Wissen Technology Senior Software Engineer Interview Questions and Answers

Candle problem
Multiple choice questions
Non Repeating characters

Q1. Regarding SOLID principles and fibonacci series code
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Two simple coding questions were asked.

One multithreading questions was asked and few theoretical questions.

Q1. Few code snippets were provided on OOPs and result was asked.
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Q2. Sql query was asked.
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Q3. Two more rounds are still left
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Angular assignment
1. Using angular framework implement Login functionality

Q1. Closures, hoisting, arrow function, code output, write small programs java script, 3 coding questions
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Q1. Angular concept routing, template , services, interceptor, jit, etc
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Q1. Scenario based angular questions
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Q1. Culture fit, salary discussion
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6 Objective Questions, 2 Java Coding Question, One Sql query Question 1. Coding: Problem on Josephus Range Game, 2. Coding: Unequal Equal segments.

Q1. 1. Write a program to split array on given split size.
Ans. 
A program to split an array of strings into smaller arrays based on a given split size.
• Iterate through the array and create a new subarray every split size elements

• Use array slicing or a loop to extract the subarrays

• Handle cases where the split size is larger than the array length
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Q2. 2. Write a program to flatten multi dimension Object[] array to Integer[]
Ans. 
Program to flatten multi dimension Object[] array to Integer[]
• Use recursion to iterate through the array and flatten each element

• Check if each element is an array or an integer

• If it's an array, recursively flatten it

• If it's an integer, add it to the result array
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First round was a coding test on hackerearth. 5 objective, 2 coding and 1 sql question was there. Questions were easy.

Q1. Given an array of length n and a value k. Return a list of array which contains not more that k elements in each row of the list. Note: Check for the edge cases.
Ans. 
Split an array into subarrays with a maximum of k elements each.
• Iterate through the array and create subarrays of size k.

• Use a loop to slice the array into chunks of size k.

• Example: For array [1, 2, 3, 4, 5] and k=2, output is [[1, 2], [3, 4], [5]].

• Edge cases: If k is 0, return an empty list. If array is empty, return an empty list.
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Q2. Give a list of cards, sort on the basis of their rank and suit.
Ans. 
Sort a list of cards based on their rank and suit.
• Create a custom sorting function that first sorts by rank and then by suit

• Use a comparison function to compare ranks and suits of each card

• Example: ['2H', '3D', '10S', 'AH', '4C'] should be sorted as ['2H', '3D', '4C', '10S', 'AH']
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Q3. Can we use a user defined class as a key in hashmap? If yes explain how?
Ans. 
Yes, user-defined classes can be used as keys in a hashmap by overriding equals() and hashCode() methods.
• Override equals() method to define equality based on class attributes.

• Override hashCode() method to return a consistent hash code for the object.

• Example: For a class 'Person', use 'name' and 'id' for equality and hash code.

• Ensure that if two objects are equal, they must have the same hash code.
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Q1. Introduce yourself
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Q2. Technical questions related to java and dsa
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Q1. Javascript basics related to closure, hoisting, event loop
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