Droom Associate Software Engineer Interview Questions and Answers

Q1. Design Questions to build a scalable micro service
Ans. 
Design a scalable microservice architecture for handling high traffic and data efficiently.
• Use stateless services to allow easy scaling; e.g., RESTful APIs that don't store session data.

• Implement load balancing to distribute traffic evenly across instances; e.g., using Nginx or AWS ELB.

• Utilize containerization (Docker) for consistent environments and easy deployment.

• Incorporate a service registry (like Consul) for serv...read more
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Q2. Salary Discussion
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Easy to medium, can solve with leetcode medium

Q1. Number of islands count
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Q2. First and last index of a particular element in an array
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Q1. DSA - level order traversal, sliding window.
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Q1. Atomic transaction in distributed system
Ans. 
Atomic transactions ensure that all operations in a transaction are completed successfully or none at all in a distributed system.
• Atomic transactions guarantee that all operations within a transaction are either all successful or all rolled back.

• In distributed systems, atomic transactions are crucial for maintaining data consistency across multiple nodes.

• ACID properties (Atomicity, Consistency, Isolation, Durability) a...read more
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Computer Fundamentals

Q1. Flatten a binary tree
Ans. 
Flatten a binary tree by converting it into a linked list in-place.
• Use a recursive approach to flatten the binary tree.

• Traverse the tree in a pre-order manner and keep track of the previous node.

• Set the left child of each node to null and the right child to the next node in the linked list.

• Example: Input: 1 -> 2 -> 5 -> 3 -> 4 -> null, Output: 1 -> null -> 2 -> null -> 3 -> null -> 4 -> null -> 5 -> null
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Leecode medium level question

Leetcode Hard level Question

Q1. This is cto round asked some interview questions
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Q1. Delete nth node from end in linked list
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Q2. Project discussion
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Q1. Program for a palindrome Number.
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Q2. React Lifecycle methods
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Q3. Hooks in react?
Ans. 
Hooks are a feature in React that allow you to use state and other React features in functional components.
• Hooks were introduced in React 16.8.

• They allow you to use state and other React features without writing a class.

• Commonly used hooks include useState, useEffect, useContext, and useReducer.

• Hooks must be used at the top level of your functional component.

• Example: const [count, setCount] = useState(0);
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Q1. Create a High-level design
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Design a high-level architecture for a software system
• Identify the main components of the system

• Define the interactions between the components

• Consider scalability, security, and performance

• Choose appropriate technologies and frameworks

• Create a diagram to visualize the architecture
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Q2. Questions on the design you created
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