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Senior Technical Team Member Interview Questions and Answers

Updated 3 Mar 2025

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Q1. Given an array, how can you rotate it by n positions?

Ans.

Rotate an array of strings by n positions

  • Create a new array and copy elements from original array starting from index n to the end, then copy elements from index 0 to n-1

  • Alternatively, you can use array slicing to achieve the rotation

  • Example: Original array ['a', 'b', 'c', 'd', 'e'], rotate by 2 positions would result in ['c', 'd', 'e', 'a', 'b']

Q2. What is the implementation of a palindrome check in Java without using the reverse() function?

Ans.

Implementing a palindrome check in Java without using the reverse() function.

  • Create a function that takes a string as input.

  • Use two pointers, one starting from the beginning of the string and the other from the end.

  • Compare characters at the two pointers and move them towards each other until they meet or cross.

  • If all characters match, the string is a palindrome.

  • Example: 'racecar' is a palindrome.

  • Example: 'hello' is not a palindrome.

Q3. What is the algorithm to reverse a singly linked list?

Ans.

The algorithm to reverse a singly linked list involves iterating through the list and changing the pointers to reverse the direction of the links.

  • Start with three pointers: current, previous, and next.

  • Iterate through the list, updating the next pointer to point to the previous node.

  • Move the previous pointer to the current node and the current pointer to the next node.

  • Continue until the end of the list is reached, then update the head of the list to the last node visited.

Q4. Sorting arrays from 0's,1 in java , No sorting algorithm to be used Difficulty: Easy

Ans.

Use counting method to sort array of strings with 0's and 1's.

  • Create a count array to store the frequency of 0's and 1's.

  • Update the original array based on the count array.

  • Example: Input array - ['0', '1', '0', '1', '1'], Output array - ['0', '0', '1', '1', '1']

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Q5. Difference between HTTP vs HTTPS indication

Ans.

HTTPS provides secure communication over the internet using encryption, while HTTP does not.

  • HTTPS uses SSL/TLS encryption to secure data transmission, while HTTP does not.

  • HTTPS URLs begin with 'https://' and use port 443, while HTTP URLs begin with 'http://' and use port 80.

  • HTTPS ensures data integrity and authentication, while HTTP does not provide these security measures.

Q6. Write a SQL query for employee table having

Ans.

SQL query to retrieve data from employee table

  • Use SELECT statement to retrieve data

  • Specify the columns you want to retrieve

  • Use FROM clause to specify the table name

  • Add any conditions using WHERE clause if needed

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Q7. Last entry of a table in sql query

Ans.

Use ORDER BY and LIMIT to get last entry in SQL query

  • Use ORDER BY column_name DESC to sort in descending order

  • Use LIMIT 1 to get only the last entry

Q8. Internal functioning of hash map

Ans.

Hash map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.

  • Hash map uses a hash function to determine the index of the key-value pair in the underlying array.

  • Collisions can occur when two keys hash to the same index, which can be resolved using techniques like chaining or open addressing.

  • Hash maps offer constant time complexity O(1) for insertion, deletion, and lookup operations on average.

  • Example: HashMap<Strin...read more

Q9. SCCP layer explanation

Ans.

SCCP layer is a signaling protocol used in telecommunication networks for call setup and management.

  • SCCP stands for Signaling Connection Control Part

  • It is used in SS7 (Signaling System 7) networks

  • SCCP provides additional functionality compared to MTP (Message Transfer Part)

  • It handles addressing, routing, and error detection in the network

  • Examples of SCCP messages include connection request, connection confirm, and connection release

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