Unthinkable Solutions Software Developer Interview Questions, Process, and Tips

Round 1 -> 3 easy coding questions (I did all three)
round2 -> 2 coding questions (1 was leetcode's trapping rainwater problem) (Did 1.5)

Q1. SQL query was asked on joins etc
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Q2. What are Microservcies, solid principles, a pattern printing question, oops concepts
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Q1. Designing dbms for a college website
Ans. 
Designing a DBMS for a college website involves creating tables for students, courses, faculty, and more.
• Create tables for students, courses, faculty, departments, etc.

• Establish relationships between tables using foreign keys.

• Include attributes like student ID, course ID, faculty ID, etc.

• Implement normalization to reduce redundancy and improve data integrity.

• Consider implementing views for complex queries or reports.
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Q2. Implement debouncing, create a nodejs server with a get / post api, a puzzle, javascript questions like clousers, let / var / const, event loop, output based questions etc.
Ans. 
Implement debouncing, create a nodejs server with get/post api, and answer JavaScript questions.
• Implement debouncing by using setTimeout and clearTimeout to limit the number of times a function is called.

• Create a nodejs server with Express framework to handle get and post requests.

• Answer JavaScript questions on closures, let/var/const, event loop, and output based questions.

• Provide examples for each concept to demonstr
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Pattern, string, array

Q1. Merge intervals - lc
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Q2. Trapping rain water
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Q1. Behavioral questions
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Q2. Why do you want to join
Ans. 
I am passionate about creating innovative software solutions and believe your company aligns with my values and goals.
• Passionate about software development

• Believe company aligns with values and goals
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Subarray sum equals to zero

Q1. Basic technical questions related to your project
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Q1. Tell me about yourself
Ans. 
I am a passionate software developer with experience in Java, Python, and web development.
• Experienced in Java, Python, and web development technologies

• Strong problem-solving skills

• Team player with excellent communication skills
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It consisted of 30 mcq questoions

The second round was lasted for 20 mins with a hard leetcode questionj.

Coding test based on average DSA on hackerearch.

1 to 1 coding with interviewer

Some puzzles were asked more like quizez

Q1. Salary discussion and asked if know anything about company
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Q2. What do you know about our company
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Round duration - 90 minutes
Round difficulty - Easy

The 1st round was online coding + MCQ round. It had 3 sections in total to be solved in 95 mins.
Next comes the technical interview. 
The technical interview lasted for about 45 minutes. It started with a basic introduction. Then, she framed some questions from my resume and projects which I have mentioned. Questions were mainly from Data structure, OS, DBMS, SQL. She told me to rate my data structure skill on a scale of 1 to 5.

Q1. KthLargestNumber
You will be given a stream of numbers, and you need to find the kth largest number in the stream at any given time.
As the stream of numbers can not be given during compile time, so you ...read more
Ans. Brute Force
• The brute force approach for this problem is very trivial.
• We can always maintain an array that will hold the integers, sort the array in non-increasing order and return the element present at the kth index(1-based indexing).
• The array should be such that it can add elements efficiently, for example, vectors in C++, lists in python, etc. Whenever we receive a query of type 1, we add the element in the array an...read more
Answered by CodingNinjas
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Round duration - 30 minutes
Round difficulty - Easy

The technical interview lasted for about 45 minutes. It started with a basic introduction. Then, she framed some questions from my resume and projects which I have mentioned. Questions were mainly from Data structure, OS, DBMS, SQL. She told me to rate my data structure skill on a scale of 1 to 5.

Q1. Technical Questions
What is a semaphore?
What is race condition?
Describe all the joins in SQL with a Venn diagram.
 
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Q2. Search In BST
There is a Binary Search Tree (BST) consisting of ‘N’ nodes. Each node of this BST has some integer data.
You are given a pointer to the root node of this BST, and an integer ‘X’. Print &q...read more
Ans. Recursive Approach
Approach: If the root node has data smaller than ‘X’. then by properties of BST, ‘X’ cannot be in its left subtree, so we recursively check for the right subtree. 
If the root node has data larger than ‘X’. then by properties of BST, ‘X’ cannot be in its right subtree, so we recursively check for the left subtree.
If the root node has data equal to ‘X’, then we return “True”. 
 
The steps a...read more
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Q3. Remove Duplicates
Ninja is playing with numbers but hates when he gets duplicate numbers. Ninja is provided an array, and he wants to remove all duplicate elements and return the array, but he has to maint...read more
Ans. Brute Force
We will traverse the whole array and check if that element previously occurred or not.
 
The steps are as follows:
• We initialize a vector ‘ans’ to store the final non-duplicate elements.
• We will iterate over all the elements of the array, i.e., i = 0 to i = N - 1:
  • We will iterate over all the elements of the array excluding present element, i.e., j = 0 to j = N - 1:
    • If we get such positions such that arr[i] e...read more
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