Walmart Senior QA Engineer Interview Questions and Answers

Will be asked for basic python competency

Q1. How does the internet work end to end
Ans. 
The internet is a global network of interconnected devices that communicate using standardized protocols.
• Data is sent in packets using the TCP/IP protocol

• Devices are identified using unique IP addresses

• DNS translates domain names to IP addresses

• Routers direct traffic between networks

• Firewalls protect against unauthorized access

• Encryption ensures secure communication
Answered by AI
Add your answer
Q2. What is the stack overflow error
Ans. 
Stack overflow error occurs when the call stack exceeds its limit due to infinite or too many recursive function calls.
• Occurs when the call stack is full

• Caused by infinite or too many recursive function calls

• Can lead to program crashes or unexpected behavior
Answered by AI
Add your answer

Q1. Its a normal questions which usually service based company asked
Add your answer
Q2. Overall it is good
Add your answer

Ask you to implement any solution like caching using LRU or LFU

Its a manager round where they discuss about u=your past experiences and also they tell you about the project

Q1. I think they gave you only based on your previous offer.
Add your answer
Q2. Negotiate well with them . Don't accept just for the sake of an offer because further they will not change it until/ unless it is filling position.
Add your answer

Q1. Immutable Class, Remove duplicates from string using java 8
Ans. 
Immutable class, remove duplicates from string using Java 8
• Create an immutable class to represent the string

• Use Java 8 streams to remove duplicates from the string

• Convert the string to a character array, use distinct() and collect() to remove duplicates
Answered by AI
Add your answer
Q2. Sealed classes in java
Ans. 
Sealed classes in Java restrict inheritance to a predefined set of subclasses.
• Sealed classes were introduced in Java 15 to restrict inheritance to a predefined set of subclasses.

• Subclasses of a sealed class must be declared in the same file as the sealed class.

• Sealed classes are declared using the 'sealed' modifier before the 'class' keyword.

• Example: sealed class Shape permits Circle, Square, Triangle;
Answered by AI
Add your answer

Q1. Fallout Mechanism between the microservices
Ans. 
Fallout mechanism between microservices refers to how failures in one microservice can impact other microservices.
• Fallout can occur due to cascading failures when one microservice depends on another.

• Implementing circuit breakers can help prevent fallout by isolating failures.

• Monitoring and alerting systems are crucial for detecting and responding to fallout.

• Using asynchronous communication can reduce the impact of fall...read more
Answered by AI
Add your answer

Q1. 2 DS questions, 1 SQL question
Add your answer
Q2. Details of projects worked, containerization, APIs
Ans. 
I have worked on multiple projects involving containerization and developing APIs.
• Developed microservices using Docker containers for easy deployment and scalability

• Created RESTful APIs using Node.js and Express framework

• Integrated third-party APIs for data retrieval and processing

• Utilized Kubernetes for container orchestration and management
Answered by AI
Add your answer

Q1. Python - ML/DS pipeline
Add your answer
Q2. Java- Springboot framework
Add your answer

Q1. Questions about JavaScript, different types of DataTypes,
Add your answer
Q2. Write code to add elements dynamically
Ans. 
Adding elements dynamically to an array in code
• Use push() method to add elements to an array in JavaScript

• In Python, use append() method to add elements to a list

• In Java, use ArrayList and add() method to dynamically add elements
Answered by AI
View 1 more answer
Q3. What is Hoisting
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
• Hoisting applies to both variables and functions in JavaScript.

• Variables declared with 'var' are hoisted, but their initialization is not.

• Example: console.log(x); var x = 5; // Outputs 'undefined' due to hoisting.

• Function declarations are fully hoisted, allowing calls before thei...read more
Answered by AI
Add your answer

Q1. Current CTC, Experience
Add your answer
Q2. What is expected CTC
Ans. 
Expected CTC should be based on industry standards, experience, skills, and location.
• Research industry standards for Software Engineer salaries

• Consider your experience level and skills when determining expected CTC

• Take into account the cost of living in the location of the job

• Negotiate based on the job responsibilities and market demand
Answered by AI
Add your answer