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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.

MIT · © 2026

← Coinbase

Senior Backend at Coinbase

BackendSeniorWithdrew◆ Commonly asked· 2023

A senior backend loop. Pragmatic questions — more real-world than pure puzzles.

The loop · 6 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Maximum depth of a binary tree.
    SeniorEasy◆ Commonly asked
    #tree#dfs
    PracticeLeetCode↗GeeksforGeeks↗
  • Binary tree level order traversal.
    SeniorMedium◆ Commonly asked
    #tree#bfs
    PracticeLeetCode↗GeeksforGeeks↗
  • Permutations.
    SeniorMedium◆ Commonly asked
    #backtracking
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Implement a token-bucket rate limiter as a service.
    SeniorMedium◆ Commonly asked
    #rate-limit
    PracticeGeeksforGeeks↗Search↗
  • Implement an LRU + TTL cache library.
    SeniorHard◆ Commonly asked
    #cache#ttl
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 2 questions

System Design

High-level architecture of a large-scale system.

  • Design a real-time fraud-detection pipeline.
    SeniorHard◆ Commonly asked
    #streaming#ml
    PracticeGeeksforGeeks↗Search↗
  • Design a ride-matching backend (riders ↔ nearby drivers).
    SeniorHard◆ Commonly asked
    #geospatial#matching#realtime
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • What is backpressure and how do you handle it?
    SeniorHard◆ Commonly asked
    #streaming#reliability
    PracticeGeeksforGeeks↗Search↗
  • How do you prevent and detect N+1 queries?
    SeniorMedium◆ Commonly asked
    #databases#orm
    PracticeGeeksforGeeks↗Search↗
  • How does a write-ahead log guarantee durability?
    SeniorHard◆ Commonly asked
    #databases
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 1 question

Hiring Manager

Scope, ownership, and role-fit discussion with the manager.

  • Walk me through the architecture of a system you owned end to end.
    Senior◆ Commonly asked
    #ownership#architecture
06

Round 06 · 2 questions

Behavioral / HR

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

  • Tell me about a time you simplified something overly complex.
    Senior◆ Commonly asked
    #judgment#star
  • Describe a time you improved a process or tool for your team.
    Senior◆ Commonly asked
    #ownership#star

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