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
Backend Engineer
•
Coding
•
medium
Write a function to implement an LRU (Least Recently Used) Cache. This is often used for caching user profiles in memory.
#Linked List
#Hash Map
#Design
Backend Engineer
•
Coding
•
medium
Implement a Trie (Prefix Tree) to support autocomplete for user handles (@mentions).
#Trie
#Design
#String
Backend Engineer
•
Coding
•
hard
Implement a basic LFU (Least Frequently Used) Cache.
#Hash Map
#Linked List
#Design
Full Stack Engineer
•
Coding
•
medium
Implement an autocomplete system for @mentions. As the user types, return the top 5 matching usernames based on a combination of prefix match and the user's interaction frequency.
#Trie
#Hash Maps
#Sorting
Full Stack Engineer
•
Coding
•
medium
Design and implement an LRU (Least Recently Used) Cache to store recently fetched tweets on the client side.
#Linked Lists
#Hash Maps
#Caching
Difficulty Radar
Based on recent AI-sourced data.
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The "Standard" Interviewer
Senior EngineerFocuses on core competencies, system constraints, and clear communication.
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