Cumulus Systems Backend Developer Interview Questions and Answers

There were 3 coding questions to solve on paper and they will analyze and shortlist for the interview and discuss your answers.

Q1. Questions on core java like threads, synchronisation, static vs non static methods , singleton design pattern, copy constructor, reflection.
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Q2. 2 dsa problems 1. Reverse a singly linked list 2. Find pairs in an array which sums to given sum
Ans. 
Two common DSA problems - reversing a singly linked list and finding pairs in an array that sum to a given value.
• To reverse a singly linked list, iterate through the list and change the direction of the pointers.

• To find pairs in an array that sum to a given value, use a hash table to store the difference between the target sum and each element in the array, then check if any subsequent elements match the stored differe...read more
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Q1. 1. Implement queue using stack 2. Remove duplicates from a linked list
Ans. 
Implement queue using stack & remove duplicates from linked list
• To implement queue using stack, we need to maintain two stacks. One for enqueue operation and another for dequeue operation.

• To remove duplicates from a linked list, we can use a hash table to keep track of visited nodes and remove duplicates as we traverse the list.

• Alternatively, we can use two pointers to compare each node with all subsequent nodes and re...read more
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Q2. What kind of security have you used in your project. Explain from signup to signin.
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Q1. How will you solve any technical difficulties that you were not aware of.
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Q2. Will you be able to handle the responsibility, and work on weekends to meet the deadline.
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