Walmart Labs Interview Questions
Practice 31 real interview questions from Walmart Labs. Covers Coding & Algorithms, Behavioral & Leadership, System Design, Machine Learning. For roles including Software Engineer, Data Scientist, Machine Learning Engineer, Product Manager.
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Compute days until plants stop dying
You are given a row of plants, each with an integer pesticide level. Rules - On each day, any plant with a strictly greater pesticide level than the p...
Implement lexicographically smallest Two Sum
You are given an unsorted integer array nums and an integer target. Return the indices [i, j] (0-based) such that i < j and nums[i] + nums[j] == targe...
Design a multi-carrier parcel delivery system
Design a system for shipping customer parcels that supports multiple delivery partners/carriers (e.g., UPS, USPS, FedEx). Your system should enable an...
Count ways to make change (DP)
Problem You are given an integer amount and an array of positive, distinct integers coins, where each coin value can be used unlimited times. Return t...
Design an online ticket marketplace
Design a Ticketmaster-like system for discovering events and buying tickets. Your design should cover: - Functional requirements (e.g., browse/search ...
Answer leadership scenarios about influence and integrity
Answer the following behavioral questions with concrete examples (use STAR: Situation, Task, Action, Result): 1. Describe a time you convinced others ...
Check whether brackets are balanced
Problem Given a string s that may contain bracket characters, determine whether the brackets are properly balanced. Treat the following as brackets: -...
Implement a Shape interface using OOP
Problem You are given the following interface (language-agnostic): `text interface Shape { double area(); double perimeter(); } ` Design and imple...
Convert Dictionary to DataFrame
Using Python and pandas, convert the following dictionary into a DataFrame. Each top-level key is a target column name, and each value is a list of [r...
Design Spring Boot for high availability and background work
System Design (Spring Boot) You are designing a Spring Boot application that must run reliably in production. 1. High availability & load balancing: H...
Answer Spring Boot and Thymeleaf engineering questions
Spring Boot + Thymeleaf (Engineering Questions) Answer the following interview questions with concrete debugging steps, best practices, and design cho...
Handle conflict and motivate engineering teams
You are interviewing for a Senior Software Engineer / Tech Lead role. The interviewer asks two related leadership questions: 1. Handling conflict ...
Design an item category prediction system
Design an end-to-end ML system that predicts an item’s category/type (multi-class or hierarchical classification), e.g., assigning an e-commerce listi...
Find shared courses between student pairs
Problem Set (Coding) You are given multiple coding questions from an interview. Implement each function as described. --- 1) Course Overlap You are gi...
Design aggregator for multiple downstream services
Design a backend service for a large retailer (similar to Walmart) that must call many downstream services to fulfill a single user request. When a cl...
Merge two sorted arrays in-place
You are given two integer arrays sorted in non-decreasing order, and two integers m and n: - nums1 has length m + n. The first m elements of nums1 con...
Calculate Sample Size for Effective A/B Test Design
A/B Test Planning: Sample Size and Power Scenario You are planning an online A/B test to evaluate a new marketing feature. The primary success metric ...
Design an LLM agent with RAG and tools
You’re asked to describe how you would build an LLM-based agent that can converse with a user (e.g., an interviewer) and answer questions using an int...
Find Index Pairs of Matching Elements in Arrays
Scenario Marketing analytics team needs to find common elements between two sorted arrays of user IDs. Question Given two sorted integer arrays withou...
Predict Next-Period Conversion Rate Using Historical Campaign Data
Predicting Next-Period Conversion Rate from Campaign Logs Context You have historical campaign panel data with columns: adid, date, impressions, click...