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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

← Mercado Libre

Senior Backend at Mercado Libre

BackendSeniorRejected◆ Commonly asked· 2025

Senior backend interview. Fundamentals mattered as much as getting to an answer.

The loop · 6 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Subtree of another tree.
    SeniorEasy◆ Commonly asked
    #tree#dfs
    PracticeLeetCode↗GeeksforGeeks↗
  • LRU cache with O(1) get and put.
    SeniorMedium◆ Commonly asked
    #hashmap#linked-list
    PracticeLeetCode↗GeeksforGeeks↗
  • Climbing stairs.
    SeniorEasy◆ Commonly asked
    #dp
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build an in-memory rate limiter as a middleware.
    SeniorMedium◆ Commonly asked
    #rate-limit#middleware
    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 multi-tenant SaaS data model.
    SeniorHard◆ Commonly asked
    #multi-tenancy#databases
    PracticeGeeksforGeeks↗Search↗
  • Design a leaderboard for millions of players.
    SeniorMedium◆ Commonly asked
    #redis#ranking
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Explain connection pooling and why it matters.
    SeniorMedium◆ Commonly asked
    #databases
    PracticeGeeksforGeeks↗Search↗
  • Explain JWT structure and common pitfalls.
    SeniorMedium◆ Commonly asked
    #auth#security
    PracticeGeeksforGeeks↗Search↗
  • Sharding vs partitioning vs replication.
    SeniorHard◆ Commonly asked
    #databases#scale
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 1 question

Hiring Manager

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

  • Tell me about a project that slipped. What did you do?
    Senior◆ Commonly asked
    #delivery
06

Round 06 · 2 questions

Behavioral / HR

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

  • When did you take ownership of something outside your scope?
    Senior◆ Commonly asked
    #ownership#star
  • When did you have to make a decision with incomplete data?
    Senior◆ Commonly asked
    #judgment#star

Practice each round across every company

  • DSA / Coding
  • Machine Coding
  • System Design
  • Tech Deep-Dive
  • 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.