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Interview questions from top companies, mapped to the exact round they show up in. Prep for what you will actually face.

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Online AssessmentDSA / CodingMachine CodingLow-Level Design

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The Loop aggregates publicly shared interview experiences and curated commonly-asked questions, each labeled with its source. Not affiliated with any company listed.

CC BY-NC 4.0 · © 2026

← Character.AI

Mid Full-stack at Character.AI

Full-stackMidRejected◆ Commonly asked· 2025

A mid fullstack loop. Fast-paced; expect follow-ups that push on depth.

The loop · 5 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Median of two sorted arrays.
    MidHard◆ Commonly asked
    #binary-search
    PracticeLeetCode↗GeeksforGeeks↗
  • Validate a binary search tree.
    MidMedium◆ Commonly asked
    #tree#dfs
    PracticeLeetCode↗GeeksforGeeks↗
  • Word search II.
    MidHard◆ Commonly asked
    #trie#backtracking
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Parse and evaluate a simple expression/DSL.
    MidMedium◆ Commonly asked
    #parsing
    PracticeGeeksforGeeks↗Search↗
  • Implement an exponential-backoff HTTP client.
    MidMedium◆ Commonly asked
    #reliability
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 1 question

Low-Level Design

Object-oriented / low-level design of a focused module.

  • Design a ride-hailing dispatch model (classes).
    MidHard◆ Commonly asked
    #oop#matching
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • SQL vs NoSQL — how do you choose for a given workload?
    MidMedium◆ Commonly asked
    #databases
    PracticeGeeksforGeeks↗Search↗
  • Trade-offs of gRPC vs REST vs GraphQL.
    MidMedium◆ Commonly asked
    #api-design
    PracticeGeeksforGeeks↗Search↗
  • How does the browser critical rendering path work?
    MidMedium◆ Commonly asked
    #browser#perf
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

Values, collaboration, and past-experience (STAR) questions.

  • Why this company, and why this role?
    Mid◆ Commonly asked
    #motivation
  • Tell me about a time you went above and beyond for a customer.
    Mid◆ Commonly asked
    #customer#star

Practice each round across every company

  • DSA / Coding
  • Machine Coding
  • Low-Level Design
  • Tech Deep-Dive
  • Behavioral / HR

◆ This experience is composed from commonly reported questions for this role and level. Real, individually-shared interviews will be layered in over time.