Paytm Payments Bank Technical Lead Interview Questions and Answers for Experienced

Haker rank,..........,...........

Q1. Ds alogortithns,........
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Q1. Full resume screening
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Q1. Question on questions
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Q1. Assurance of joining
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Q1. Re-Assuarance of results
Ans. 
Reassuring the interviewer about the reliability of the results
• Highlight the thoroughness of the process followed to obtain the results

• Mention any quality control measures implemented to ensure accuracy

• Provide examples of successful outcomes or positive feedback received

• Discuss any certifications or accreditations that validate the results
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Q1. Final assurance of achieving of Target
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Final assurance of achieving target is through continuous monitoring, adjusting strategies, and team collaboration.
• Regularly track progress towards the target

• Analyze data to identify areas of improvement

• Adjust strategies based on feedback and results

• Collaborate with team members to ensure everyone is aligned and working towards the same goal
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Q1. Salary negotiation
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Q1. Personal Details
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Q2. Work Experience
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Q1. Complete Unix sql Java
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Q2. Sql basics and Unix
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Q3. Unix basics and commands
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They will share one link .. in that we have few multiple choise questions and 3 coding problems. one java, one HTML and one SQL

Q1. Hibernate type of caches ?
Ans. 
Hibernate supports two types of caches: Level 1 (session) cache and Level 2 (SessionFactory) cache.
• Level 1 cache is associated with the session object and is enabled by default.

• Level 2 cache is shared across sessions and requires configuration.

• Level 2 cache can be implemented using various providers like Ehcache, Infinispan, Hazelcast, etc.
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Q2. How to implement REST API (steps)?
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To implement REST API, follow these steps:
• Define the resources and their URIs

• Define the HTTP methods (GET, POST, PUT, DELETE)

• Implement the methods using a programming language

• Test the API using tools like Postman

• Document the API using tools like Swagger
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Q3. Transaction Management in springboot?
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Spring Boot provides transaction management support through the use of @Transactional annotation.
• Spring Boot uses the @Transactional annotation to manage transactions.

• The @Transactional annotation can be applied to methods or classes.

• Spring Boot supports both programmatic and declarative transaction management.

• Programmatic transaction management involves using the TransactionTemplate class.

• Declarative transaction manag...read more
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Q4. CrudRepository v/s JpaRepository ?
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Q5. What is n+1 issue in hybernate ?
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n+1 issue in Hibernate refers to the problem of excessive database queries being executed due to lazy loading.
• Occurs when a query fetches an entity and its associated entities one at a time instead of all at once

• Can be solved by using eager loading or batch fetching

• Can also be solved by using a join fetch query

• Can lead to performance issues and slow down the application
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Q6. Write small code using @OneToMany and @ManyToOne ?
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Example code using @OneToMany and @ManyToOne annotations
• Create two entities, one with @OneToMany and the other with @ManyToOne annotation

• Use mappedBy attribute in @OneToMany to specify the relationship

• Use joinColumn attribute in @ManyToOne to specify the foreign key column

• Example: User has many Posts, Post belongs to one User
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Q1. HR will discuss about your Salary and other things ?
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