HackerRank Senior Software Developer Interview Questions and Answers

Q1. Action Filters In MVC
Ans. 
Action filters are used in ASP.NET MVC to execute code before or after an action method is called.
• Action filters can be used to perform authentication and authorization checks.

• They can also be used to modify the result of an action method.

• Examples of action filters include Authorize, OutputCache, and HandleError.

• Action filters can be applied globally, to a controller, or to an individual action method.
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Q2. What is the difference between controller and API controller
Ans. 
A controller is used for handling user requests while an API controller is used for handling API requests.
• A controller is used for rendering views while an API controller is used for returning data in JSON format.

• API controllers are usually lighter and faster than regular controllers.

• API controllers are often used for building RESTful APIs.

• Examples of API frameworks that use API controllers include Laravel and ASP.NET
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Q1. Difference between IEnumerable and IQuriable
Ans. 
IEnumerable is read-only and forward-only while IQueryable is queryable and can be used with LINQ to SQL.
• IEnumerable is used for in-memory collections while IQueryable is used for querying external data sources.

• IQueryable allows for deferred execution while IEnumerable does not.

• IQueryable can be used with LINQ to SQL to translate queries into SQL statements.

• IEnumerable is simpler and more lightweight than IQueryable.

• IE...read more
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Q2. What is the use of Yield Key word
Ans. 
Yield keyword is used in Python to create generators that can be used to iterate over large datasets without loading them into memory.
• Yield is used to pause and resume a function's execution.

• Generators created using yield are memory efficient as they only load data when needed.

• Yield can be used to implement lazy evaluation.

• Yield can be used to create infinite sequences.

• Example: def my_generator(): yield 1; yield 2; yie...read more
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Basic OOP questions for python programming language

Q1. What's abstraction
Ans. 
Abstraction is the concept of hiding complex implementation details and showing only the necessary information to the user.
• Abstraction allows users to focus on what an object does instead of how it does it

• It helps in reducing complexity and improving efficiency in software development

• Example: In object-oriented programming, abstract classes and interfaces are used to achieve abstraction
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Q2. What's the difference between SQL and NoSQL database
Ans. 
SQL databases are relational databases with structured data, while NoSQL databases are non-relational databases with flexible, unstructured data.
• SQL databases use structured query language for defining and manipulating data, while NoSQL databases use different query languages or APIs.

• SQL databases are table-based, with a predefined schema, while NoSQL databases are document, key-value, wide-column, or graph-based.

• SQL d...read more
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Q1. Reverse a linked list
Ans. 
Reverse a linked list by changing the direction of pointers
• Start with three pointers: current, prev, and next

• Iterate through the linked list, updating pointers to reverse the direction

• Update the head of the linked list to the last node after reversing
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Q2. Implement binary search algorithm
Ans. 
Binary search algorithm efficiently finds the target value in a sorted array.
• Start by defining the low and high indices of the array.

• Calculate the mid index and compare the target value with the value at mid.

• If target is less than mid value, update high to mid-1; if greater, update low to mid+1.

• Repeat until target is found or low is greater than high.
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Q1. Brief Introduction and basic questions
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Q2. Future plans and how am i going to achieve them
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Basic Logical programs

Q1. Explain laravel Structure
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Q2. Database migration
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Q3. What is indexing in database
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Q4. What is controller ,What is Route
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Q1. Why you leave your previous Company
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Q2. What is your role in previous company
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Java, spring,springboot

2 Query question and 3 coding questions

Q1. Basic oops , Java script and Networking questions.
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Q2. What is object orienteered programming.
Ans. 
Object oriented programming is a programming paradigm based on the concept of objects, which can contain data and code.
• Objects are instances of classes, which define the structure and behavior of the objects.

• Encapsulation, inheritance, and polymorphism are key principles of object oriented programming.

• Example: Java, C++, Python are popular languages that support object oriented programming.
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Q3. Different Events in java script
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Events in JavaScript are actions or occurrences that happen in the browser that the code can respond to.
• Events can be triggered by user actions (like clicking a button), browser actions (like page load), or system events (like a timer expiring)

• Event listeners are used to listen for and respond to events

• Common events include click, mouseover, keydown, submit, etc.
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Q4. Event listeners
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Project , coding question, DBMS

Q1. Basic personal details
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2 DSA questions Both are from DP

Q1. 2 Questions , 1 is DSA
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Q2. Second question is Puzzle
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A working software coding problem. Build client-server. Make sure your IDE is ready

Q1. Difference between async, concurrency and parallelism
Ans. 
Async is non-blocking, concurrency is managing multiple tasks at the same time, parallelism is executing multiple tasks simultaneously.
• Async allows non-blocking execution of code, enabling other tasks to run while waiting for I/O operations.

• Concurrency involves managing multiple tasks at the same time, but not necessarily simultaneously.

• Parallelism is executing multiple tasks simultaneously, utilizing multiple CPU core...read more
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Q2. Journey of request
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The journey of a request refers to the process of a request being made, processed, and fulfilled by a system.
• Request initiation by a user or system

• Routing of the request to the appropriate service or endpoint

• Processing of the request by the service

• Response generation and delivery back to the user
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Q1. What are your strengths
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Q2. What irritates you
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Q1. DS Algo type questions, string manipulation etc was asked and explored with more detailed questions
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Q1. In depth android, kotlin discussions and high level mapping questions
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Q1. General managerial questions and working agreements type discussion
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