Prime Focus Technologies Software Developer Interview Questions and Answers

Coding test was medium to hard leetcode problems.

Interview for backend developer with experience in django

Q1. Writing ORM queries in django
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Q2. Database design with foregin and many to many fields
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Q3. Explain django's request response flow
Ans. 
Django's request response flow involves the request being handled by URL dispatcher, views, middleware, and templates before generating a response.
• Request is received by URL dispatcher which maps the URL to a view function

• View function processes the request, interacts with models if needed, and returns a response

• Middleware can intercept the request and response for additional processing

• Templates are used to generate HT
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Python interview question and coding

Q1. Python related question
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Q1. Oops? .net core features
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Q1. Linked list (detect loop, reverse, delte a node) tree (height, DFS) graph theory concept C++ basic questions
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Q1. Total 3 round of Technical interviews.
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Round duration - 60 minutes
Round difficulty - Easy

The second round is also written but you need to write programming based on their concept.

Q1. Find prime numbers
You are given a positive integer ‘N’. Your task is to print all prime numbers less than or equal to N.
Note: A prime number is a natural number that is divisible only by 1 and itself. ...read more
Ans. 
The naïve approach for this question is to run a loop from the start to the end number. And for each number, check if it is prime or not. If the number is prime, we print it otherwise skip it.

One optimization to this approach would be to skip all even numbers (except 2 if present in interval) since even numbers are not prime.
Function to check if a number is prime or not :
isPrime(n):
if (n <= 1) return false
for (i=2;
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Q2. Check If The String Is A Palindrome
You are given a string 'S'. Your task is to check whether the string is palindrome or not. For checking palindrome, consider alphabets and numbers only and ignor...read more
Ans. 
The idea is to create a copy of num and recursively pass the copy by reference, and pass num by value. In the recursive calls, divide num by 10 while moving down the recursion tree. While moving up the recursion tree, divide the copy by 10. When they meet in a function for which all child calls are over, the last digit of num will be ith digit from the beginning and the last digit of copy will be ith digit from the end
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Round duration - 60 minutes
Round difficulty - Easy

Technical round with questions mainly on Java and OOPS concepts.

Q1. Java Question
Difference between Static methods and Instance methods
Ans. 
Instance method can access the instance methods and instance variables directly.
Instance method can access static variables and static methods directly.
Static methods can access the static variables and static methods directly.
Static methods can’t access instance methods and instance variables directly. They must use reference to object. And static method can’t use this keyword as there is no instance for ‘this’ to ref
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Q2. Java Question
Difference between Abstract Class and Interface
Ans. 
1) Abstract class can have abstract and non-abstract methods. Interface can have only abstract methods. Since Java 8, it can have default and static methods also.
2) Abstract class doesn't support multiple inheritance. Interface supports multiple inheritance.
3) Abstract class can have final, non-final, static and non-static variables. Interface has only static and final variables.
4) Abstract class can provide the implem...read more
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Q3. Java Question
ClassNotFoundException Vs NoClassDefFoundError in Java
Ans. 
1. As the name suggests, ClassNotFoundException is an exception while NoClassDefFoundError is an error.
2. ClassNotFoundException occurs when classpath does not get updated with required JAR files while error occurs when the required class definition is not present at runtime.
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Q4. Java Question
Difference between Error and Exception
Ans. 
1 Type : 
Error : Classified as an unchecked type 
Exception : Classified as checked and unchecked 
2 Package :
Error : It belongs to java.lang.error 
Exception : It belongs to java.lang.Exception 
3 Recoverable/ Irrecoverable : 
Error : It is irrecoverable
Exception : It is recoverable
4 Error : It can't be occur at compile time 
Exception : It can occur at run time compile time both 
5 Ex...read more
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Q5. Java Question
What is SerialVersionUID?
Ans. 
The serialization at runtime associates with each serializable class a version number called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization.
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Q6. Java Question
What are the requirement for creating a Immutable Class in Java?
Ans. 
Following are the requirements: 

The class must be declared as final so that child classes can’t be created.
Data members in the class must be declared private so that direct access is not allowed.
Data members in the class must be declared as final so that we can’t change the value of it after object creation.
A parameterized constructor should initialize all the fields performing a deep copy so that data members can...read more
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Round duration - 120 Minutes
Round difficulty - Medium

I was MCQ + Coding round, Their were MCQ Based on DSA, Aptitude and 2 easy coding questions.

Q1. Ninja Competition
Our hero Ninja is organizing a coding competition where only two teams can participate simultaneously. To make the competition interesting and fair, both the teams should have an equal nu...read more
Ans. Brute Force
We will iterate from 1 to ‘N’ and count the number of even divisors and odd divisors. If they are equal, we will return true, else false.
 
Algorithm:
 
1. Declare two variables, ‘Odd_Count’ and ‘Even_Count’, and initialize them with zero.
2. Start iterating from 1 to ‘N’.
3. If the current iterator ( say i ) is a divisor of ‘N’ ( N % i == 0 ):
   1. If ‘i’ is odd, increase the ‘Odd_Count’ by 1.
   2. If ‘i’ is even, increase ...read more
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Q2. Help Bob Out!
Bob has just turned 18 years old and has opened a Bank account. However, since he has just opened his bank account he is not very experienced about the working of banks, therefore he asks for...read more
Ans. Brute Force
To check whether the string is a valid IFSC Code or not we can check every character of the string explicitly and check whether the string is in the correct format or not.
 
Algorithm:-
1. If the length of the string is not equal to 11, return False.
2. Else, iterate from the first index to the fourth index.
   1. Check whether the ASCII values of the characters lie between 65 - 90. If not, return False.
3. If yes, check wh...read more
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Round duration - 50 Minutes
Round difficulty - Easy

The nature of the interviewer was very kind. The test was proctored, our webcam and mic were on, and shared my screen.

Q1. OOPS Questions
Tell me somethings about OOPs.
Functional v/s OOPS programming language
Polymorphism
Static and Final Keyword in JAVA
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Q2. Technical Questions
Explain your project.
Show working of your project.
Tech stack used.
Rest API
There are 3 boxes of green, orange and green+orange. how will you know the all boxes after picking from one box ...read more
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Round duration - 50 minutes
Round difficulty - Easy

The nature of the interviewer was very kind. The test was proctored, our webcam and mic were on, and shared my screen.

Q1. Technical Questions
Tree traversal(Pre-order, Post-order, In-order, Level-order) and code of all orders.
All type Sorting Algorithms and their use cases
How will you make 102-102=1
make 30 using 5 2's
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