National Payments Corporation of India Interview Questions, Process, and Tips

There were six questions to answer within 60 minutes: - A coding question involving rotating a matrix by 90, 180, and 270 degrees. - A simple binary search tree question such as finding an element. - Spring Boot questions, which included annotating the existing code with annotations like @Autowired, @Controller, @Service, etc. - A very simple REST API endpoint question that required sending the proper error as a response. - SQL questions that involved joining tables and using sum and aggregate functions, which were of medium difficulty. - The last question was easier than the first one.

Q1. HashMap based simple question like.. can we form this word from given string.. we just make sure the string has also char used in word
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Q2. Concurrent hashmap vs synchronised and how synchronised the collection...
Ans. 
ConcurrentHashMap allows multiple threads to access and modify it concurrently, while synchronized collections ensure thread safety by allowing only one thread to access at a time.
• ConcurrentHashMap is more efficient for concurrent access compared to synchronized collections.

• ConcurrentHashMap uses fine-grained locking to allow multiple threads to read and write concurrently.

• Synchronized collections use a single lock to ...read more
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Q1. What are the OWASP Top 10 Vulnerabilities?
Ans. 
OWASP Top 10 Vulnerabilities are common security risks in web applications.
• Injection

• Broken Authentication

• Sensitive Data Exposure

• XML External Entities (XXE)

• Broken Access Control

• Security Misconfiguration

• Cross-Site Scripting (XSS)

• Insecure Deserialization

• Using Components with Known Vulnerabilities

• Insufficient Logging and Monitoring
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Q2. What is Broken Object Level Authorization and how does it impact application security?
Ans. 
Broken Object Level Authorization is a vulnerability where an application fails to properly enforce access controls on objects.
• Occurs when an application allows users to access or manipulate objects they should not have access to

• Can lead to unauthorized data access, modification, or deletion

• Can be exploited by attackers to gain sensitive information or perform malicious actions

• Example: A user with regular privileges be
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The coding round consists of 3 to 5 coding questions accompanied by 10 multiple-choice questions.

Q1. Most of the questions focused on the current project
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Quantitative aptitude 60min

Easy to medium questions on arrays and strings

Q1. Sorting Techniques
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Q2. Searching Techniques
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Q3. Resume based questions ,projects
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