10+ Senior Sdet Software Engineer Interview Questions and Answers

Identify the user with the most recent login attempt to determine who accessed the website last.

• Collect login attempt data, including timestamps and user identifiers.

• Sort the login attempts by timestamp in descending order.

• Select the first entry from the sorted list to find the last user who accessed the website.

• Example: If login attempts are [{user: 'A', time: '2023-10-01T10:00:00'}, {user: 'B', time: '2023-10-01T10:05:00'}], user 'B' accessed last.

Solid understanding of OOP concepts and recursion problem-solving skills are essential for a Senior SDET Software Engineer role.

• OOP concepts include encapsulation, inheritance, polymorphism, and abstraction.

• Recursion is a technique where a function calls itself to solve a problem.

• Understanding how to break down a problem into smaller subproblems and solve them recursively is key.

• Examples of recursion problems include factorial calculation, Fibonacci sequence, and tree travers...read more

XPath is a language for selecting nodes in an XML document, while CSS selectors are used to select HTML elements.

• XPath is more powerful and flexible than CSS selectors

• CSS selectors are faster and easier to write than XPath

• XPath can traverse both upwards and downwards in the document tree, while CSS selectors can only traverse downwards

• XPath can select elements based on their attributes, text content, and more, while CSS selectors are limited to selecting elements based on the...read more

Design an ATM machine with detailed low-level design

• Separate modules for user authentication, transaction processing, and cash dispensing

• Use secure encryption for PIN entry and data transmission

• Implement error handling for invalid inputs and transaction failures

• Include a receipt printer for transaction records

• Design a user-friendly interface with options for balance inquiry, cash withdrawal, and fund transfer

System design and design principles

• Understand the problem and requirements

• Identify the key components and their interactions

• Follow SOLID principles for modular and maintainable design

• Consider scalability, performance, and fault tolerance

• Use appropriate design patterns and architectural styles

• Document the design and communicate with stakeholders

Design a simplified version of Twitter, focusing on user interactions, posts, and basic functionalities.

• User Registration: Users can sign up with a username and password.

• Post Creation: Users can create tweets (up to 280 characters).

• Feed: Users can view a feed of tweets from accounts they follow.

• Follow/Unfollow: Users can follow or unfollow other users.

• Like/Retweet: Users can like or retweet posts.

• Search: Users can search for tweets or users.

• Notifications: Users receive notifi...read more

SOLID principles are a set of five design principles that help make software designs more understandable, flexible, and maintainable.

• Single Responsibility Principle (SRP) - A class should have only one reason to change.

• Open/Closed Principle (OCP) - Software entities should be open for extension but closed for modification.

• Liskov Substitution Principle (LSP) - Objects of a superclass should be replaceable with objects of its subclasses without affecting the functionality.

• Inter...read more

Concerns are potential issues or problems that need to be addressed or resolved.

• Concerns can arise from various sources such as technical limitations, performance issues, security vulnerabilities, and user experience challenges.

• Identifying and addressing concerns early in the development process can help prevent larger issues down the line.

• Examples of concerns in software testing include compatibility with different devices and browsers, data security measures, and scalabilit...read more

Yes, relocation is possible for the right opportunity.

• I am open to relocating for the right job opportunity.

• I have relocated for previous roles and am willing to do so again.

• I am flexible and willing to consider relocation options.