer

Senior Engineer

Focuses on core competencies, system constraints, and clear communication.

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Think Out Loud

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