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
Full Stack Engineer
•
Coding
•
easy
Implement a deep clone function for a complex state object in React, ensuring that nested objects, arrays, and Date objects are copied by value, not reference.
#JavaScript
#Recursion
#Object Manipulation
Full Stack Engineer
•
Coding
•
medium
Implement a custom debounce function in JavaScript that supports both leading and trailing edge execution. This is used for the search bar on X.
#JavaScript
#Closures
#Asynchronous Programming
Full Stack Engineer
•
Technical
•
medium
How would you optimize the rendering performance of an infinite scrolling list of tweets in React to prevent DOM bloat and memory leaks?
#React
#Virtualization
#Performance
Full Stack Engineer
•
Technical
•
medium
Explain how you would implement optimistic UI updates for the 'Like' button on a tweet. How do you handle network failures?
#UX
#State Management
#Error Handling
Full Stack Engineer
•
Technical
•
hard
Explain how you would handle state management for a complex web app like X Pro (formerly TweetDeck) with multiple independent columns updating in real-time.
#State Management
#Redux
#React Context
#Architecture
Full Stack Engineer
•
Technical
•
hard
What strategies would you use to optimize the initial load time (Time to Interactive / First Contentful Paint) of the X web application?
#Performance
#SSR
#Code Splitting
#Web Vitals
Difficulty Radar
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Senior EngineerFocuses on core competencies, system constraints, and clear communication.
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