Walmart Interview Questions and Answers

Q1. LLD Concepts & Engineering Excellence
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Q2. CI & CD
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Q3. Design choices
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Q4. Dora Metrics, Observability
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Q5. Influx ,ELK, Kafka
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Q6. Design question
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Q1. Solution Design Round
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Q1. General Behaviour Questions
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Q1. Explain useState for managing state, useEffect for handling side effects, useMemo for performance optimization, and useCallback for memoizing functions. Understand how these hooks enhance functional compon...read more
Ans. 
Explanation of useState, useEffect, useMemo, and useCallback hooks in React functional components.
• useState is used to manage state in functional components

• useEffect is used for handling side effects like data fetching, subscriptions, etc.

• useMemo is used for performance optimization by memoizing expensive calculations

• useCallback is used for memoizing functions to prevent unnecessary re-renders

• These hooks enhance functio...read more
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Q2. Describe lifecycle methods in class components and their functional equivalents with hooks. Know how to handle component mounting, updating, and unmounting.
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Lifecycle methods in class components and their hooks equivalents manage component behavior during mounting, updating, and unmounting.
• componentDidMount: Runs after the component is mounted. Use useEffect(() => { /* code */ }, []); for hooks.

• componentDidUpdate: Invoked after updates. Use useEffect(() => { /* code */ }, [dependencies]); for hooks.

• componentWillUnmount: Cleanup before unmounting. Use return function ...read more
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Q3. Understand setting up a Redux store, connecting components, and managing actions and reducers. Be familiar with middleware like Redux Thunk or Redux Saga for handling asynchronous actions.
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Setting up Redux store, connecting components, managing actions and reducers, and using middleware like Redux Thunk or Redux Saga for handling asynchronous actions.
• Setting up a Redux store involves creating a store with createStore() function from Redux, combining reducers with combineReducers(), and applying middleware like Redux Thunk or Redux Saga.

• Connecting components to the Redux store can be done using the connec...read more
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Q4. How to add and manipulate elements in arrays using JavaScript (e.g., inserting "watermelon" in the middle)?
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To add and manipulate elements in arrays using JavaScript, you can use array methods like splice() and slice().
• Use the splice() method to insert elements into an array at a specific index. For example, arr.splice(index, 0, 'watermelon') will insert 'watermelon' at the specified index without removing any elements.

• To manipulate elements in an array, you can use methods like splice() to remove elements or slice() to extr...read more
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Q5. Use and purpose of Math.floor() in JavaScript.
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Math.floor() is a method in JavaScript that rounds a number down to the nearest integer.
• Math.floor() returns the largest integer less than or equal to a given number.

• It is commonly used to convert a floating-point number to an integer.

• Example: Math.floor(3.9) returns 3.
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Q6. Mocking components in Jest, including handling props and named exports
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Mocking components in Jest for testing with props and named exports
• Use jest.mock() to mock components and their exports

• For handling props, use jest.fn() to create mock functions and pass them as props to the component being tested

• For named exports, use jest.mock() with a second argument to specify the module's exports
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A test that rated your ability to work retail and handel customers.

Q1. Whats your availability like/ is it flexible.
Ans. 
I have a flexible availability and can adjust my schedule as needed.
• I am available to work weekdays, weekends, and evenings.

• I can easily switch shifts with advance notice.

• I am open to working overtime if required.

• I am willing to accommodate any scheduling needs of the company.
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Q2. Whats your previous job experiences.
Ans. 
I have 5 years of experience in marketing and sales roles at a tech company.
• Worked on developing marketing strategies to increase brand awareness

• Managed social media accounts and created engaging content

• Collaborated with sales team to generate leads and close deals
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Q3. How well can you manage unhappy/ unpleasant customers.
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I have experience in de-escalating situations with unhappy customers by actively listening, empathizing, and finding solutions.
• Active listening to understand the customer's concerns

• Empathizing with the customer's emotions

• Finding solutions to address the customer's issues

• Remaining calm and professional throughout the interaction

• Offering alternatives or compensation when appropriate
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Q4. How are your customer service skills.
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I excel in customer service by actively listening, empathizing, and providing tailored solutions to meet client needs.
• Active Listening: I ensure I fully understand customer concerns by paraphrasing their issues back to them.

• Empathy: I relate to customers' feelings, which helps build rapport and trust, such as when I assisted a distressed client with a billing issue.

• Problem-Solving: I approach challenges with a solution...read more
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Q5. Are you a good team worker or better alone.
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Q1. What do you know about catalog analyst role?
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Catalog Analyst role involves managing product data, ensuring accuracy and consistency in catalogs.
• Responsible for creating, updating, and maintaining product catalogs

• Ensuring accuracy and consistency of product data

• Analyzing catalog performance and making recommendations for improvements

• Collaborating with cross-functional teams such as marketing, sales, and product development

• Knowledge of data management systems and t...read more
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Q2. Any 5 excel shortcuts
Ans. 
Five useful Excel shortcuts for efficient data analysis.
• Ctrl + C: Copy selected cells

• Ctrl + V: Paste copied cells

• Ctrl + Z: Undo previous action

• Ctrl + Shift + Arrow Key: Select entire data range in a direction

• Ctrl + Home: Move to cell A1
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Q3. When do you use pivot table, vlookup, hlookup, xlookup?
Ans. 
Pivot table for summarizing data, vlookup for finding values in a table, hlookup for horizontal lookup, xlookup for advanced lookup.
• Pivot table is used to summarize and analyze large datasets.

• VLOOKUP is used to find a value in a table by row.

• HLOOKUP is used to find a value in a table by column.

• XLOOKUP is a more advanced version of VLOOKUP and HLOOKUP, allowing for more flexibility in searching for data.

• Example: Use piv...read more
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Q4. Questions from resume
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Conduct a voice test focusing on spontaneous communication within the software, ensuring it is time-oriented.

Q1. Self Intro and overall experience.
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Q1. Print even and odd numbers using two threads simultaneously so it should print in sequence
Ans. 
Use two threads to print even and odd numbers in sequence
• Create two threads, one for printing even numbers and one for printing odd numbers

• Use synchronization mechanisms like mutex or semaphore to ensure numbers are printed in sequence

• Start both threads simultaneously and let them print numbers alternately
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Q1. Core java questions and project discussion
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Q1. Cycle in linked list and behavioral
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Detecting cycle in a linked list and discussing behavioral aspects
• Explain how to use Floyd's Tortoise and Hare algorithm to detect a cycle in a linked list

• Discuss the importance of understanding memory management in linked lists to prevent cycles

• Explain the impact of cycles in linked lists on time complexity and space complexity of algorithms
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