Senior Software Engineer L2
Senior Software Engineer L2 Interview Questions and Answers
Q1. What is the difference between SQL and NoSQL?
SQL is a relational database management system that uses structured query language, while NoSQL is a non-relational database system that does not use SQL.
SQL databases are table-based and have a predefined schema, while NoSQL databases are document-based, key-value pairs, graph databases, or wide-column stores.
SQL databases are vertically scalable, while NoSQL databases are horizontally scalable.
SQL databases are good for complex queries and transactions, while NoSQL database...read more
Q2. What is a class? What is an object
A class is a blueprint for creating objects in object-oriented programming. An object is an instance of a class.
A class defines the properties and behaviors of objects.
An object is a specific instance of a class.
Classes can be used to create multiple objects with similar characteristics.
Objects can interact with each other by calling methods defined in their class.
Example: Class 'Car' can have properties like 'color' and 'model', while an object of class 'Car' can be 'Toyota ...read more
Q3. What is Singleton Design Pattern?
Singleton Design Pattern ensures a class has only one instance and provides a global point of access to it.
Ensures a class has only one instance by providing a global access point to it
Commonly used in scenarios where only one instance of a class is needed, such as database connections or configuration settings
Implemented by making the constructor private and providing a static method to access the single instance
Q4. How do we create objects?
Objects in programming are created by defining a class and instantiating it to create instances of that class.
Define a class with attributes and methods
Instantiate the class to create an object
Access and manipulate object properties and methods
Q5. What are Columnar Databases?
Columnar databases store data in columns rather than rows, allowing for faster query performance and better compression.
Data is stored in columns rather than rows
Better suited for analytical queries
Allows for better compression and faster query performance
Examples include Amazon Redshift, Google BigQuery
Q6. What is a Pub-Sub model?
Pub-Sub model is a messaging pattern where senders (publishers) of messages do not program the messages to be sent directly to specific receivers (subscribers).
Publishers send messages to a central topic or channel
Subscribers subscribe to the topic or channel to receive messages
Decouples senders and receivers, allowing for scalability and flexibility
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Q7. How to handle dynamic table on webpage
Use XPath or CSS selectors to locate elements and extract data from the table dynamically.
Identify unique attributes of the table such as class, id, or structure
Use XPath or CSS selectors to locate the table and its elements
Iterate through rows and columns to extract data dynamically
Handle pagination or lazy loading if applicable
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