Lam Research Software QA Engineer Interview Questions and Answers

Q1. What is shared memory
Ans. 
Shared memory is a memory space that multiple processes can access and use to communicate with each other.
• Shared memory allows multiple processes to share data without the need for inter-process communication mechanisms like pipes or sockets.

• It is commonly used in parallel computing to improve performance by allowing processes to share data quickly.

• Shared memory can be implemented using techniques like memory mapping o...read more
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Q2. Write a member function to find the second largest number in an array
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Write a member function to find the second largest number in an array.
• Iterate through the array and keep track of the largest and second largest numbers.

• Handle edge cases like when the array has less than 2 elements.

• Consider sorting the array and returning the second last element for a simpler solution.
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Q3. What is core and how to determine it
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Core is the central or most important part of something. Determining the core involves identifying the key components or elements.
• Core is the central or essential part of a system or object

• To determine the core, identify the key components or elements that are crucial for the functionality or purpose of the system

• In software QA, determining the core may involve identifying the critical features or functionalities that ...read more
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Q4. How defect management systems work
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Defect management systems track, prioritize, and resolve software issues throughout the development lifecycle.
• Defects are reported by testers or users and logged into the system.

• Each defect is assigned a priority level based on its impact on the software.

• Defects are tracked from discovery to resolution, with status updates along the way.

• Defect management systems help teams prioritize and allocate resources efficiently.

• ...read more
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Q5. How do you add a file to bitbucket
Ans. 
To add a file to Bitbucket, you can use the web interface or command line tools.
• Navigate to the repository where you want to add the file

• Click on the 'Add file' button or use 'git add' command to add the file

• Commit the changes with a message describing the file addition

• Push the changes to the remote repository
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Q6. How to check the processes running in linux machine
Ans. 
To check processes running in a Linux machine, you can use commands like ps, top, and htop.
• Use 'ps' command to display information about processes

• Use 'top' command to display dynamic real-time view of processes

• Use 'htop' command for an interactive process viewer
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It was hard and got tons of ds qs

Problem would be given to solve

Q1. Questions will be based on their the first round
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Q2. Questions will be from their projects
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Q1. Behavioral questions
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Q1. General behavioral and situational questions about team members
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Q1. Identify if the number is positive, negative or zero
Ans. 
Identify if a number is positive, negative, or zero
• Check if the number is greater than 0 to determine if it is positive

• Check if the number is less than 0 to determine if it is negative

• If the number is neither greater nor less than 0, it is zero
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Q1. What is confusion matrix
Ans. 
A confusion matrix is a table that is often used to describe the performance of a classification model.
• It is a matrix with rows representing the actual class and columns representing the predicted class.

• It helps in evaluating the performance of a classification model by showing the number of correct and incorrect predictions.

• It consists of four quadrants: True Positive, False Positive, True Negative, and False Negative...read more
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Q2. Define your project
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Q3. Define principle component analysis
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Principal component analysis is a statistical technique used to reduce the dimensionality of data while preserving important information.
• PCA is used to identify patterns in data and express it in a more easily understandable form.

• It works by finding the directions (principal components) along which the variance of the data is maximized.

• These principal components are orthogonal to each other, meaning they are uncorrelat...read more
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Q4. Define inventory policy and inventory control method
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Inventory policy is a set of guidelines for managing inventory levels, while inventory control method is the process of implementing those guidelines.
• Inventory policy determines when to order new inventory and how much to order

• Inventory control method involves tracking inventory levels, forecasting demand, and optimizing order quantities

• Examples of inventory policies include Just-in-Time (JIT) and Economic Order Quanti...read more
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Q5. What is reverse logistics
Ans. 
Reverse logistics is the process of moving goods from their final destination back to the manufacturer or point of origin for resale, recycling, or disposal.
• Involves returning products from customers to the manufacturer or retailer

• Includes activities such as returns, refurbishment, recycling, or disposal

• Helps in reducing waste and maximizing value from returned products

• Examples: returning a defective product to the man
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