10+ Senior Software Engineer 2 Interview Questions and Answers for Freshers

Node.js is a runtime environment that executes JavaScript code outside of a web browser, using an event-driven, non-blocking I/O model.

• Node.js uses the V8 JavaScript engine to execute code.

• It uses an event-driven architecture to handle asynchronous operations.

• Node.js uses a single-threaded event loop to process multiple requests concurrently.

• Callbacks are used to handle asynchronous operations in Node.js.

• Node.js provides modules like 'fs' for file system operations and 'http'...read more

Find the number of days until a warmer temperature for each day in a list of daily temperatures.

• Use a stack to keep track of indices of temperatures.

• Iterate through the temperature array from left to right.

• For each temperature, pop from the stack until the current temperature is warmer.

• The difference in indices gives the number of days until a warmer temperature.

• Example: For temperatures [73, 74, 75, 71, 69, 72, 76, 73], the output is [1, 1, 4, 2, 1, 1, 0, 0].

Led a successful migration of a legacy system to a cloud-based architecture, enhancing performance and scalability.

• Conducted a thorough assessment of the existing legacy system to identify dependencies and potential challenges.

• Developed a detailed migration plan, including timelines, resource allocation, and risk management strategies.

• Utilized AWS services to migrate databases, ensuring data integrity and minimal downtime during the transition.

• Implemented automated testing to...read more

Test cases for a dummy website include checking functionality, usability, security, and performance.

• Verify that all links and buttons are working correctly

• Test user registration and login functionality

• Check for proper error messages when entering invalid data

• Test the website's responsiveness on different devices

• Ensure that user data is stored securely

• Perform load testing to check website performance under heavy traffic

DNS in Linux environment is a system that translates domain names to IP addresses.

• DNS stands for Domain Name System

• It is responsible for translating human-readable domain names (like google.com) into IP addresses (like 172.217.7.238)

• DNS servers store DNS records which contain information about domain names and their corresponding IP addresses

• Linux systems use DNS to resolve domain names to IP addresses when connecting to the internet

Design scalable architecture for file storage and sharing for millions of users

• Use distributed storage system like AWS S3 or Google Cloud Storage

• Implement sharding to distribute load across multiple servers

• Use CDN for faster file access and delivery

• Implement strong encryption for data security

• Use efficient indexing and caching mechanisms for quick file retrieval

Design a video streaming platform

• Consider the scalability and performance requirements

• Implement a content delivery network (CDN) to distribute video content

• Use adaptive streaming techniques to optimize video quality based on network conditions

• Implement user authentication and authorization mechanisms

• Design a robust video encoding and transcoding system

• Implement a recommendation engine to suggest relevant videos

• Ensure secure video streaming by using encryption and DRM

• Implement...read more

MVC is a design pattern that separates an application into Model, View, and Controller components. MVVM is a variation of MVC that adds a ViewModel component.

• MVC separates the application into three components: Model (data and business logic), View (user interface), and Controller (handles user input and updates the model and view).

• MVVM is a variation of MVC that adds a ViewModel component, which acts as an intermediary between the Model and View.

• In MVVM, the ViewModel expose...read more

A meeting scheduler to manage and organize meetings efficiently

• Allow users to input meeting details such as date, time, duration, and participants

• Provide options to check availability of participants and suggest available time slots

• Send notifications and reminders to participants

• Integrate with calendar apps for easy scheduling and tracking

Different types of testing include unit testing, integration testing, system testing, and acceptance testing.

• Unit testing focuses on testing individual components or functions in isolation.

• Integration testing verifies that different components work together correctly.

• System testing tests the entire system as a whole.

• Acceptance testing ensures that the system meets the requirements and is ready for deployment.