Loop Health Software Engineer Interview Questions and Answers

Q1. Left view of BST
Ans. 
Left view of BST is the nodes visible when viewing the tree from the left side.
• The left view of a BST includes the leftmost node at each level.

• Use level order traversal to find the left view nodes.

• Example: For BST with nodes 1, 2, 3, 4, 5, the left view is 1, 2.
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Q1. Detect loop in a Linked List
Ans. 
Use Floyd's Tortoise and Hare algorithm to detect loop in a Linked List.
• Initialize two pointers, slow and fast, at the head of the Linked List.

• Move slow pointer by one step and fast pointer by two steps.

• If they meet at any point, there is a loop in the Linked List.
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Q2. Second largest salary from employee table
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60 Minutes coding test was there

Q1. Worst experience ever, never apply for company in this, highly unstable company
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Q2. Add two numbers in a linked list, don't apply
Ans. 
Traverse the linked list and add the values of each node without using additional data structures.
• Traverse the linked list while keeping track of the sum in a variable

• Update the sum by adding the value of each node as you traverse the list

• Handle carry over if the sum of two nodes is greater than 9
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Q3. Sort the array by using all sorting algorithms, don't join
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Q4. Subset problem find all the subsets
Ans. 
To find all subsets of a given set, use recursion to generate all possible combinations.
• Use recursion to generate all possible combinations of including or excluding each element in the set.

• Start with an empty subset and recursively add each element to create new subsets.

• Each subset can be represented as an array of strings.
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Q5. LRU Cache problem, explain it and implement it
Ans. 
LRU Cache is a data structure that stores a fixed number of items and removes the least recently used item when the cache is full.
• LRU Cache uses a combination of a doubly linked list and a hashmap to efficiently store and retrieve items.

• When an item is accessed, it is moved to the front of the linked list to indicate it is the most recently used item.

• If the cache is full, the least recently used item at the end of the ...read more
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Q1. 2 rounds, 2 coding questions in each round. Managerial round.
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Q1. What is ACID Prop?
Ans. 
ACID Prop stands for Atomicity, Consistency, Isolation, Durability properties in database transactions.
• Atomicity ensures that all operations in a transaction are completed successfully or none at all.

• Consistency ensures that the database remains in a consistent state before and after the transaction.

• Isolation ensures that multiple transactions can be executed concurrently without affecting each other.

• Durability ensures...read more
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Q2. WHAT IS ER Dia?
Ans. 
ER Dia stands for Entity-Relationship Diagram, a visual representation of entities and their relationships in a database.
• ER Dia is used to design databases by showing the entities (such as customers, products, orders) and the relationships between them.

• Entities are represented as rectangles, relationships as diamonds, and attributes as ovals.

• For example, in a library database, you may have entities like 'Book', 'Author...read more
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Q1. Basic Python Programming question with list, regex, strings
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Q1. Tell me about yourself
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Q2. What is the job culture of zopsmart
Ans. 
The job culture at Zopsmart is collaborative, innovative, and fast-paced.
• Collaborative work environment where team members support and help each other

• Emphasis on innovation and creativity in problem-solving

• Fast-paced atmosphere with opportunities for growth and learning

• Open communication and feedback encouraged

• Diverse and inclusive workplace culture
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Medium level leetcode problem

Q1. What's your motivation to join this team?
Ans. 
I am motivated to join this team because of the challenging work and the opportunity to learn and grow.
• I am excited about the projects this team is working on and the potential impact they can have.

• I am impressed by the team's expertise and collaborative approach.

• I am looking for a supportive and innovative work environment where I can contribute my skills and knowledge.

• I am eager to learn from my colleagues and develo...read more
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Q2. What are the projects/initiatives you have worked-on in your current role?
Ans. 
I have worked on multiple projects including developing a new e-commerce platform and implementing a machine learning algorithm for fraud detection.
• Developed a new e-commerce platform using React and Node.js

• Implemented a machine learning algorithm for fraud detection using Python and TensorFlow

• Collaborated with cross-functional teams to ensure project success

• Improved website performance by optimizing code and reducing
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Q1. Design VS code(any IDE)
Ans. 
Designing an IDE like VS code requires a deep understanding of software development and user experience.
• Identify the target audience and their needs

• Choose the programming languages and frameworks to support

• Create a user-friendly interface with customizable features

• Implement debugging and testing tools

• Ensure compatibility with different operating systems

• Continuously update and improve the IDE based on user feedback
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Q2. Discuss the architechture, limitations and abilities you would want in your app
Ans. 
The app architecture should be scalable, with a user-friendly interface and secure data storage.
• The app should have a modular architecture to allow for easy scalability and maintenance.

• The user interface should be intuitive and easy to navigate.

• The app should have robust security measures in place to protect user data.

• The app should be able to handle large amounts of data and traffic.

• The app should be compatible with m...read more
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Q3. The objective is not to code, but rather to discuss how would you implement certain features
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Q1. No coding involved but deep JavaScript, CSS, Browser, APIs related questions were asked
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Q2. Need to explain very minute details, explain working and uses
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Q3. What is a CDN? How does the browser work?
Ans. 
CDN stands for Content Delivery Network. Browser works by sending requests to servers and receiving responses.
• CDN is a network of servers that deliver content to users based on their geographic location.

• CDN reduces latency and improves website performance.

• Browser sends HTTP requests to servers and receives responses containing HTML, CSS, JS, and other assets.

• Browser renders the received content and displays it to the u
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Q4. CSS positioning
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Q5. Flexbox, Grid, Browser internals
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Q6. NO DSA question ❌
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You get 60 minutes to code an application in your choice of programming stack. Out of which 45 minutes are set aside for implementation and 15 minutes for problem discussion and conclusion.

Make sure that you think out loud while implementing the solution and not just silently coding.

Q1. Conclude the whole process, discuss salary expectations, perks, benefits, and other policy discussions
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