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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

← Datadog

Staff+ Full-stack at Datadog

Full-stackStaff+Offer◆ Commonly asked· 2025

5-round staff fullstack process. Balanced across coding, design, and collaboration.

The loop · 5 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Min cost to connect all points.
    Staff+Medium◆ Commonly asked
    #graph#mst
    PracticeLeetCode↗GeeksforGeeks↗
  • Rotate array.
    Staff+Medium◆ Commonly asked
    #array
    PracticeLeetCode↗GeeksforGeeks↗
  • Top K frequent elements.
    Staff+Medium◆ Commonly asked
    #heap#hashmap
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 1 question

Low-Level Design

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

  • Design a rate limiter with multiple strategies.
    Staff+Medium◆ Commonly asked
    #oop#rate-limit
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 2 questions

System Design

High-level architecture of a large-scale system.

  • Design a video-call UI with grid and speaker views.
    Staff+Hard◆ Commonly asked
    #frontend#webrtc#perf
    PracticeGeeksforGeeks↗Search↗
  • Design an event-driven order pipeline with retries.
    Staff+Hard◆ Commonly asked
    #events#queues
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 1 question

Hiring Manager

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

  • Tell me about a project that slipped. What did you do?
    Staff+◆ Commonly asked
    #delivery
05

Round 05 · 2 questions

Behavioral / HR

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

  • Tell me about a time you had to say no to a stakeholder.
    Staff+◆ Commonly asked
    #influence#star
  • Tell me about a time you went above and beyond for a customer.
    Staff+◆ Commonly asked
    #customer#star

Practice each round across every company

  • DSA / Coding
  • Low-Level Design
  • System Design
  • Hiring Manager
  • 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.