Fullstack Developer

You have been given a sorted array/list 'arr' consisting of ‘n’ elements. You are also given an integer ‘k’.

Now the array is rotated at some pivot point unknown to you.

For example, if 'arr' = [ 1, 3, 5, 7, 8], then after rotating 'arr' at index 3, the array will be 'arr' = [7, 8, 1, 3, 5].

Now, your task is to find the index at which ‘k’ is present in 'arr'.

Note :

1. If ‘k’ is not present in 'arr', then print -1.
2. There are no duplicate elements present in 'arr'. 
3. 'arr' can be rotated only in the right direction.

Example:

Input: 'arr' = [12, 15, 18, 2, 4] , 'k' = 2

Output: 3

Explanation:
If 'arr' = [12, 15, 18, 2, 4] and 'k' = 2, then the position at which 'k' is present in the array is 3 (0-indexed).

Given a sequence of ‘N’ space-separated non-negative integers A[1],A[2],A[3],......A[i]…...A[n]. Where each number of the sequence represents the height of the line drawn at point 'i'. Hence on the cartesian plane, each line is drawn from coordinate ('i',0) to coordinate ('i', 'A[i]'), here ‘i’ ranges from 1 to ‘N’. Find two lines, which, together with the x-axis forms a container, such that the container contains the most area of water.

Note :

1. You can not slant the container i.e. the height of the water is equal to the minimum height of the two lines which define the container.

2. Do not print anything, you just need to return the area of the container with maximum water.

Example

For the above Diagram, the first red marked line is formed between coordinates (2,0) and (2,10), and the second red-marked line is formed between coordinates (5,0) and (5,9). The area of water contained between these two lines is (height* width) = (5-2)* 9 = 27, which is the maximum area contained between any two lines present on the plane. So in this case, we will return 3* 9=27.

Explain how Django ORM works and write a query for fetching data using filters and annotations. (Learn)

The interviewer also asked about the difference between select_related and prefetch_related.

Explain how do you create REST APIs using Django REST Framework — including serializers, viewsets, and how to handle authentication. I also had to describe how I handle validation and error responses.

I was given a small scenario to design a database schema for a hotel booking system. The interviewer wanted to check my understanding of relationships like one-to-many and many-to-many (Learn), along with how to optimize queries.

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• Generators (Learn)
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You are having a string ‘S’ containing ASCII characters.

You are required to reverse the input string.

Output the reverse of the string ‘S’.

Example :

S = “hello”

Explanation : 

The reverse of the string ‘S’ is “olleh”.

Since the project involved FastAPI, I was asked how FastAPI differs from Django, how routing and dependency injection work, and how I would handle async requests.

They asked me to explain one of my past projects in detail — including its architecture, what challenges I faced, how I implemented APIs, and how I optimized performance in the backend.