FIS India Frontend Engineer Interview: Rounds, Questions and Preparation

What the job involves

Frontend Engineers at global tech firms like FIS India build and maintain user interfaces for web applications, often in fintech or enterprise software. They work with designers and backend engineers to translate requirements into responsive, accessible, and performant UI components. Day to day involves writing clean HTML, CSS, and JavaScript, debugging cross-browser issues, and collaborating in Agile teams.

Role and Technical Knowledge

1. 1

   Explain the difference between null and undefined in JavaScript.

   Define both: undefined means a variable has been declared but not assigned, null is an intentional absence of value. Mention that typeof null returns 'object' and how they behave in comparisons.

2. 2

   How does the CSS box model work, and what is the difference between content-box and border-box?

   Describe content, padding, border, margin. Explain that border-box includes padding and border in the element's total width/height, while content-box does not. Give a practical example of why border-box is often preferred.

3. 3

   What are React hooks, and why were they introduced?

   Explain that hooks let function components use state and lifecycle features without classes. Mention useState, useEffect, and rules of hooks. Note that they improve code reuse and readability.

4. 4

   How do you make a web page responsive?

   Cover fluid grids, flexible images, media queries, and relative units. Mention mobile-first design and testing across breakpoints.

Practical Scenarios

1. 5

   You need to fetch data from an API and display it in a list. How would you handle loading and error states?

   Describe using fetch or axios, setting loading to true before the request, and updating state on success or error. Mention showing a spinner and an error message, and cleaning up in useEffect if using React.

2. 6

   A page is loading slowly. What steps would you take to improve performance?

   Suggest minifying assets, lazy loading images, code splitting, caching, and reducing HTTP requests. Mention using Lighthouse to identify bottlenecks.

3. 7

   How would you ensure your UI is accessible to screen readers?

   Talk about semantic HTML, ARIA roles and labels, keyboard navigation, and color contrast. Mention testing with tools like axe or screen readers.

4. 8

   You are asked to build a form with validation. How would you approach it?

   Explain controlled components, real-time validation, error messages, and preventing submission on invalid data. Mention using libraries like Formik or React Hook Form if appropriate.

Behavioural and HR

1. 9

   Tell me about a time you worked in a team to deliver a project.

   Use the STAR method: describe the situation, your task, the actions you took, and the result. Highlight collaboration and communication.

2. 10

   Describe a challenging bug you fixed. How did you approach it?

   Show your debugging process: reproducing the issue, using dev tools, isolating the cause, and testing the fix. Emphasize persistence and learning.

3. 11

   Why do you want to work as a Frontend Engineer at a global tech company?

   Connect your interest in user experience and web technologies to the company's scale and impact. Mention eagerness to learn and contribute to products used worldwide.

4. 12

   How do you handle feedback on your code?

   Show openness to code reviews, willingness to learn from senior engineers, and a focus on improving code quality. Give an example of incorporating feedback.

Company and Sector Awareness

1. 13

   What do you know about the fintech industry and how frontend engineering contributes to it?

   Mention security, real-time data, and user trust. Explain that frontend engineers build secure, responsive interfaces for banking and trading platforms.

2. 14

   How would you handle sensitive user data in a frontend application?

   Discuss avoiding storing sensitive data in local storage, using HTTPS, sanitizing inputs, and following security best practices like Content Security Policy.

3. 15

   What frontend trends or technologies are you excited about?

   Talk about modern frameworks, WebAssembly, progressive web apps, or accessibility advancements. Relate them to potential use in enterprise software.

4. 16

   Why should we hire you as a fresher for this role?

   Summarize your technical skills, projects, and enthusiasm. Highlight your ability to learn quickly and adapt to new technologies.