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Perfios Software Solutions Senior Technical Team Member Interview Questions and Answers
8 Interview questions
HTTPS provides secure communication over the internet using encryption, while HTTP does not.
HTTPS uses SSL/TLS encryption to secure data transmission, while HTTP does not.
HTTPS URLs begin with 'https://' and use port 443, while HTTP URLs begin with 'http://' and use port 80.
HTTPS ensures data integrity and authentication, while HTTP does not provide these security measures.
Implementing a palindrome check in Java without using the reverse() function.
Create a function that takes a string as input.
Use two pointers, one starting from the beginning of the string and the other from the end.
Compare characters at the two pointers and move them towards each other until they meet or cross.
If all characters match, the string is a palindrome.
Example: 'racecar' is a palindrome.
Example: 'hello' i...
Hash map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.
Hash map uses a hash function to determine the index of the key-value pair in the underlying array.
Collisions can occur when two keys hash to the same index, which can be resolved using techniques like chaining or open addressing.
Hash maps offer constant time complexity O(1) for insertion, de...
Use ORDER BY and LIMIT to get last entry in SQL query
Use ORDER BY column_name DESC to sort in descending order
Use LIMIT 1 to get only the last entry
Use counting method to sort array of strings with 0's and 1's.
Create a count array to store the frequency of 0's and 1's.
Update the original array based on the count array.
Example: Input array - ['0', '1', '0', '1', '1'], Output array - ['0', '0', '1', '1', '1']
Rotate an array of strings by n positions
Create a new array and copy elements from original array starting from index n to the end, then copy elements from index 0 to n-1
Alternatively, you can use array slicing to achieve the rotation
Example: Original array ['a', 'b', 'c', 'd', 'e'], rotate by 2 positions would result in ['c', 'd', 'e', 'a', 'b']
The algorithm to reverse a singly linked list involves iterating through the list and changing the pointers to reverse the direction of the links.
Start with three pointers: current, previous, and next.
Iterate through the list, updating the next pointer to point to the previous node.
Move the previous pointer to the current node and the current pointer to the next node.
Continue until the end of the list is reached, ...
SQL query to retrieve data from employee table
Use SELECT statement to retrieve data
Specify the columns you want to retrieve
Use FROM clause to specify the table name
Add any conditions using WHERE clause if needed
Perfios Software Solutions Senior Technical Team Member Interview Experiences
1 interview found
Anonymous
Selected
I appeared for an interview in Feb 2025.
(3 Questions)
- Q1. Given an array, how can you rotate it by n positions?
- Ans.
Rotate an array of strings by n positions
Create a new array and copy elements from original array starting from index n to the end, then copy elements from index 0 to n-1
Alternatively, you can use array slicing to achieve the rotation
Example: Original array ['a', 'b', 'c', 'd', 'e'], rotate by 2 positions would result in ['c', 'd', 'e', 'a', 'b']
- Q2. Prepare basic OOPS concepts
- Q3. Last entry of a table in sql query
- Ans.
Use ORDER BY and LIMIT to get last entry in SQL query
Use ORDER BY column_name DESC to sort in descending order
Use LIMIT 1 to get only the last entry
(2 Questions)
- Q1. Internal functioning of hash map
- Ans.
Hash map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.
Hash map uses a hash function to determine the index of the key-value pair in the underlying array.
Collisions can occur when two keys hash to the same index, which can be resolved using techniques like chaining or open addressing.
Hash maps offer constant time complexity O(1) for insertion, deletio...
- Q2. What is the implementation of a palindrome check in Java without using the reverse() function?
- Ans.
Implementing a palindrome check in Java without using the reverse() function.
Create a function that takes a string as input.
Use two pointers, one starting from the beginning of the string and the other from the end.
Compare characters at the two pointers and move them towards each other until they meet or cross.
If all characters match, the string is a palindrome.
Example: 'racecar' is a palindrome.
Example: 'hello' is not...
(4 Questions)
- Q1. Sorting arrays from 0's,1 in java , No sorting algorithm to be used Difficulty: Easy
- Ans.
Use counting method to sort array of strings with 0's and 1's.
Create a count array to store the frequency of 0's and 1's.
Update the original array based on the count array.
Example: Input array - ['0', '1', '0', '1', '1'], Output array - ['0', '0', '1', '1', '1']
- Q2. Difference between HTTP vs HTTPS indication
- Ans.
HTTPS provides secure communication over the internet using encryption, while HTTP does not.
HTTPS uses SSL/TLS encryption to secure data transmission, while HTTP does not.
HTTPS URLs begin with 'https://' and use port 443, while HTTP URLs begin with 'http://' and use port 80.
HTTPS ensures data integrity and authentication, while HTTP does not provide these security measures.
- Q3. What is the algorithm to reverse a singly linked list?
- Ans.
The algorithm to reverse a singly linked list involves iterating through the list and changing the pointers to reverse the direction of the links.
Start with three pointers: current, previous, and next.
Iterate through the list, updating the next pointer to point to the previous node.
Move the previous pointer to the current node and the current pointer to the next node.
Continue until the end of the list is reached, then ...
- Q4. Write a SQL query for employee table having
- Ans.
SQL query to retrieve data from employee table
Use SELECT statement to retrieve data
Specify the columns you want to retrieve
Use FROM clause to specify the table name
Add any conditions using WHERE clause if needed
Interview Preparation Tips
Top trending discussions
Interview questions from similar companies
I appeared for an interview in Mar 2025, where I was asked the following questions.
- Q1. Google photos system design
- Ans.
Designing Google Photos involves scalable storage, efficient image processing, and user-friendly features for photo management.
Scalable Storage: Use cloud storage solutions like Google Cloud Storage to handle vast amounts of user-uploaded photos efficiently.
Image Processing: Implement algorithms for image compression and optimization to reduce storage costs and improve loading times.
User Authentication: Secure user acc...
- Q2. Javascript basic questions
Interview Preparation Tips
I applied via Campus Placement and was interviewed in Apr 2024. There were 2 interview rounds.
Maintain a good communication to the hr
(5 Questions)
- Q1. Questions from your resume and projects
- Q2. Difference between elements and tags
- Ans.
Elements are individual components of a web page, while tags are used to define the structure and appearance of elements.
Elements are the actual components on a web page, such as headings, paragraphs, images, etc.
Tags are used to define the structure and appearance of elements, such as <h1> for a heading or <p> for a paragraph.
Elements can have multiple tags associated with them, such as <a> for a lin...
- Q3. Uses of functions in js
- Ans.
Functions in JavaScript are used to define reusable blocks of code that can be called multiple times.
Functions can be used to perform specific tasks or calculations.
Functions can be passed as arguments to other functions.
Functions can be assigned to variables or properties of objects.
Functions can be used to create closures for encapsulating data.
Functions can be used to create custom methods for objects.
- Q4. Uses of get elementbyId in js
- Ans.
getElementById is used in JavaScript to access and manipulate an element in the DOM by its unique ID.
Used to retrieve a specific element from the DOM by its ID
Allows for manipulation of the element's properties, styles, and content
Commonly used in event handling and dynamic content updates
- Q5. Typesof cssess ?
- Ans.
There are three types of CSS: inline, internal, and external.
Inline CSS is applied directly to an HTML element using the style attribute.
Internal CSS is defined within the head section of an HTML document using the style tag.
External CSS is stored in a separate file and linked to the HTML document using the link tag.
Interview Preparation Tips
Skills evaluated in this interview
Selected
I applied via Naukri.com and was interviewed in Jul 2023. There were 2 interview rounds.
(2 Questions)
- Q1. What is javascript?
- Ans.
JavaScript is a high-level, interpreted programming language that is used to make web pages interactive and dynamic.
JavaScript is commonly used for client-side web development.
It can be used to create interactive features like forms, animations, and dynamic content.
JavaScript can also be used for server-side development with Node.js.
- Q2. Types of variable in JavaScript
- Ans.
Types of variables in JavaScript include var, let, and const.
var: globally scoped or function scoped
let: block scoped, can be reassigned
const: block scoped, cannot be reassigned
Skills evaluated in this interview
I appeared for an interview before Apr 2024, where I was asked the following questions.
- Q1. JavaScript logics
- Q2. Angular structure
- Q3. HTML and CSS use to make form
- Ans.
HTML and CSS are essential for creating and styling web forms, enabling user input and interaction.
HTML provides the structure of the form using <form>, <input>, <label>, <textarea>, and <button> elements.
CSS is used to style the form elements, such as setting widths, margins, and colors.
Example of a simple form: <form><label for='name'>Name:</label><input type='text' ...
I applied via Approached by Company and was interviewed before Jun 2021. There were 2 interview rounds.
(1 Question)
- Q1. Advantage and disadvantage of framework.
- Ans.
Frameworks provide structure and pre-built components for software development, but can also limit flexibility and require learning curve.
Advantage: Provides structure and pre-built components for faster development
Advantage: Can improve code quality and maintainability
Disadvantage: Can limit flexibility and customization
Disadvantage: Requires learning curve and potential dependency issues
Example: ReactJS provides a fr...
(1 Question)
- Q1. What is Oops? Advantage and disadvantage
- Ans.
Oops stands for Object-Oriented Programming. It is a programming paradigm that uses objects to represent real-world entities.
Advantages: code reusability, modularity, encapsulation, inheritance, polymorphism
Disadvantages: complexity, steep learning curve, performance overhead
Example: creating a class 'Car' with properties like 'make', 'model', and 'year', and methods like 'start_engine' and 'stop_engine'
Interview Preparation Tips
Skills evaluated in this interview
Rohit Kr Shaw
I applied via Naukri.com and was interviewed before Sep 2021. There was 1 interview round.
(1 Question)
- Q1. Basic Oracle Architecture, RAC Setup, Golden Gate Troubleshooting, Data Guard recover, RMAN restoration
Interview Preparation Tips
I applied via Company Website and was interviewed before Jul 2020. There were 3 interview rounds.
Interview Questionnaire
2 Questions
- Q1. Scrum
- Q2. Agile
Interview Preparation Tips
Interview Questionnaire
2 Questions
- Q1. Algorithm and Trick questions on Java
- Q2. Your future interest, interaction capabilities
Interview Preparation Tips
Experience: Mention only those projects/works which you feel fully confident on, let any question be thrown your way.
Believe me, a simple project explained in a good way is better than a complex project that scares you going into the details.
Tips: A little bit of extra activities (sports/music) helps them picture you as not a total nerd, which might help in front of some interviewers.
Round: Interview
Experience: They will mostly try to trick you here, even if you are right, they will make you doubt yourself. It's just about believing oneself and answering in one go.
Tips: Stick to your answers if you feel it's right, changing it again and again won't do you much good.
Round: Interview
Experience: This is where you have to be most careful, what they seek is just your interest in the company or infact passion for their work and not leaving them mid-way for higher studies or startup plans.
Tips: Diverting talks to some extra-currics might help a lot here specially if they have interest in that too, like the one, I was giving interview to, was wearing a Barcelona cap and I had mentioned that I played football at Inter-Hostel level. So we talked about the recent Premier league for like 10 minutes and the mood was really lightened, thanks to that.
General Tips: It is never too late to be what you might have been.
Skills: Algorithms, Java, Interaction Skills, coding, C, C++
College Name: IIT DELHI
Motivation: The technology (Social-Media Management) they are working on is really interesting to know more about and can be a future pioneer in the coming days.
Funny Moments: One of the interviewer I became so friendly with, mid-way through the interview that we added each other right there on facebook.
Interview Preparation Tips
Experience: They asked to write 2 codes on recursion. Then some questions on resume. I asked them about the job profile and after knowing that they were hiring candidates for frontend programming, about which they didn’t mention in JAF. I told them that I was not interested in frontend development. And didn’t even answer any question after that. Unfortunately, I was selected.
General Tips: Plan your schedule judiciously keeping your capacity in mind. There is no point of making ideal plans and then not able to do even 50% of it.
Don’t get into unnecessary arguments or debate with people.
Don’t think about what others are doing. Focus on your preparation.
How you carry yourself matters. So, make sure you portray yourself in the way you want the other person to perceive you.
Be selective while applying for companies.
College Name: IIT Kanpur
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Perfios Software Solutions Senior Technical Team Member Reviews and Ratings
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Rating in categories
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Senior QA Engineer
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|  ₹10 L/yr - ₹15 L/yr |
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Software Developer
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| ₹5.8 L/yr - ₹12 L/yr |
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Software Development Engineer
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Senior Software Development Engineer
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| ₹12.1 L/yr - ₹31.9 L/yr |
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