Pixis Associate Quality Assurance Engineer Interview Questions and Answers

Q1. Delete nth node from end in linked list
Ans. 
To delete the nth node from the end in a linked list, we can use a two-pointer approach.
• Use two pointers, one to traverse the list and another to keep track of the nth node from the end.

• Move the second pointer n steps ahead of the first pointer.

• When the second pointer reaches the end of the list, the first pointer will be at the nth node from the end.

• Adjust the pointers to delete the nth node.
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Q2. Project discussion
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Q1. Design Questions to build a scalable micro service
Ans. 
Design a scalable microservice architecture for handling high traffic and data efficiently.
• Use stateless services to allow easy scaling; e.g., RESTful APIs that don't store session data.

• Implement load balancing to distribute traffic evenly across instances; e.g., using Nginx or AWS ELB.

• Utilize containerization (Docker) for consistent environments and easy deployment.

• Incorporate a service registry (like Consul) for serv...read more
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Q2. Salary Discussion
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Q1. How can we improve the performance of a Front End System
Ans. 
Improving Front End System Performance
• Optimize images and reduce their size

• Minimize HTTP requests and use caching

• Use lazy loading for images and videos

• Reduce the number of DOM elements

• Use a Content Delivery Network (CDN)

• Minimize the use of external scripts and plugins

• Use asynchronous loading for scripts

• Optimize CSS and JavaScript files

• Use browser caching

• Implement server-side rendering
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Q2. What is Event Loop and give an example on how it works.
Ans. 
Event Loop is a mechanism that allows JavaScript to handle multiple tasks simultaneously.
• Event Loop is a part of JavaScript runtime that continuously checks the call stack and the task queue.

• It prioritizes the tasks in the queue and pushes them to the call stack when it's empty.

• This allows JavaScript to handle I/O operations and other asynchronous tasks without blocking the main thread.

• Example: setTimeout() function ad...read more
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Q1. 2 question on Data structure and algorithms (easy-medium and medium level questions)
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Q2. Related to array and matrix
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Q1. This also contained discussion on last company project and some basic question regarding different tech stack used. Then asked 2 questions on Data structure and algorithms (both medium level questions)
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Q2. Related to stack and linked list
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Q1. This was the Hiring Manager round. He asked different questions related to general programming like - Rest, Http, Websockets, TCP. Asked some questions from past company projects. Then asked one easy-mediu...read more
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Q2. Programming and Math related topics
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Q1. 2 DSA leetcode (1 medium , 1 hard)
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Q1. Same round 1 2 DSA leetcode questions (1 hard , 1 medium)
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Q1. It was the hiring manager round, it started with the LRU cache algorithm and went deep in the system design
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1 questions of leetcode medium level + project discussion

1 puzzle solving round

Q1. Questions about the project
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Q2. Describe your strength and weakness
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2 dsa questions of easy/medium

Q1. Asked two dsa questions of leetcodeeasy/medium
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Q1. Asked two dsa questions of leetcode easy/medium
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Q1. Asked one dsa question on tree and discussion on resume and dbms os
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Q1. Salary Discussion
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