Razorpay Software Development Engineer Intern Interview Questions and Answers

Q1. Deep dive into java concepts. Max diameter of a tree in java.
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Q1. Lld of loan and borrower design. Design dbs schema. About connection pool, db isolation.
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Q1. Hiring manager round, more about previous experience and some hypothetical questions.
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Q1. Explain the react lifecycle functions and how they work
Ans. 
React lifecycle functions are methods that are automatically called at specific points in a component's life cycle.
• Mounting: constructor, render, componentDidMount

• Updating: render, componentDidUpdate

• Unmounting: componentWillUnmount
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Q2. Css box model, difference between padding and margin
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Padding is the space inside the border of an element, while margin is the space outside the border.
• Padding is used to create space between the content and the border of an element.

• Margin is used to create space between the border of an element and other elements.

• Padding affects the size of the content area, while margin affects the positioning of the element.

• Example: padding: 10px will create 10 pixels of space inside ...read more
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Q1. What are your salary expectations in CTC and variables?
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Q2. Will you relocate to the location required?
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Write code for advance surrying in js

Implement custom hook for api call

Q1. Basic questions arounf my previous work
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Q2. Technical questions around performance and code optimization
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Basic puzzles of medium complexity level. No improvement required

DSA questions of easy level. Asked for memory optimisations.

Q1. High level system design of wallet payment system, took example of paytm. This was hld questions so just basic components
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Q1. Low level system design of parking lot system
Ans. 
Design a parking lot system at a low level
• Divide system into components like parking spots, ticketing system, payment system

• Implement data structures like queues for managing parking spots

• Use algorithms like least recently used for spot allocation

• Consider scalability and performance in design
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Q2. Review of one of my projects at past company
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75 min test with 18 Java theory questions

Q1. Synchronized keyword usage
Ans. 
The synchronized keyword in Java is used to control access to shared resources in a multithreaded environment.
• Synchronized keyword can be used to synchronize access to critical sections of code to prevent race conditions.

• It can be applied to methods or code blocks to ensure only one thread can access them at a time.

• Example: synchronized void myMethod() { // code }

• Example: synchronized(this) { // code }
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Q2. Message Queue types
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Q3. Thread Contention
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Q4. Java Profiling Tools
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Q5. Abstract classes
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1 hour, the coding test was based on a project given to us

Q1. Detailed questionnaire on React
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Q2. Problem solving based on array manipulations
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Q1. What is collection framework?
Ans. 
Collection framework is a unified architecture for representing and manipulating collections of objects in Java.
• It provides interfaces (like List, Set, Map) and classes (like ArrayList, HashSet, HashMap) to store and manipulate groups of objects.

• It allows for easy manipulation, sorting, searching, and iteration of collections.

• Collections in the framework can store objects of any type, including user-defined classes.

• Exa...read more
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Q2. What is spring boot dependency injection?
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Spring Boot dependency injection is a design pattern where objects are passed their dependencies rather than creating them internally.
• In Spring Boot, dependency injection is achieved through the use of @Autowired annotation.

• It helps in achieving loose coupling between classes and promotes easier testing and maintenance.

• Example: @Autowired private UserService userService; // Injecting UserService dependency
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Q3. What is the use of rate limiter?
Ans. 
Rate limiter is used to control the rate of incoming requests to a server or API.
• Prevents server overload by limiting the number of requests a client can make in a specific time period

• Helps protect against DDoS attacks by limiting the rate of incoming requests

• Ensures fair usage of resources by preventing one client from monopolizing server resources

• Can be implemented using algorithms like token bucket or leaky bucket

• Ex...read more
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Q4. What is the mean by thread, how many ways we can create thread?
Ans. 
A thread is a lightweight sub-process that allows concurrent execution within a process. Threads can be created in multiple ways.
• Threads can be created by extending the Thread class in Java.

• Threads can be created by implementing the Runnable interface in Java.

• Threads can be created using thread pools in Java.

• Threads can be created using asynchronous functions in JavaScript.
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Q5. What is use of thread.join()?
Ans. 
thread.join() is used to wait for a thread to finish its execution before moving on to the next steps.
• thread.join() blocks the current thread until the thread it is called on completes its execution.

• It is commonly used in multi-threaded applications to ensure that all threads have finished before proceeding.

• Without thread.join(), the main thread may continue executing while other threads are still running.

• Example: thre...read more
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Q6. What is the difference between sync and asynchronous call?
Ans. 
Sync call blocks the execution until the response is received, while asynchronous call allows the program to continue executing without waiting for the response.
• Sync call blocks the program execution until the response is received

• Asynchronous call allows the program to continue executing without waiting for the response

• Sync calls are easier to understand and debug, but can lead to performance issues if used excessively

• ...read more
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Q7. How to deploy your service in production server?
Ans. 
Deploying service in production server involves building the application, configuring the server, and monitoring performance.
• Build the application code into a deployable package (e.g. JAR file for Java applications)

• Configure the production server with necessary dependencies and environment variables

• Deploy the application package to the server using tools like Docker, Kubernetes, or manual deployment scripts

• Monitor the ...read more
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Q8. What is use of Jenkins and kubernates?
Ans. 
Jenkins is a continuous integration tool used for automating software development processes, while Kubernetes is a container orchestration platform for managing containerized applications.
• Jenkins is used for automating the building, testing, and deployment of software projects.

• Kubernetes helps in automating the deployment, scaling, and management of containerized applications.

• Jenkins can be integrated with Kubernetes t...read more
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Q9. What is the difference between fail safe and fail fast
Ans. 
Fail safe focuses on ensuring system stability and preventing catastrophic failures, while fail fast prioritizes quick detection and response to errors.
• Fail safe is about designing systems to minimize the impact of failures and ensure stability.

• Fail fast is about quickly detecting and responding to errors to prevent further issues.

• Fail safe often involves redundancy and error checking mechanisms to prevent catastrophic...read more
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