CommerceIQ Software Development Engineer Interview Questions and Answers

Aptitude Had around 50 Questions which cover Logical,Quantitative, Code snippets

Q1. Two Sum in Coding
Ans. 
Find two numbers in an array that add up to a specific target value.
• Use a hashmap to store the difference between the target value and each element in the array.

• Iterate through the array and check if the current element's complement exists in the hashmap.

• Return the indices of the two numbers that add up to the target value.
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Q2. Differences in final,Finally,Finalize
Ans. 
final, finally, and finalize are related terms in programming but have different meanings and usage
• final is a keyword in Java used to restrict inheritance, method overriding, and variable reassignment

• finally is a block of code in exception handling that always executes, regardless of whether an exception is thrown

• finalize is a method in Java used for cleanup operations before an object is garbage collected
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Q3. Basic Sql operations
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Q1. Array List Implementation in Stack for Push and pop
Ans. 
Array List can be implemented in a stack by using an array and keeping track of the top element.
• Create an array to store the elements of the stack.

• Keep track of the top element using a variable.

• For push operation, add the element to the top of the stack and increment the top index.

• For pop operation, remove the top element and decrement the top index.
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Q2. Finding 3rd Largest Number in an Array without using Sort
Ans. 
Find 3rd largest number in array without sorting
• Iterate through array to find largest, 2nd largest, and 3rd largest numbers

• Keep track of these numbers as you iterate

• Return the 3rd largest number found
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Q3. Finding the min number of Swap in Sorting of Array
Ans. 
To find the minimum number of swaps needed to sort an array
• Use graph theory to find cycles in the array

• Count the number of swaps needed to fix each cycle

• Add up the swaps needed for all cycles to get the total minimum swaps
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Q1. Experience in past proyects
Ans. 
I have worked on various projects ranging from web development to mobile app development, gaining experience in different technologies and frameworks.
• Developed a web application using React.js and Node.js for a client in the e-commerce industry

• Created a mobile app using Flutter for a startup in the travel sector

• Collaborated with a team to implement a machine learning algorithm for data analysis in a research project
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Q2. Experience leading a group of develeopers
Ans. 
Led a team of developers on a project to develop a new software application.
• Managed a team of 5 developers to ensure project deadlines were met

• Assigned tasks to team members based on their strengths and expertise

• Held regular team meetings to discuss progress and address any issues

• Provided guidance and support to team members when needed

• Collaborated with other departments to gather requirements and feedback
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Q1. It was more like a talk about your experience
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Q2. Code test to create a small search enginee
Ans. 
Code test to create a small search engine
• Create a function that takes a search query and an array of strings as input

• Iterate through the array of strings to find matches with the search query

• Return an array of strings that contain the search query
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Machine coding round

Q1. TCP/IP related questions, what happens when you search a webpage?
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Q2. Past projects discussions
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Q1. Behavioural questions on how would you tackle a particular scenario
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Q1. Sql related questions were asked
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Q2. Manual testing questions were asked
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Q3. Joins questions
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Q4. Where clause questions
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Q5. Manual testing questions
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Q1. Sorting of an array
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Q2. Bubble sorting algorithm
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Q1. Java oops question
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Q1. API questions related to put and patch api
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Q1. Can you describe a situation in which you were unable to convince your senior?
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Q2. What is your approach to managing a subordinate who is not performing?
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Q1. How to identify if a queue is circular
Ans. 
A circular queue can be identified by checking if the rear pointer is one position behind the front pointer.
• Check if rear pointer is one position behind front pointer

• Check if front pointer is at index 0 and rear pointer is at index n-1 in an array of size n

• Check if front pointer is at index rear+1 modulo n in an array of size n
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Q1. Design notification system
Ans. 
Design a notification system for a software application.
• Identify the types of notifications needed (e.g. email, SMS, in-app)

• Consider the frequency and urgency of notifications

• Implement a notification queue to handle multiple notifications

• Include user preferences for notification settings

• Utilize push notifications for real-time updates
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Write multiple polyfills for array