Moris Media Senior Front end Developer Interview Questions and Answers

Refactored a large codebase by breaking it down into smaller modules, improving readability and maintainability.

• Analyzed the existing codebase to identify redundant or inefficient code

• Broke down the code into smaller, more manageable modules

• Implemented design patterns such as MVC or MVVM to improve code structure

• Refactored code incrementally, testing each change to ensure functionality was not affected

• Documented changes and updated comments to improve code readability

Optimizing web application performance involves various strategies like minification, caching, lazy loading, and image optimization.

• Minify CSS, JavaScript, and HTML files to reduce file sizes and improve load times.

• Implement browser caching to store static resources locally and reduce server requests.

• Utilize lazy loading to defer loading of non-essential resources until they are needed.

• Optimize images by resizing, compressing, and using modern image formats like WebP.

• Reduce H...read more

Integrated complex front-end features with a back-end system in a challenging project.

• Developed a real-time chat feature using WebSockets to communicate with the back-end server

• Faced challenges with data synchronization and ensuring seamless updates across all clients

• Implemented RESTful APIs to fetch and update data from the back-end

• Used Redux for state management to handle complex data flows

• Performed thorough testing and debugging to ensure smooth integration

State management in complex front-end applications involves using tools like Redux or Context API to centralize and manage application state efficiently.

• Use tools like Redux or Context API to centralize and manage state

• Implement state management patterns like Flux architecture to ensure data flow consistency

• Optimize state updates by using selectors to prevent unnecessary re-renders

• Use middleware like Thunk or Saga for handling asynchronous actions

• Monitor state performance usi...read more

I approach designing for accessibility by following best practices and guidelines to ensure all users can access and use the application.

• I use semantic HTML to provide structure and context for screen readers

• I ensure all interactive elements are keyboard accessible

• I use ARIA attributes to enhance accessibility for users with disabilities

• I conduct usability testing with users who have disabilities to gather feedback and make improvements

• Example: I implemented focus styles and ...read more

Key considerations for implementing responsive design include fluid grids, flexible images, media queries, and testing across various devices.

• Use fluid grids to ensure content adapts to different screen sizes

• Utilize flexible images that scale appropriately

• Implement media queries to apply different styles based on screen size

• Test the design across multiple devices to ensure consistent user experience

I use Git for version control and collaborate with team members through branches and pull requests.

• Utilize Git for version control to track changes and collaborate with team members

• Create separate branches for different features or bug fixes to prevent conflicts

• Regularly pull changes from the main branch to stay up to date with the latest code

• Resolve code conflicts by communicating with team members and carefully merging changes

• Use pull requests for code reviews and to ensure...read more

I handle cross-browser compatibility by testing on multiple browsers, using polyfills, and CSS resets.

• Test on multiple browsers to identify and fix issues

• Use polyfills to provide missing functionality in older browsers

• Utilize CSS resets to ensure consistent styling across browsers

• Example: Had to fix layout issues in Internet Explorer by adjusting CSS properties