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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

← WorkOS

Senior Backend at WorkOS

BackendSeniorOutcome unknown◆ Commonly asked· 2023

Senior backend interview. Coding-heavy early, design and behavioral later.

The loop · 6 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Insert interval.
    SeniorMedium◆ Commonly asked
    #intervals
    PracticeLeetCode↗GeeksforGeeks↗
  • Word ladder — shortest transformation sequence.
    SeniorHard◆ Commonly asked
    #bfs#graph
    PracticeLeetCode↗GeeksforGeeks↗
  • Combination sum.
    SeniorMedium◆ Commonly asked
    #backtracking
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Implement an LRU + TTL cache library.
    SeniorHard◆ Commonly asked
    #cache#ttl
    PracticeGeeksforGeeks↗Search↗
  • Build a file-upload service with chunking and resume.
    SeniorHard◆ Commonly asked
    #streaming#storage
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 2 questions

System Design

High-level architecture of a large-scale system.

  • Design a search indexing pipeline (crawl to index to serve).
    SeniorHard◆ Commonly asked
    #indexing#pipeline
    PracticeGeeksforGeeks↗Search↗
  • Design a ticket booking system (inventory + concurrency).
    SeniorHard◆ Commonly asked
    #concurrency#transactions
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • How do you design a public API for backward compatibility?
    SeniorMedium◆ Commonly asked
    #api-design
    PracticeGeeksforGeeks↗Search↗
  • ACID vs BASE and transaction isolation levels.
    SeniorHard◆ Commonly asked
    #databases#transactions
    PracticeGeeksforGeeks↗Search↗
  • Explain the difference between horizontal and vertical scaling.
    SeniorEasy◆ Commonly asked
    #scale
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 1 question

Hiring Manager

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

  • How do you handle disagreement with a product partner?
    Senior◆ Commonly asked
    #collaboration
06

Round 06 · 2 questions

Behavioral / HR

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

  • Describe working with an ambiguous or shifting requirement.
    Senior◆ Commonly asked
    #ambiguity#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.