QUICK HEAL TECHNOLOGIES Senior Software Engineer Interview Questions, Process, and Tips

Mainly 4 Questions
1-2 MCQ
3: Create a class deriving from IReptile and return an object of HatchEgg which has Hatch Method. Hatch Method should return same IReptile object.
4) Sorting IDs in dictionary

Q1. The Interviewer was Very Rude and he doesn't care about the Requirements of Hiring a candidate. he was constantly asking about Other Companies Architectures and The things you did in them. instead of havin...read more
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Q2. SOLID, Interfaces , Boxing/Unboxing
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Q1. Find longest palindromic substring in a given string.
Ans. 
Use dynamic programming to find the longest palindromic substring in a given string.
• Iterate through the string and expand around each character to find palindromes.

• Store the length of the longest palindrome found so far.

• Return the substring based on the start and end indices of the longest palindrome.
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Q2. How to serialize and deserialise a tree
Ans. 
To serialize and deserialize a tree, use a recursive approach to traverse the tree and store the data in a suitable format.
• Use pre-order traversal to serialize the tree by storing the node values in a list or string.

• For deserialization, reconstruct the tree by recursively building nodes from the serialized data.

• Consider using JSON or XML format for serialization to easily store and retrieve tree structure.
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Q3. Find if a given regex (containing ., * and lower case english chars) matches a given string.
Ans. 
Use regex library to match given regex with string.
• Use a regex library like re in Python to match the given regex with the string.

• Check if the regex matches the string using the library functions.

• Handle cases where the regex contains special characters like . and * appropriately.
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Q4. Explain about throttling and implement throttle function.
Ans. 
Throttling is a technique used to control the rate of requests sent to a server.
• Throttling helps prevent server overload by limiting the number of requests processed at a time.

• Implementing a throttle function involves setting a maximum request rate and delaying excess requests.

• Example: Implementing a throttle function in a web application to limit the number of API calls made to a third-party service.

• Example: Throttlin...read more
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Q1. Find squares of elements in a sorted array and return the sorted response.
Ans. 
Sort the squares of elements in a sorted array and return the sorted response.
• Iterate through the array and square each element.

• Store the squared values in a new array.

• Sort the new array and return it.
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Q2. Write a short promise example and implement your own promise
Ans. 
A promise is a commitment to do something in the future, typically used for asynchronous operations in JavaScript.
• Promises are used to handle asynchronous operations in JavaScript.

• They represent a value that may be available now, in the future, or never.

• Promises have three states: pending, fulfilled, or rejected.

• Example: new Promise((resolve, reject) => { setTimeout(() => resolve('Done!'), 1000); });
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Q3. Explain event loop, what are different types of queues in event loop
Ans. 
Event loop is a mechanism that allows for asynchronous execution of code by managing the order of events in a single thread.
• Event loop continuously checks the call stack for any functions that need to be executed, and processes them in a non-blocking manner.

• Different types of queues in event loop include microtask queue (Promise callbacks), macrotask queue (setTimeout, setInterval callbacks), and animation frame queue
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Q4. What is virtual DOM and why its faster
Ans. 
Virtual DOM is a lightweight copy of the actual DOM, used to improve performance by minimizing direct manipulation of the real DOM.
• Virtual DOM is a concept used in frameworks like React to optimize rendering performance.

• Changes are first made to the virtual DOM, which is then compared to the real DOM to identify the minimal updates needed.

• This approach reduces the number of actual DOM manipulations, resulting in faster...read more
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Q1. How does the CAN TP (Controller Area Network Transport Protocol) work?
Ans. 
CAN TP is a protocol used for transferring large data packets over Controller Area Network.
• CAN TP breaks large data packets into smaller segments for transmission

• It uses flow control mechanisms to ensure all segments are received and retransmits if necessary

• CAN TP is commonly used in automotive and industrial applications
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Q1. Explain autosar layer
Ans. 
AUTOSAR (Automotive Open System Architecture) is a standardized software architecture for automotive systems.
• AUTOSAR is a layered architecture consisting of four layers: Application Layer, Runtime Environment (RTE) Layer, Basic Software Layer, and Microcontroller Abstraction Layer (MCAL).

• Each layer in AUTOSAR has specific responsibilities and interfaces with other layers to ensure modularity and reusability of software...read more
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Q1. Are you prepared to work from home?
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Q1. What is BDD and TDD
Ans. 
BDD stands for Behavior Driven Development and TDD stands for Test Driven Development.
• BDD focuses on the behavior of the system from the user's perspective.

• TDD focuses on writing tests before writing the actual code.

• BDD uses natural language to describe the behavior of the system.

• TDD helps in ensuring that the code meets the requirements and is well-tested.

• Both BDD and TDD help in improving the quality of the software
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Q2. What is JUnit and Mockito
Ans. 
JUnit is a unit testing framework for Java, while Mockito is a mocking framework used for creating mock objects in unit tests.
• JUnit is used for writing and running repeatable automated tests to ensure code behaves as expected.

• Mockito is used to create mock objects to simulate the behavior of real objects in unit tests.

• Both JUnit and Mockito are commonly used in test-driven development (TDD) to ensure code quality and r
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Q3. What is microservices architecture
Ans. 
Microservices architecture is an architectural style that structures an application as a collection of loosely coupled services.
• Each service is self-contained and can be developed, deployed, and scaled independently.

• Services communicate with each other over lightweight protocols like HTTP or messaging queues.

• Microservices allow for flexibility, scalability, and easier maintenance compared to monolithic architectures.

• Ex...read more
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Q4. Why HashSet has default size 16
Ans. 
HashSet default size 16 for performance balance between memory usage and lookup time.
• Default size 16 provides a good balance between memory usage and lookup time.

• Choosing a power of 2 size helps in distributing elements evenly across buckets.

• Resizing the HashSet is expensive, so starting with a larger size reduces the need for resizing.

• Example: If the default size was too small, it would lead to more collisions and deg
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Q5. What is diff between ActiveMQ and RabbitMQ
Ans. 
ActiveMQ is Java-based messaging broker while RabbitMQ is a message broker that implements the Advanced Message Queuing Protocol (AMQP).
• ActiveMQ is written in Java and supports multiple messaging protocols like OpenWire, STOMP, MQTT, and AMQP.

• RabbitMQ is written in Erlang and specifically implements the AMQP protocol.

• ActiveMQ is more feature-rich and has a larger user base, while RabbitMQ is known for its reliability a...read more
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Q6. What are databases are present in Azure DB
Ans. 
Azure DB offers various databases including SQL Database, Cosmos DB, MySQL, PostgreSQL, and MariaDB.
• SQL Database

• Cosmos DB

• MySQL

• PostgreSQL

• MariaDB
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Q7. Diff between HashSet and HashMap

Ans. 

HashSet is a collection of unique elements, while HashMap is a key-value pair collection.

• HashSet does not allow duplicate elements, HashMap allows duplicate keys but not duplicate values.

• HashSet uses Set interface, HashMap uses Map interface.

• Example: HashSet set = new HashSet<>(); HashMap map = new HashMap<>();

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