M2P Fintech Software Development Engineer 1 Interview Questions and Answers

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 , 1 medium and 1 hard
FInd Kth smallest element
Find Peak element

Q1. Parking Lot System design
Ans. 
Design a parking lot system with features like parking, unparking, and checking availability.
• Design classes for ParkingLot, ParkingSpot, Vehicle, etc.

• Implement methods for parking a vehicle, unparking a vehicle, and checking spot availability.

• Consider using data structures like HashMap or ArrayList to manage parking spots.

• Include features like ticket generation, fee calculation, and spot reservation.
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Q1. Lazy loading and eager loading in Java in context of Singleton class
Ans. 
Lazy loading defers the initialization of an object until it is actually needed, while eager loading initializes the object immediately.
• Lazy loading is commonly used in Singleton pattern to delay the creation of the instance until it is requested.

• Eager loading initializes the Singleton instance at the time of class loading.

• Lazy loading can help improve performance by only creating the instance when needed, while eager ...read more
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Q2. Connect master and slave instances of a DB in spring boot project
Ans. 
Use Spring Boot configuration to connect master and slave instances of a DB
• Configure multiple data sources in application.properties or application.yml file

• Use @Primary annotation for the master data source and @Qualifier annotation for the slave data source

• Define separate DataSource, JdbcTemplate, and EntityManager beans for each data source

• Use @Transactional annotation with the appropriate data source to specify whic
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Q3. Global Exception handler in Spring boot
Ans. 
Global exception handler in Spring Boot handles all exceptions thrown by the application.
• Global exception handler can be implemented using @ControllerAdvice annotation in Spring Boot.

• It allows centralized exception handling for all controllers in the application.

• You can define methods annotated with @ExceptionHandler to handle specific exceptions.

• Global exception handler can return custom error responses or redirect to
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Q1. One leetcode easy-medium problem
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Q2. Java, springboot and oops question
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Q1. Project related questions
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Q2. System design questions
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Q1. Aks about the few questions of dsa
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Q2. Ask about the design system
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Q1. Ask about the design system
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Q1. Machine coding: Design in-memory document search
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Q1. HLD: Design a ad-click aggregation service
Ans. 
Design an ad-click aggregation service for tracking and analyzing ad clicks.
• Use a distributed system to handle high volume of ad click data

• Implement real-time processing for immediate insights on ad performance

• Utilize a database to store aggregated ad click data for reporting and analysis
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