PayU Payments Interview Questions, Process, and Tips

Q1. What are bagging and boosting techniques in machine learning?
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Q1. Just to know more about why i want the role
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Testing an payment flow on the application

Q1. A tough sql question
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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
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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
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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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DSA Questions and resume

Q1. Asked to code regression taking any example
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Q2. About my past internship
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A case study was given which was very confusing, i came up with the solution but seemed that I misinterpreted the scenario.

Q1. What does project manager do
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Q2. Tell us some risks identified
Ans. 
Some risks identified include budget overruns, scope creep, resource constraints, and stakeholder conflicts.
• Budget overruns: Potential for unexpected expenses exceeding the allocated budget.

• Scope creep: Risk of project scope expanding beyond initial requirements.

• Resource constraints: Possibility of not having enough resources (time, money, personnel) to complete the project.

• Stakeholder conflicts: Risks associated with ...read more
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