Qualtech Consultants Senior Software Developer Interview Questions and Answers

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Q1. Programming related questions.
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Q1. DSA round (easy to medium)
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Q1. Technical+ hr round
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Q1. Technical questions.
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Q1. Given the react machine coding example
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Q1. Explain about your projects
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Q1. How make a queue using a stack
Ans. 
To implement a queue using a stack, use two stacks and simulate the queue operations.
• Use two stacks, one for enqueue operation and one for dequeue operation.

• For enqueue operation, simply push elements onto the stack used for enqueueing.

• For dequeue operation, if the dequeue stack is empty, pop all elements from enqueue stack and push onto dequeue stack.

• Then pop from the dequeue stack to simulate dequeue operation.
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Q2. Create a linked list
Ans. 
A linked list is a data structure consisting of nodes where each node points to the next node in the sequence.
• Create a Node class with data and next pointer

• Initialize a head pointer to null

• Add nodes by updating next pointers

• Traverse the list by following next pointers
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Coding Rount
DSA Round + Puzzle
SQL + Project Discussion
JS

Dsa problems dp and tress problem

Q1. Tell me about your self
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Q2. Projects and intership
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Q1. About the project. and asked what i did in project. how to create schema in pyspark. what is ADE. what are the difficulties i faced in project. what is spark submit command how we write sparksubmit command...read more
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Q2. No of occurrences of letter in a string.
Ans. 
Count occurrences of a letter in a string.
• Iterate through each character in the string and count occurrences of the specified letter.

• Use a hashmap to store the count of each letter.

• Handle both uppercase and lowercase letters to ensure accurate counting.
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Question based on array string linkedlist