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Fiserv Software Development Engineer 3 Interview Questions and Answers
6 Interview questions
Query to delete duplicate records from a table
Use GROUP BY to group the records by the columns that define duplicates
Use HAVING to filter out groups with count greater than 1
Use DELETE to remove the duplicate records
User defined exceptions can be defined by creating a new class that extends the Exception class.
Create a new class that extends the Exception class
Add constructors to the class to initialize the exception
Throw the exception using the 'throw' keyword
Procedure is a set of instructions that performs a specific task, while function returns a value after performing a specific task.
Procedure does not return a value, while function returns a value
Procedure can modify the values of input parameters, while function cannot
Functions can be called from within a procedure, but procedures cannot be called from within a function
Rownum is a pseudocolumn in Oracle that assigns a unique number to each row returned by a query.
Rownum starts with 1 and increments by 1 for each row returned by the query.
The expression Rownum > 4 is correct and will return all rows with a Rownum greater than 4.
Rownum can be used to limit the number of rows returned by a query, for example, 'SELECT * FROM table WHERE Rownum <= 10'.
Defining and using a parameterized cursor in PL/SQL
Declare a cursor variable with parameters
Open the cursor using the OPEN statement and pass in the parameter values
Fetch rows from the cursor using the FETCH statement
Close the cursor using the CLOSE statement
Triggers are database objects that execute automatically in response to certain events. Mutating trigger problem occurs when a trigger tries to read or modify a table that is already being modified by the same transaction.
Triggers can be used to enforce business rules, audit changes, and maintain referential integrity.
They can be used to automatically update a table when a related table is updated.
Mutating trigger...
Fiserv Software Development Engineer 3 Interview Experiences
1 interview found
Anonymous
I applied via Naukri.com and was interviewed before Aug 2020. There were 5 interview rounds.
Interview Questionnaire
6 Questions
- Q1. How to define a parameterized cursor in PLSQL , how to open and close it
- Ans.
Defining and using a parameterized cursor in PL/SQL
Declare a cursor variable with parameters
Open the cursor using the OPEN statement and pass in the parameter values
Fetch rows from the cursor using the FETCH statement
Close the cursor using the CLOSE statement
- Q2. Write a query to delete duplicate records from a table
- Q3. What is Rownum ? Is expression Rownum >4 correct ?
- Ans.
Rownum is a pseudocolumn in Oracle that assigns a unique number to each row returned by a query.
Rownum starts with 1 and increments by 1 for each row returned by the query.
The expression Rownum > 4 is correct and will return all rows with a Rownum greater than 4.
Rownum can be used to limit the number of rows returned by a query, for example, 'SELECT * FROM table WHERE Rownum <= 10'.
- Q4. What is the difference between procedure and function
- Ans.
Procedure is a set of instructions that performs a specific task, while function returns a value after performing a specific task.
Procedure does not return a value, while function returns a value
Procedure can modify the values of input parameters, while function cannot
Functions can be called from within a procedure, but procedures cannot be called from within a function
- Q5. What are triggers , where can they be used ? What is a mutating trigger problem , how can it be solved?
- Ans.
Triggers are database objects that execute automatically in response to certain events. Mutating trigger problem occurs when a trigger tries to read or modify a table that is already being modified by the same transaction.
Triggers can be used to enforce business rules, audit changes, and maintain referential integrity.
They can be used to automatically update a table when a related table is updated.
Mutating trigger prob...
- Q6. How to define user defined exceptions ?
- Ans.
User defined exceptions can be defined by creating a new class that extends the Exception class.
Create a new class that extends the Exception class
Add constructors to the class to initialize the exception
Throw the exception using the 'throw' keyword
Interview Preparation Tips
Skills evaluated in this interview
Top trending discussions
Interview questions from similar companies
I applied via Company Website and was interviewed before Jan 2021. There were 3 interview rounds.
(2 Questions)
- Q1. Pl sql Unix api configuration
- Q2. Routing how to use proxy
- Ans.
Routing through a proxy involves configuring the proxy server to forward requests to the destination server.
Configure the proxy server to listen for incoming requests
Configure the proxy server to forward requests to the destination server
Configure the client to use the proxy server for outgoing requests
Use a proxy server to bypass network restrictions or improve performance
Examples: Nginx, Apache, Squid
Interview Preparation Tips
Skills evaluated in this interview
Pranav Bhat Thirthahalli
Interview Questionnaire
14 Questions
- Q1. What is race condition and how can it be eliminated
- Ans.
Race condition is a situation where multiple threads/processes access and manipulate shared data simultaneously.
It can be eliminated by using synchronization techniques like locks, semaphores, and mutexes.
Another way is to use atomic operations that ensure the data is accessed and modified atomically.
Using thread-safe data structures can also prevent race conditions.
Example: Two threads trying to increment a shared var...
- Q2. What is JCube?
- Ans.
JCube is a Java library for creating and manipulating Rubik's Cube puzzles.
JCube provides classes for representing Rubik's Cube puzzles and algorithms for solving them.
It supports various cube sizes and can generate random scrambles.
JCube can be used in Java applications or as a standalone command-line tool.
It is open source and available on GitHub.
- Q3. What is regression testing?
- Ans.
Regression testing is the process of testing changes made to a software application to ensure that existing functionality still works.
It is performed after making changes to the software
It ensures that existing functionality is not affected by the changes
It helps to catch any defects or bugs that may have been introduced
It can be automated using testing tools
Examples include retesting after bug fixes, testing after new...
- Q4. Discussion on different sorting techniques
- Q5. Discussion on SQL and SQL optimisaion
- Q6. Software engineering principles
- Ans.
Software engineering principles are the best practices and guidelines for developing high-quality software.
Software should be designed with modularity and scalability in mind.
Code should be well-documented and easy to read.
Testing and debugging should be an integral part of the development process.
Version control should be used to manage code changes.
Security and privacy should be considered throughout the development ...
- Q7. Java and OOP's question
- Q8. Define Singleton class
- Ans.
A Singleton class is a class that can only have one instance at a time.
It restricts the instantiation of a class to a single object.
It provides a global point of access to that instance.
It is often used in situations where a single object is required to coordinate actions across a system.
Example: Database connection manager, Configuration manager, Logger manager.
- Q9. Explain Testing principles and Design principles
- Ans.
Testing principles ensure software quality, while design principles guide software development.
Testing principles include unit testing, integration testing, and acceptance testing.
Design principles include SOLID, DRY, and KISS.
Testing principles ensure that software meets requirements and is free of defects.
Design principles guide software development to be modular, maintainable, and scalable.
- Q10. Types of machine learning and methods and examples, they may give you a situation and ask you which technique is good and why
- Q11. Why choose you for VISA?
- Ans.
I have the necessary skills, experience, and passion to contribute to VISA's success.
I have a strong background in software development and have worked on projects similar to those at VISA.
I am a quick learner and can adapt to new technologies and programming languages easily.
I am passionate about creating high-quality software that meets the needs of users and exceeds their expectations.
I am a team player and can work...
- Q12. Which profile is good for you?
- Ans.
A profile that challenges me to learn and grow while allowing me to contribute to a team.
A position that encourages continuous learning and development
A role that allows me to collaborate with a team and contribute to projects
A company culture that aligns with my values and work ethic
- Q13. About the work culture at VISA Inc
- Q14. If u already have a placement, why this company
- Ans.
I am interested in exploring new opportunities and challenges that this company can offer.
I am impressed with the company's reputation and growth potential.
I am excited about the projects and technologies this company is working on.
I believe this company can provide me with a better work-life balance and career growth opportunities.
I am looking for a company culture that aligns with my values and goals.
I am open to exp...
Interview Preparation Tips
Experience: Online Test on mettl.com
- 2 coding questions ( 15*2 = 30 marks ) - Moderate level
- 10 MCQs on Programming and Java ( 1*10 = 10)
- 6 MCQs on Machine Learning and Hadoop ( 1*6 = 6 )
- 6 MCQs on Computer Networks ( 1*6 = 6 )
- 6 MCQs on Computer Infrastructure and Architecture ( 1*6 = 6)
- 6 MCQs on Application security and Cryptography ( 1*6 = 6)
15 shortlisted from here including 8 B.Techs and 7 M.Techs for F2F interviews, which were taken by VISA employees from their US and Singapore offices( since they don't have any office at India ).
Round: Technical Interview
Experience: They may give you a situation and ask you to explain which Software engineering principles will you use. They ask you how will you explain the concept of stacks and queues to a 7 year old, or to a granny, so as to encourage programming(like seriously ? )
General Tips: Nothing as such, since this was my second on-campus placement, I had good experience of interviews.
Keep your fundamentals in all computer science subjects open. Unlike other companies they don't focus much on coding alone. The only other company which also looks at perfection in all computer science aspects is Xerox Research Center India.
Challenging and Equally rewarding, but seriously a unique experience with no much tension
Skills:
College Name: NIT Surathkal
Skills evaluated in this interview
Interview Questionnaire
7 Questions
- Q1. Discussion on my internships and course projects.
- Q2. My field of interest, how well have I fared in it.
- Q3. Design a mvc controller system where given a url, I am able to invoke the right controller. Eg, given "xyz.com/a/b/c", I should be able to invoke c controller by going through a and b
- Ans.
Design an MVC controller system to route URLs to the appropriate controllers based on the URL structure.
Define a routing mechanism that maps URLs to controller actions.
Use a hierarchical structure where each segment of the URL corresponds to a controller.
Example: For 'xyz.com/a/b/c', 'a' routes to 'AController', 'b' to 'BController', and 'c' to 'CController'.
Implement a method to parse the URL and invoke the correspond...
- Q4. Design autocomplete in IDEs
- Ans.
Autocomplete in IDEs helps developers write code faster by suggesting code snippets and completing code as they type.
Autocomplete should suggest code snippets based on the context of the code being written
Autocomplete should prioritize suggestions based on frequency of use
Autocomplete should also suggest variable and function names
Autocomplete should be customizable to allow for user-defined snippets and suggestions
Exa...
- Q5. What is my weakness
- Ans.
My weakness is public speaking.
I tend to get nervous when speaking in front of large groups.
I am working on improving my public speaking skills by practicing and seeking feedback.
I have taken courses and attended workshops to help me overcome my fear of public speaking.
- Q6. Given 2 game scenarios for basketball, and given p as the probability of making a basket in an attempt, I have to understand the condition where game1 would be preferable over game2. In first game, I have ...
- Ans.
Comparing 2 basketball game scenarios with different number of trials and baskets required to win
Calculate the probability of winning in each game scenario using binomial distribution formula
Compare the probabilities to determine which game scenario is preferable
In game1, the probability of winning is p. In game2, the probability of winning is the sum of probabilities of making 2 or 3 baskets
If p is high, game1 is pref...
- Q7. Given a dictionary of words, I have to go from one word to another in least number of transitions where a transition is a defined as changing any letter of the current word such that the new word is also i...
Interview Preparation Tips
Experience: The test was on hackerrank.
Tips: * Fast coding and problem solving required
* Time crunch
* The test is valued a LOT in the hiring process
Duration: 120 minutes
Total Questions: 4
Round: Technical Interview
Experience: Question 1 : He tried to take the discussion to web based technologies to which I straightly told I don’t know. Not sure if that was a good decision. Nevertheless, he went over my resume a lot of times and asked about various projects.
Question 2 : Discussed the various projects related to it.
Question 3 : He asked this question because I had worked on django during my FB internship. I proposed a tree based structure. xyz.com/a/b/c ---> b is child of a, c is child of b.
Question 4 : Next he moved to a very interesting question. Given a simple text editor, I want to facilitate autocomplete feature. We discussed about syntactic methods using language specific keywords. I suggested a trie based implementation which he liked. Later he asked me to improve and redirected me to using scope of the variables, and grammar of the language. We discussed about all the steps I did in language translators lab (macrojava -> minijava -> typechecking -> miniIR -> microIR -> miniRA ->Mips) where we built a Java compiler in Java. We later hopped back to original question and I suggested that we can use grammar to to store multiple (nested kind of) tries for different scope. He asked me how would I define “scope”. He gave me a scenario which helped me come up with the nested trie structure
int a;
{
int b;
{
int c; //a b c can be used
}
{
int d; //a b d can be used
}
}
He then asked me details of how I would code. I said we could use the respective visitors and maintain the current trie root for scope. He liked it but I missed at 2 places :
1. He asked me about token generation used in a compiler and I said flex and bison. I was expected to elaborate a bit.
2. He asked me how the grammar is generated and how the visitors are invoked. I couldn’t explain properly because I was not thorough with it.
Tips: * Keep smiling in the interviews.
* My interviewer had hopped from Microsoft to Visa. We had a short detailed discussion on how the transition was and what drove him to do that.
* It’s always good to know about the company to pick up interesting discussions, read up latest articles and news
* The interviewers want to see if you are passionate about what they are building. Their PPT (Pre Placement Talk) was also focussed majorly on the technologies they are building.
* If you take a question in a direction, make sure you are very very thorough with it. I took it in the direction of compilers, but couldn't make the transition seamlessly because I wasn't thorough with a lot of things (like token generation, visitor invocation).
* Not sure if telling upfront that you don't know about web technologies when you are applying for a profile that might need it is a good idea or not.
Round: Technical Interview
Experience: I think he was a senior person and spoke very passionately about the work that is happening in visa Bangalore office.
Question 1 : I said maybe I should have learnt a little about web based technologies. I think he was looking for a more generic answer.
Question 2 : I went ahead with calculating the expected score where my score random variable = 1 with probability p, and 0 with probability (1-p). I conditioned that expected score of game1 > game2 which would give me the range of p. I goofed up the equations twice but he said he liked my approach and I was just there
Question 3 : I suggested building a graph where a node is a word and an edge means a transition, and then performing BFS. He said that was obvious and that he was more interested in knowing how I build the graph. I suggested a method to reduce the number of string comparisons by storing a count vector with each word. Count vector is a 26 length vector where count[i] = number of times that letter occurs in the word. I would do string comparison to identify neighbours only if the difference in count vectors in 2. Eg, cot = cat - a + o. String comparison is still needed because of false positives. Eg, oct = cat - a + o but cat -> oct is not a valid transition. He liked my approach and asked me to code, discussed the complexity.
Tips: * Don't be naive around a senior engineer. Be confident.
* Explain your approach before going ahead solving it. I missed that in Q1 and for a long time he didn't know what I was heading towards.
* Write clean code, practice coding on paper to make sure you write compilable code. Shabby code is a turn off.
* Show passion for the company you are applying for.
General Tips: * Be friendly and keep smiling.
* Know about the company, well in detail. Recent news, articles, acquisitions, organisational changes, new offices, new product, etc.
* Know about the volume the company handles, certain mind boggling figures, what the company *does not* do
* If you are introducing yourself as an expert in a certain field, be prepared for questions like "How will you contribute to our company with your expertise" type of questions.
* Be very very thorough with every single thing you write on your resume. A small point you weren't sure about might become the basis of your whole interview. Don't write things you are unsure of, or have worked very little on.
Skill Tips: * I think I didn’t take Visa very seriously. I was assuming they won’t take a undergrad and they won’t take me because I have 0 knowledge in web based technologies. I might have acted a little cocky.
* They had nice pie diagrams which shows that they had done thorough research about each and every candidate based on resume and the coding test.
* They value the coding test a lot.
* Be very thorough with the projects you write on resume. They will give you a problem which won't be straightforward and will map onto one of your course projects. You are expected to do the mapping seamlessly. Every bit of the discussion you have with the interviewer can be your next problem.
* Brush up on web based technologies if you can.
* There will be a HR round as well if you clear the technical interviews.
Skills: Maths(esp Probability), Design, Passion, Web Technologies, Technical Skill And Speaking Skill, Coding Skills
College Name: IIT Madras
Motivation: * Been the leader since more than half a century, been through the technological revolution.
* Revolutionising payments architecture. Building something of greatest need, so elegant and optimised, yet producing such consistent performance.
* Keeping up with the need of the generation by introducing features which are brand new. Eg, “all-purpose credit card”.
* Loved their PPT (Pre Placement Talk). Volume of the data and processing is IMMENSE. Billions of transactions in a year voluming up to trillions. More than 200 countries in the world --> these stats are HUGE.
* Fraud detection is a space I would have loved to work on given that I come from a Data Mining background.
Funny Moments: Chucked out before HR round :P
Skills evaluated in this interview
Interview Questionnaire
2 Questions
- Q1. Why would you like to join Visa and why?
- Ans.
I want to join Visa to contribute to innovative payment solutions and be part of a global leader in financial technology.
Visa is at the forefront of digital payment innovation, allowing me to work on cutting-edge technologies.
The company's commitment to security aligns with my passion for developing secure software solutions.
Visa's global presence offers opportunities to collaborate with diverse teams and learn from di...
- Q2. Tell me about yourself
- Ans.
I'm a passionate software engineer with a strong background in full-stack development and a love for problem-solving.
Graduated with a degree in Computer Science from XYZ University.
Worked at ABC Corp, where I developed a web application that improved user engagement by 30%.
Proficient in languages like JavaScript, Python, and Java, with experience in frameworks like React and Django.
Enjoy collaborating in agile teams an...
Interview Preparation Tips
Experience: Coding Questions were fairly standard ones.
Duration: 75 minutes
Total Questions: 42
Round: Interview
Experience: Networks based questions, firewalls, TCP/IP and other OSI layers
Round: Interview
Experience: Coding questions. Asked to code on paper. Questions on Object Oriented Design.
Skills: Networks basics, OOPs basics, Coding Skills
College Name: IIT Guwahati
Motivation: Profiles offered, Package, Location
Interview Preparation Tips
Experience: Questions on
1. Programming: 10 Questions2. Machine Learning Hadoop MCQ: 6 Questions3. Networking MCQ: 6 Questions4. Operating System: 6 Questions5. Infrastructure: 6 Questions6. Application Security: 6 Questions
Tips: Questions were simple , except sections 2,5 unless you have a basic idea about it.
Duration: 75 minutes
Total Questions: 34+2
Round: Technical Interview
Experience: – Projects, Internship– Asymmetric and Symmetric encryption with some real world usage– Concepts behind Digital Signature and Digital Certificates– Detailed discussion on HTTPS– Basic OS concepts : Threads, Mutex , Semaphores– Basic OOPS concepts : Virtual functions , Function overloading and overriding , encapsulation.
Tips: Focus on Network Security concepts !
Round: Technical Interview
Experience: – Projects , Internship– Some discussion on Testing and how you would design a unit test case and a complete project test case. Discussion on Automated Testing.– How does a Web application work.– Software Development Models– Discussion on interpreted language and compiled language– Some DBMS basics for efficiency :- Indexing viz. B+trees , Hashing.– Some discussion on Apple Pay , VbV (Verified by Visa) (informal)
Round: HR Interview
Experience: Basic HR questions !
General Tips: Confidence is the key along with sufficient coding practice both on the IDE and pen-paper.
Skills: Network Security, Programming, Algorithms, Operating System
College Name: IIT ROORKEE
I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.
Interview Questionnaire
7 Questions
- Q1. Given an array, Implement Binary search tree
- Ans.
Implement Binary Search Tree using given array of strings.
Sort the array in ascending order
Find the middle element and make it the root of the tree
Recursively create left and right subtrees using the left and right halves of the array
Repeat until all elements are added to the tree
- Q2. Given the above Binary search tree, print in ascending order
- Ans.
Print the given Binary search tree in ascending order
Traverse the left subtree recursively
Print the root node
Traverse the right subtree recursively
- Q3. Given an array of stock prices, find where to buy and where to sell for maximum profit in O(n)
- Q4. Resume based
- Q5. What are three problems Chennai faces?
- Ans.
Chennai faces problems related to water scarcity, traffic congestion, and pollution.
Water scarcity due to inadequate rainfall and poor management of water resources.
Traffic congestion due to the increasing number of vehicles and poor road infrastructure.
Pollution caused by industries, vehicular emissions, and improper waste disposal.
- Q6. Which one would you solve and how and why?
- Ans.
Need more context on the question to provide an answer.
Please provide more information on the problem to be solved.
Without context, it is difficult to provide a solution.
Can you please provide more details on the problem statement?
- Q7. What is most interesting thing about Visa?
Interview Preparation Tips
Experience: 4 Coding questions on Hackerrank platform, one and half hour time. I am not going to reveal the questions here, but one was a basic binary tree implementation and the other three were algorithmic and mathematical problems. They were kinda hard to solve in an hour and half. I could do only 1 and half of the other one. I got 115/300 points on that. I was one of the 16 people selected for the interview.
Tips: It all depends on how well you can focus on the test day. Just practice a lot on hackerrank.
Duration: 1 hour 30 minutes
Total Questions: 4
Round: Technical Interview
Experience: The first two questions I was able to do fast enough. I was also asked a few questions on my resume and coding-related internship. The last one, I showed an O(n*n) algorithm first and then modified it to O(n). Around 45 minutes.
Tips: Be thorough on the coding part in your resume. Think out aloud!
Round: Technical + HR Interview
Experience: Just a few normal questions regarding my projects and my favorite course and it's application to Visa. 15 minutes.
Tips: Once again, be thorough on your resume.
Round: HR Interview
Experience: Once again a normal round, just random questions as to whether I am interested and good enough in communication. 15 minutes.
Tips: Don't get shaken. Be ready for all kinds of questions. Especially about Visa relation to what you do
Skills: Smart Coding
College Name: IIT Madras
Skills evaluated in this interview
Interview Questionnaire
1 Question
- Q1. Tell me about your project ( written in language)?
- Ans.
Developed a web application using Python and Django framework for managing inventory and sales.
Used Python programming language for backend development
Implemented Django framework for building web application
Designed database schema for inventory and sales data
Integrated frontend using HTML, CSS, and JavaScript
Implemented user authentication and authorization features
Interview Preparation Tips
Experience: They asked 3 question on data structures .
1.Merging linekd list
2 and 3 BST related
Duration: 1 hour
Total Questions: 3
Round: Technical Interview
Experience: Interviewer asked me to explain projects which I had mentioned in Resume. Then He asked me to implement a problem on basis of my project.
It was telephonic round.
CGPA and my project mattered.
College Name: IIT Roorkee
Arpan Paul
I applied via Campus Placement and was interviewed in Sep 2016. There were 4 interview rounds.
Interview Questionnaire
7 Questions
- Q1. Tell me about yourself
- Ans.
I am a passionate software developer with experience in Java, Python, and web development.
Experienced in Java, Python, and web development technologies
Strong problem-solving skills
Team player with excellent communication skills
- Q2. Explain your resume
- Ans.
My resume highlights my experience in software development and showcases my skills in various programming languages and technologies.
Worked on multiple projects using Java, Python, and C++
Developed web applications using HTML, CSS, and JavaScript
Experience with databases such as MySQL and MongoDB
Familiarity with Agile methodology and version control systems like Git
Participated in hackathons and coding competitions
- Q3. Questions on projects mentioned
- Q4. Why do you want to go for VISA?
- Ans.
I want to go for VISA to explore new opportunities and gain international experience.
To gain exposure to different cultures and work environments
To expand my skill set and learn new technologies
To work on challenging projects and contribute to the growth of the company
To build a global network of professionals and enhance my career prospects
- Q5. Code a basic binary tree
- Ans.
A binary tree is a data structure in which each node has at most two children.
Start with a root node
Each node has a left and right child
Nodes can be added or removed
Traversal can be done in-order, pre-order, or post-order
- Q6. Code a basic linked list
- Ans.
Code a basic linked list
Create a Node class with data and next pointer
Create a LinkedList class with head pointer
Implement methods to add, delete, and search nodes in the linked list
- Q7. Code a circular linked list
- Ans.
A circular linked list is a data structure where the last node points back to the first node, forming a loop.
Create a Node class with data and next pointer
Initialize the head node and set its next pointer to itself
To add a node, create a new node and set its next pointer to the head node's next pointer, then update the head node's next pointer to the new node
To traverse the circular linked list, start from the head nod...
Interview Preparation Tips
Experience: It was a programming test hosted on hackerrank. A total of 3 questions. I could solve only one of them. That too only a few test cases. Still got shortlisted for the next round. :)
Tips: Do practice a few challenges on programming platforms. Brush up your programming knowledge.
Total Questions: 3
Round: Technical Interview
Experience: It was an HR cum Technical round for me as I came from a non CS background. I was able to convince them I am a perfect fit for VISA
Tips: Do prepare your resume well. If you have coding projects, make sure you are clear with whatever you write. They might quiz you hard on them. Strong knowledge on Data structures and Algorithms will give you an edge.
Skills: Presentation Of Facts In Resume, Basic Coding, Communication, Algorithms And Data Structures
Duration: 2
College Name: IIT Madras
Funny Moments: I am a part of the sponsorship team of our technical and VISA was an associate sponsor for the same the previous year. Hence I had specified this fact in my interview. :P
Skills evaluated in this interview
I appeared for an interview before Apr 2021.
(4 Questions)
Round duration - 45 minutes
Round difficulty - Easy
This was a technical interview round.
- Q1. How does AJAX work?
- Ans.
AJAX allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes.
AJAX stands for Asynchronous JavaScript and XML.
It allows web pages to update content without reloading the entire page.
AJAX uses XMLHttpRequest object to send and receive data from a server.
Commonly used in web applications to provide a more responsive user experience.
- Q2. What is the difference between SOAP and REST?
- Ans.
SOAP is a protocol, while REST is an architectural style for web services.
SOAP is a protocol that uses XML for message format and relies on a request-response model.
REST is an architectural style that uses standard HTTP methods like GET, POST, PUT, DELETE.
SOAP is more rigid and requires more bandwidth, while REST is lightweight and flexible.
SOAP has built-in security features like WS-Security, while REST relies on exte...
- Q3. What is the difference between GET and POST methods in APIs?
- Ans.
GET is used to request data from a server, while POST is used to submit data to a server.
GET requests data from a specified resource, while POST submits data to be processed to a specified resource.
GET requests are cached by browsers, while POST requests are not.
GET requests can be bookmarked and shared, while POST requests cannot.
GET requests have length restrictions, while POST requests do not.
Example: Using GET to r...
- Q4. What is the Observer Pattern?
- Ans.
The Observer Pattern is a behavioral design pattern where an object (subject) maintains a list of dependents (observers) that are notified of any state changes.
Allows for one-to-many dependency between objects
When the subject's state changes, all observers are automatically notified and updated
Commonly used in event handling systems and GUI frameworks
(4 Questions)
Round duration - 40 minutes
Round difficulty - Easy
This was the second technical interview round.
- Q1. What is a singleton class?
- Ans.
A singleton class is a class that can only have one instance created throughout the entire application.
Singleton classes have a private constructor to prevent multiple instances from being created.
They typically provide a static method to access the single instance.
Commonly used for logging, database connections, and configuration settings.
- Q2. What is meant by immutability in Java?
- Ans.
Immutability in Java refers to the property of objects whose state cannot be changed once they are created.
Immutability ensures that once an object is created, its state cannot be modified.
Immutable objects are thread-safe and can be shared without the risk of data corruption.
String class in Java is an example of an immutable class.
To create an immutable class, make the class final, all fields private, and provide only...
- Q3. What is dependency injection?
- Ans.
Dependency injection is a design pattern where components are given their dependencies rather than creating them internally.
Allows for easier testing by providing mock dependencies
Promotes loose coupling between components
Improves code reusability and maintainability
Examples: Constructor injection, Setter injection, Interface injection
- Q4. How do you create an immutable class in Java?
- Ans.
To create an immutable class in Java, make the class final, make all fields private and final, provide only getter methods, and do not provide any setter methods.
Make the class final to prevent inheritance.
Make all fields private and final to prevent modification.
Provide only getter methods to access the fields.
Do not provide any setter methods to modify the fields.
Round duration - 30 minutes
Round difficulty - Easy
HR round with typical behavioral problems.
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
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