Walmart Labs interview questions

Showing 1–30 of 38 results

• Answer Spring Boot and Thymeleaf engineering questionsMedium

  This problem tests your understanding of Spring Boot MVC architecture, specifically how to manage session-scoped state, optimize view rendering, and implement robust server-side validation using Thymeleaf.

  Walmart LabsSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Answer leadership scenarios about influence and integrityMedium

  This question evaluates leadership competencies including influence without formal authority, data-driven decision-making, incident response and ethical integrity/compliance judgment in a software engineering context.

  Walmart LabsSoftware EngineerBehavioral & LeadershipTechnical Screen
• Assess Cultural Fit in Informal Hiring ConversationsMedium

  This interview question evaluates behavioral evidence, ownership, communication, trade-offs, and measurable outcomes in a realistic interview setting. A strong answer for Assess Cultural Fit in Informal Hiring Conversations states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  Walmart LabsData ScientistBehavioral & LeadershipOnsite
• Check whether brackets are balancedMedium

  This problem tests your ability to handle nested structures using a stack data structure to track opening symbols and verify matching closing symbols.

  Walmart LabsSoftware EngineerCoding & AlgorithmsTechnical Screen
• Compare Quicksort and Mergesort in PracticeMedium

  This problem tests your deep understanding of sorting algorithm internals beyond asymptotic complexity, focusing on practical trade-offs in memory, stability, and data characteristics.

  Walmart LabsSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Compute days until plants stop dyingMedium

  This question evaluates a candidate's ability to reason about array-based state transitions and algorithmic complexity, testing competency in analyzing iterative dependencies among elements and handling large input sizes.

  Walmart LabsSoftware EngineerCoding & AlgorithmsTechnical Screen
• Compute the Minimum Number of Meeting RoomsMedium

  Determine the minimum number of meeting rooms required to accommodate a set of schedule intervals where intervals are half-open and meetings can start at the exact moment another ends.

  Walmart LabsSoftware EngineerCoding & AlgorithmsTechnical Screen
• Count ways to make change (DP)Medium

  This problem tests the ability to solve the classic 'Coin Change II' problem using dynamic programming to count the number of unique combinations that sum up to a target amount.

  Walmart LabsSoftware EngineerCoding & AlgorithmsTechnical Screen
• Describe past projects and impactMedium

  This question evaluates ownership, technical decision‑making, system design trade-offs, cross‑team leadership, execution discipline and impact measurement within software engineering projects.

  Walmart LabsSoftware EngineerBehavioral & LeadershipTechnical Screen
• Design Spring Boot for high availability and background workMedium

  This question tests the ability to scale a stateless Spring Boot service while ensuring reliable execution of asynchronous background tasks in a distributed environment.

  Walmart LabsSoftware EngineerSystem DesignTechnical Screen
• Design a Conversational Agent for Finding Vacation RentalsEasy

  Design a multi-turn assistant that turns a traveler's free-form trip description into structured, grounded rental search results. Tests where to use an LLM versus deterministic search, clarification strategy, safety against hallucination and injection, and evaluation against classic search.

  Walmart LabsMachine Learning EngineerML System DesignOnsite
• Design a Large-Scale Real-Time Temperature Collection SystemMedium

  Design an end-to-end IoT temperature telemetry platform capable of ingesting high-throughput sensor streams, handling out-of-order data, projecting real-time status, and managing long-term time-series storage.

  Walmart LabsSoftware EngineerSystem DesignTechnical Screen
• Design a Metrics Monitoring DashboardMedium

  This question tests the ability to architect a scalable time-series data pipeline, focusing on ingestion, storage strategies for high-throughput metric data, and query performance for dashboard visualization.

  Walmart LabsSoftware EngineerSystem DesignTechnical Screen
• Design a Read- and Write-Heavy Product Catalog ServiceMedium

  Design a scalable, highly available product catalog platform supporting both high-frequency merchant updates and massive shopper read traffic while maintaining data integrity and search consistency.

  Walmart LabsSoftware EngineerSystem DesignOnsite
• Design a multi-carrier parcel delivery systemMedium

  This question evaluates system design and integration competencies, including distributed architecture, API design, data modeling, reliability, scalability, and handling heterogeneous third-party carrier integrations for a multi-carrier parcel shipping platform.

  Walmart LabsSoftware EngineerSystem DesignTechnical Screen
• Design aggregator for multiple downstream servicesEasy

  This question assesses the ability to design an API Gateway or Aggregator service that coordinates requests to multiple downstream microservices while managing latency, partial failures, and data aggregation.

  Walmart LabsSoftware EngineerSystem DesignOnsite
• Design an Agentic Search ExperienceEasy

  Design an agentic search experience with clarifying dialogue, structured constraints, grounded retrieval, bounded tool use, and evaluation against conventional search.

  Walmart LabsMachine Learning EngineerML System DesignOnsite
• Design an E-Commerce Checkout Flow That Prevents Concurrency BugsHard

  Design the checkout flow for a large online retailer, from cart to a confirmed, paid order, with the emphasis on preventing concurrency bugs. It tests stock reservation without overselling, idempotent order placement and payment, handling of carts and prices that change mid-checkout, and recovery from partial failures.

  Walmart LabsSoftware EngineerSystem DesignOnsite
• Design an LLM agent with RAG and toolsEasy

  This problem tests the ability to architect an LLM-based agent capable of retrieving information and performing actions, focusing on orchestration, tool execution, and system reliability.

  Walmart LabsMachine Learning EngineerMachine LearningOnsite
• Design an item category prediction systemEasy

  This question tests the ability to design an end-to-end classification system for assigning retail items into a hierarchical category structure, focusing on feature selection, model architecture, and production deployment.

  Walmart LabsMachine Learning EngineerML System DesignOnsite
• Design and Implement an In-Memory Job Scheduler for Delayed JobsHard

  Design and implement an in-memory job scheduler that runs submitted jobs after a delay and supports cancellation and shutdown. It tests choosing a structure ordered by due time, thread-safe coordination without busy waiting, worker concurrency, failure isolation and the trade-offs of recurring or persistent jobs.

  Walmart LabsSoftware EngineerSoftware Engineering FundamentalsOnsite
• Find Index Pairs of Matching Elements in ArraysMedium

  This question evaluates the ability to work with sorted arrays, index mapping, duplicate handling, and reasoning about correctness and algorithmic complexity.

  Walmart LabsData ScientistCoding & AlgorithmsOnsite
• Find first non-repeating characterEasy

  This problem tests your ability to use hash maps or frequency arrays to achieve optimal time complexity when processing character streams or strings.

  Walmart LabsMachine Learning EngineerCoding & AlgorithmsOnsite
• Find shared courses between student pairsMedium

  This problem tests your ability to efficiently map relationships and compute intersections between multiple sets to identify commonalities across pairs.

  Walmart LabsSoftware EngineerCoding & AlgorithmsTechnical Screen
• Find the Longest Even-Length WordEasy

  Tests string tokenization, linear scanning, tie-breaking logic, and handling of edge cases such as absent matches or irregular whitespace.

  Walmart LabsSoftware EngineerCoding & AlgorithmsTechnical Screen
• Find the Single Repeated Value Among n + 1 Integers Drawn from 1 to nHard

  Given an array of n + 1 integers whose values all lie between 1 and n, return the one value that repeats, possibly several times. The challenge is solving it without modifying the array and with constant extra memory, which rules out sorting, hash sets and counting arrays.

  Walmart LabsSoftware EngineerCoding & AlgorithmsOnsite
• Handle conflict and motivate engineering teamsEasy

  This question evaluates leadership competencies including conflict resolution, stakeholder management, and team motivation, emphasizing interpersonal decision-making and balancing technical quality with timelines.

  Walmart LabsSoftware EngineerBehavioral & LeadershipOnsite
• Implement a Range Module with Add, Query, and RemoveHard

  Design a data structure that tracks coverage of real numbers using half-open intervals, supporting dynamic additions, removals, and continuous coverage queries. This tests ordered data structure manipulation, interval merging/splitting invariants, and binary search.

  Walmart LabsSoftware EngineerCoding & AlgorithmsTechnical Screen
• Implement a Shape interface using OOPMedium

  This problem tests your ability to design a robust object-oriented structure using interfaces and concrete class implementations, focusing on polymorphism and data encapsulation.

  Walmart LabsSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Implement lexicographically smallest Two SumMedium

  This question evaluates array manipulation, index-level reasoning, and algorithmic efficiency for locating pair sums under lexicographic tie-breaking, testing attention to ordering constraints and correct index selection.

  Walmart LabsSoftware EngineerCoding & AlgorithmsTechnical Screen