Lekha Wireless Solutions Senior Software Engineer Interview Questions and Answers

Q1. Array Linked list BST
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Q1. Array LL BST Stack
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Q1. How to list out relevant files from a folder which was updated in a given time period
Ans. 
Use a script to list relevant files updated within a given time period in a folder
• Use a scripting language like Python or Bash to iterate through files in the folder

• Check the last modified timestamp of each file and compare it to the given time period

• Create a list of files that meet the criteria and display or output them
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Q2. How will you monitor if a system went down
Ans. 
I will use monitoring tools to receive alerts and notifications if a system goes down.
• Set up monitoring tools like Nagios, Zabbix, or Prometheus to track system health

• Configure alerts to be sent via email, SMS, or Slack when system goes down

• Implement automated scripts to restart services or systems if they fail

• Regularly check system logs for any error messages or warnings
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I was asked to design some classes and then extend the functionality to add more requirements while following SOLID principles

Q1. Reason for job change
Ans. 
Seeking new challenges and opportunities for growth
• Looking for a new challenge to expand my skills and knowledge

• Interested in working on cutting-edge technologies

• Seeking a more collaborative team environment

• Want to take on more leadership responsibilities
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Q2. Do you have any questions for us
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General aptitude questions will be asked

Q1. Salesforce.com technical questions will be asked
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Q1. Salary negotiation etc
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Q1. What is polymorphism
Ans. 
Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types or classes.

• Examples include method overloading and method overriding in object-oriented programming.
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Q2. Find missing number from nth number array.
Ans. 
Find missing number from nth number array.
• Iterate through the array and calculate the sum of all numbers

• Calculate the sum of numbers from 1 to n using the formula n*(n+1)/2

• Subtract the sum of array from the sum of numbers from 1 to n to find the missing number
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Q3. Explain inheritance and it types
Ans. 
Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.
• Inheritance allows a class to reuse code from another class.

• Types of inheritance include single inheritance, where a class inherits from only one parent class, and multiple inheritance, where a class inherits from multiple parent classes.

• Example: Class B inherits from Class A, so Class B can access
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Q4. Find 2nd max elements from aaray
Ans. 
Find 2nd max element from array of strings
• Sort the array in descending order

• Skip the first element (max element)

• Return the second element
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First round was a DSA round. Interviewers were helpful.

Q1. It was a technical round with the team lead.
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Coding as well as aptitude

Q1. Based on resume and projects
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Good and it was moderate

Q1. Asked about projects and related to that
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Q2. Asked few question about dsa
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