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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

← Clerk

Senior Backend at Clerk

BackendSeniorRejected◆ Commonly asked· 2025

6-round senior backend process. Balanced across coding, design, and collaboration.

The loop · 6 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Merge intervals.
    SeniorMedium◆ Commonly asked
    #intervals#sorting
    PracticeLeetCode↗GeeksforGeeks↗
  • Sort colors.
    SeniorMedium◆ Commonly asked
    #two-pointers#array
    PracticeLeetCode↗GeeksforGeeks↗
  • Group anagrams from a list of strings.
    SeniorMedium◆ Commonly asked
    #hashmap#string
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build auth middleware that verifies a JWT.
    SeniorMedium◆ Commonly asked
    #auth#security
    PracticeGeeksforGeeks↗Search↗
  • Implement an idempotent "charge" endpoint.
    SeniorHard◆ Commonly asked
    #idempotency#payments
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 2 questions

System Design

High-level architecture of a large-scale system.

  • Design a notification system (push/email/SMS).
    SeniorMedium◆ Commonly asked
    #queues#fanout
    PracticeGeeksforGeeks↗Search↗
  • Design a multi-tenant SaaS data model.
    SeniorHard◆ Commonly asked
    #multi-tenancy#databases
    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 design a public API for backward compatibility?
    SeniorMedium◆ Commonly asked
    #api-design
    PracticeGeeksforGeeks↗Search↗
  • Explain eventual consistency with a real example.
    SeniorHard◆ Commonly asked
    #distributed
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 1 question

Hiring Manager

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

  • Where do you want to grow in the next two years?
    Senior◆ Commonly asked
    #growth
06

Round 06 · 2 questions

Behavioral / HR

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

  • Tell me about a time you had to say no to a stakeholder.
    Senior◆ Commonly asked
    #influence#star
  • Describe mentoring or unblocking another engineer.
    Senior◆ Commonly asked
    #mentorship#star

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