Cornerstone OnDemand Principal Software Engineer Interview Questions and Answers for Experienced

Q1. Two sum of an array
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. Stack balance parenthesis
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Q1. Is circular loop is there in a linkedList
Ans. 
No, a circular loop is not present in a linked list.
• A linked list does not have a circular loop by default.

• If a linked list has a circular loop, it is considered a circular linked list.

• Circular linked lists can be detected using Floyd's Cycle Detection Algorithm.
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Q2. How to identify the duplicates in circular linkedList
Ans. 
To identify duplicates in a circular linked list, use a hash set to keep track of visited nodes.
• Traverse the circular linked list while adding each node to a hash set.

• If a node is already in the hash set, it is a duplicate.

• Consider edge cases such as an empty list or a list with only one node.
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Time and Speed, Percentages, Averages, Ratio and Proportion, Time and Work etc.

Platform was Mettle Assessment, Topics were Tree and Binary Search

Work from office vs Work from Home

Q1. Multi-threading, Communication between thread, dynamic programming, trees, sorting techniques.
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Q2. What is TCP, UDP, Difference between TCP and UDP, Three way handshaking problem, socket programming, HTTP Protocol.
Ans. 
TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are protocols used for data transmission over networks.
• TCP is a connection-oriented protocol that guarantees reliable delivery of data.

• UDP is a connectionless protocol that does not guarantee reliable delivery of data.

• The main difference between TCP and UDP is that TCP provides reliable, ordered, and error-checked delivery of data, while UDP does not.

• ...read more
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Q3. Write code to print bottom view of Binary Search Tree
Ans. 
Print the bottom view of a Binary Search Tree.
• Use a map to store the horizontal distance and the bottom-most node at that distance.

• Traverse the tree in level order and update the map with each node's horizontal distance and level.

• Print the nodes in the map in ascending order of their horizontal distance.
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Q1. Why you want to work from office
Ans. 
I believe working from the office allows for better collaboration and communication with colleagues.
• Better collaboration and communication with colleagues

• Opportunity for face-to-face interactions

• Easier access to resources and equipment

• Faster problem-solving through immediate discussions

• Building stronger relationships with team members
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Q2. Why should we hire you
Ans. 
I have the technical skills, experience, and passion for software engineering that make me a valuable asset to your team.
• I have a strong background in computer science and software development

• I have experience working on various software projects and have a proven track record of delivering high-quality code

• I am a quick learner and can adapt to new technologies and programming languages

• I am a team player and can effect...read more
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Q3. Tell any moment when you felt motivated and depressed at same time. etc
Ans. 
Yes
• When I received a promotion at work but also had to deal with the loss of a loved one

• When I achieved a personal goal but also faced criticism from others

• When I received positive feedback on a project but also experienced imposter syndrome
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Q1. Understanding of the project structure.
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Q1. Framework related questions
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Q1. Culture fitment queries.
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Q1. EXPLAIN current project application architecture.
Ans. 
Current project application architecture is microservices-based with containerization using Docker and orchestration with Kubernetes.
• Microservices architecture for scalability and flexibility

• Containerization with Docker for easy deployment and management

• Orchestration with Kubernetes for automated scaling and load balancing
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Q2. Explain Oauth and Jwt implementation
Ans. 
OAuth is an authorization framework that allows third-party applications to obtain limited access to a user's data without exposing their credentials. JWT is a compact, self-contained way for securely transmitting information between parties as a JSON object.
• OAuth allows users to grant access to their resources without sharing their credentials directly.

• JWT is a token format that can be used for securely transmitting i...read more
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Q3. Web Api implementation and pattern used
Ans. 
Web API implementation using RESTful architecture with MVC pattern.
• Use RESTful principles for designing API endpoints

• Implement controllers to handle incoming requests and return responses

• Leverage MVC pattern for separating concerns and improving maintainability

• Utilize DTOs (Data Transfer Objects) for transferring data between layers

• Implement authentication and authorization mechanisms for secure access
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Q1. Write program without using for loop and print 1 to 100
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Q2. Explain sql joins
Ans. 
SQL joins combine rows from two or more tables based on related columns.
• INNER JOIN: Returns records with matching values in both tables. Example: SELECT * FROM A INNER JOIN B ON A.id = B.id;

• LEFT JOIN: Returns all records from the left table and matched records from the right table. Example: SELECT * FROM A LEFT JOIN B ON A.id = B.id;

• RIGHT JOIN: Returns all records from the right table and matched records from the left ...read more
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Q1. Previous salary
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Q2. Ready to work immediate
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1 hr test, simple aptitude questions

Simple coding questions

Q1. Reverse the string
Ans. 
Reverse a given string
• Iterate through the string from end to start and append each character to a new string

• Use built-in functions like reverse() in Python or StringBuilder.reverse() in Java

• Convert the string to an array, reverse the array, and convert it back to a string
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Q2. Basic Networking questions
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Q3. Questions on working of jvm
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Q1. Be prepared with your strength and weakness and just be yourself.
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