Senior Sdet Software Engineer Interview Questions and Answers

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

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 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

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

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.