BUSINESSNEXT Software Engineer Interview Questions and Answers

Q1. They asked first question related to Spring security .
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Q2. Questions related to rest API Given scenario and asked approach
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Q3. Database related like procedures call in db and also in springboot
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Q4. Core java related to collections
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Q1. In second round , interviewer asked me to write logic for Array sort
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Q2. Singleton class
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Q3. Design pattern like singleton and factory , dao
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Q4. Spring data JPA , jdbc connection
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Q5. Hibernate annotation
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Q1. Related to projects what we had done
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Q2. Difficult situations what u face
Ans. 
Handling difficult situations by staying calm, analyzing the problem, and finding a solution.
• Remaining calm under pressure

• Identifying the root cause of the problem

• Collaborating with team members to brainstorm solutions

• Prioritizing tasks to address the issue efficiently
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Q3. Code standardization
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2 coding question for 60 mins. One array based question and one string based question.

Q1. Oops 2 pillars with examples ?
Ans. 
Oops 2 pillars are Abstraction and Encapsulation.
• Abstraction: Hiding unnecessary details and showing only relevant information. Example: Car dashboard displaying speed without showing internal engine details.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: Class in object-oriented programming encapsulates data and methods.
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Q2. Inheritance and it's types with examples ?
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Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.
• Types of inheritance: single inheritance, multiple inheritance, multilevel inheritance, hierarchical inheritance

• Single inheritance: a class inherits from only one parent class. Example: class Dog inherits from class Animal

• Multiple inheritance: a class inherits from multiple parent classes. Example:...read more
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Q1. What is the inheritance?
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Inheritance is a mechanism in object-oriented programming where a class inherits properties and behaviors from another class.
• Allows a class to inherit attributes and methods from another class

• Promotes code reusability and reduces redundancy

• Creates a parent-child relationship between classes

• Derived class can override or extend the functionality of the base class
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Q2. What are the types of joins in mysql
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Types of joins in MySQL include inner join, left join, right join, and full join.
• Inner join: Returns rows when there is a match in both tables.

• Left join: Returns all rows from the left table and the matched rows from the right table.

• Right join: Returns all rows from the right table and the matched rows from the left table.

• Full join: Returns rows when there is a match in one of the tables.
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Q1. How to handle multiple api's
Ans. 
Use a centralized API gateway to manage and route requests to multiple APIs efficiently.
• Implement a centralized API gateway to handle incoming requests and route them to the appropriate API based on the endpoint.

• Utilize API management tools like Apigee, Kong, or AWS API Gateway to manage and monitor multiple APIs.

• Consider implementing a caching layer to improve performance and reduce the number of requests to external
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Q2. What does strstr function do?
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strstr function searches for a substring within a string and returns a pointer to the first occurrence of the substring.
• Used in C programming language

• Syntax: char *strstr(const char *haystack, const char *needle)

• Example: char *str = strstr("hello world", "world")
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Q1. My expertise are in golang. And all the questions were straight forward around golang.
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Q2. What is concurrency. How to check performance of applications. How to handle concurrency. How many no of goroutines can be created and so on.
Ans. 
Concurrency is the ability of a system to run multiple tasks simultaneously. Performance of applications can be checked using profiling tools. Concurrency can be handled using synchronization techniques like mutexes and channels.
• Concurrency allows multiple tasks to run concurrently, improving performance and responsiveness.

• Performance of applications can be checked using profiling tools like Go's built-in 'pprof' packa...read more
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Q1. How to make sure there are no vulnerabilities. What engineering principles you follow.
Ans. 
To ensure no vulnerabilities, follow secure coding practices, conduct regular security audits, use encryption, and stay updated on security threats.
• Follow secure coding practices such as input validation, output encoding, and parameterized queries.

• Conduct regular security audits to identify and address vulnerabilities in the code.

• Use encryption to protect sensitive data in transit and at rest.

• Stay updated on security t...read more
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Maths ,english ,reasoning, puzzles

Jackeron was the platform