LambdaTest Software Developer Intern Interview Questions and Answers

Q1. Which should prefer flow or trigger
Ans. 
It depends on the specific requirements and use case.
• Use flows for declarative automation and to automate standard processes.

• Use triggers for more complex automation and to perform custom logic.

• Flows are easier to build and maintain, while triggers offer more flexibility and control.

• Consider the complexity of the automation, the need for custom logic, and the scalability of the solution.
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Chrome and Firefox Browser automation

Log file tail last n lines where n is configurable. Followup question on how you can optimize it further incase log file size is in TBs and incase it is cluster of servers

Q1. Detailed Technical background check and discussion on past projects.
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Q2. Messaging queue and best practices
Ans. 
Messaging queues are used to manage asynchronous communication between different components of a system.
• Use a reliable messaging queue system like RabbitMQ or Apache Kafka

• Ensure messages are properly formatted and serialized

• Implement message acknowledgement and retry mechanisms

• Monitor queue health and performance

• Consider message ordering and partitioning for scalability

• Avoid long-running tasks in message handlers
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Q3. Binary Search Tree twisted question
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Q4. Map Reduce concept for solving dictionary keywords
Ans. 
MapReduce is a programming model for processing large data sets in parallel.
• MapReduce divides the input data into chunks and processes them in parallel.

• It consists of two phases: Map and Reduce.

• Map function takes input data and converts it into key-value pairs.

• Reduce function takes the output of Map as input and combines the values with the same key.

• It is used for solving dictionary keywords by mapping each word to a k
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Normal 3 leetcode medium questions

Machine coding round to design tail -f

Q1. Questions on internal working of os
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Q2. Questions on projects
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Implement tail -f command

Q1. Kafka partitions
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Q2. Elasticsearch queries
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Q1. Why Browserstack?
Ans. 
Browserstack is a popular cloud-based cross-browser testing tool used by developers worldwide.
• Provides access to a wide range of browsers and devices for testing

• Allows for parallel testing to save time and increase efficiency

• Integrates with popular testing frameworks like Selenium and Appium

• Offers features like screenshots, video recordings, and debugging tools

• Used by companies like Microsoft, Twitter, and Airbnb for t
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Q2. Any challenge you faced at current company?
Ans. 
Yes, I faced a challenge in integrating a new third-party API with our existing system.
• Had to understand the documentation of the API thoroughly

• Encountered compatibility issues with our system

• Worked closely with the API provider to troubleshoot and resolve issues
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MCQ based Questions from topics of DSA , web development

Q1. Asked us to live code tail -f unix command
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Machine coding round

Q1. TCP/IP related questions, what happens when you search a webpage?
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Q2. Past projects discussions
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Q1. Behavioural questions on how would you tackle a particular scenario
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Round duration - 60 Minutes
Round difficulty - Medium

The platform was HackerEarth time duration was 1 hour.
2 Coding questions were asked, 30 minutes for each were allotted.

Q1. 
Longest Substring Without Repeating Characters Problem Statement
Given a string S of length L, determine the length of the longest substring that contains no repeating characters.
Example:
Input:
"abac...read more
Ans. 
The problem asks to find the length of the longest substring without repeating characters in a given string.
• Use a sliding window approach to iterate through the string and keep track of the characters seen so far.

• Maintain a set to check for duplicate characters within the current substring.

• Update the maximum length of the substring whenever a duplicate character is encountered.

• Continue the process until the end of the ...read more
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Q2. 
Find All Triplets with Zero Sum
Given an array Arr consisting of N integers, find all distinct triplets in the array that sum up to zero.
Explanation:
An array is said to have a triplet {Arr[i], Arr[j],...read more
Ans. 
The task is to find all distinct triplets in an array that add up to zero.
• Iterate through the array and fix the first element of the triplet.

• Use two pointers approach to find the other two elements that sum up to the negative of the fixed element.

• Skip duplicate elements to avoid duplicate triplets.

• Return the list of triplets found.
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Round duration - 120 Minutes
Round difficulty - Hard

This was a 2 hours round, with the following problem statement. At the end of the allotted time you had give a demo and explain your implementation.

Round duration - 45 Minutes
Round difficulty - Medium

The platform was Zoom, time duration was 45 mins. Started with Tell me something about yourself. I told them, that I like solving algorithms and real life problems.