EY

EY

Ernst & Young Global Limited, a multinational professional services partnership.

4 Rounds ~21 Days Medium
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The Interview Loop

Recruiter Screen (30 min)

Standard fit check, behavioral questions, and resume overview.

Technical Loop (3-4 Rounds)

Deep dive into domain knowledge, coding, and system design.

Interview Question Bank

Frontend Engineer • Behavioral • medium

Tell me about a time you had to push back on a client's unrealistic frontend feature request during a consulting engagement.

#Communication #Stakeholder Management #Consulting
Practice
Frontend Engineer • Behavioral • medium

Describe a time you had to explain a complex frontend architectural decision or technical debt to a non-technical EY partner or client.

#Communication #Leadership #Consulting
Practice
Frontend Engineer • Behavioral • medium

Tell me about a time you found a significant bug in production. How did you handle it and what steps did you take to prevent it from happening again?

#Problem Solving #Accountability #Agile
Practice
Frontend Engineer • Behavioral • easy

Tell me about a time you had to mentor a junior developer on your team who was struggling with a specific technology.

#Mentorship #Teamwork #Empathy
Practice
Frontend Engineer • Behavioral • medium

Tell me about a time you had to deliver a project with a very tight deadline. How did you ensure quality wasn't compromised?

#Time Management #Prioritization #Agile
Practice
Frontend Engineer • Coding • hard

Write a polyfill for `Promise.all`.

#Promises #Asynchronous #Polyfills
Practice
Frontend Engineer • Coding • medium

Implement a custom `useDebounce` React hook that we can use for a client search input in our tax auditing dashboard.

#React #Hooks #Performance
Practice
Frontend Engineer • Coding • easy

Write a JavaScript function to flatten a deeply nested array of varying depths without using the built-in `Array.prototype.flat()`.

#Recursion #Arrays #JavaScript
Practice
Frontend Engineer • Coding • medium

Implement an autocomplete search bar component in React that fetches data from an API as the user types.

#DOM Manipulation #Events #API Integration
Practice
Frontend Engineer • Coding • hard

Write a function to deep clone a JavaScript object. Ensure it handles circular references.

#Recursion #Memory Management #JavaScript Core
Practice
Frontend Engineer • Coding • easy

Implement a reusable Modal component in React from scratch.

#React #Portals #UI Components
Practice
Frontend Engineer • Coding • easy

Write a function to check if two strings are valid anagrams of each other.

#Strings #Hash Maps #Algorithms
Practice
Frontend Engineer • Coding • medium

Implement a `throttle` function in JavaScript.

#Closures #Timing #Performance
Practice
Frontend Engineer • Coding • medium

Implement a simple Event Emitter (pub/sub pattern) in JavaScript with `on`, `emit`, and `off` methods.

#Design Patterns #JavaScript Core
Practice
Frontend Engineer • Coding • easy

Write a JavaScript function that takes an array of objects and groups them by a specific property.

#Arrays #Objects #Data Manipulation
Practice
Frontend Engineer • Coding • medium

Implement a custom hook `useFetch` that takes a URL and returns `data`, `loading`, and `error` states. It should also handle component unmounting.

#React #Hooks #API Integration
Practice
Frontend Engineer • System Design • hard

Design a highly scalable data grid component for an enterprise financial dashboard that needs to render 100,000+ rows of audit data without crashing the browser.

#Architecture #Performance #Virtualization
Practice
Frontend Engineer • System Design • hard

Design a Micro-frontend architecture for an EY client portal where different service lines (Tax, Audit, Advisory) maintain their own UI modules.

#Micro-frontends #Webpack Module Federation #Architecture
Practice
Frontend Engineer • System Design • medium

Design a secure authentication flow for a client-facing web app. How do you securely store tokens on the client side?

#Authentication #JWT #Security
Practice
Frontend Engineer • System Design • hard

Design an interactive dashboard for visualizing real-time audit data streaming in from multiple global servers.

#WebSockets #Real-time #Architecture
Practice
Frontend Engineer • System Design • medium

Design a file upload component that supports drag-and-drop, progress bars, and chunking for large files (e.g., 2GB tax documents).

#Network #UI Components #File Handling
Practice
Frontend Engineer • System Design • medium

Design a global notification/toast system for a complex web application.

#Architecture #State Management #UI Components
Practice
Frontend Engineer • Technical • medium

Explain the JavaScript Event Loop. How does it handle microtasks versus macrotasks?

#Asynchronous #Event Loop #JavaScript Core
Practice
Frontend Engineer • Technical • medium

How do you handle state management in a large-scale React application? When would you choose Context API over Redux for an EY enterprise app?

#Redux #Context API #Architecture
Practice
Frontend Engineer • Technical • easy

Explain the difference between `interface` and `type` in TypeScript. When would you use one over the other?

#TypeScript #Typing
Practice
Frontend Engineer • Technical • medium

How do you optimize a React application that is experiencing performance bottlenecks while rendering a large list of financial records?

#React #Performance #Optimization
Practice
Frontend Engineer • Technical • easy

What is CSS Specificity and how do you prevent CSS conflicts in a large, multi-team project?

#CSS #Styling #Architecture
Practice
Frontend Engineer • Technical • medium

EY works with many government and enterprise clients. How do you ensure your frontend applications are accessible and WCAG compliant?

#A11y #WCAG #HTML
Practice
Frontend Engineer • Technical • medium

Explain Server-Side Rendering (SSR) vs Client-Side Rendering (CSR). When would you recommend SSR for a project?

#Next.js #Rendering #Performance
Practice
Frontend Engineer • Technical • easy

How does the Virtual DOM work in React, and why is it considered faster than manipulating the real DOM directly?

#React Core #Reconciliation
Practice
Frontend Engineer • Technical • medium

Describe your experience with CI/CD pipelines for frontend deployments. What steps do you typically include?

#Pipelines #Testing #Deployment
Practice
Frontend Engineer • Technical • hard

What are React Server Components (RSC) and how do they differ from traditional Server-Side Rendering (SSR)?

#React 18 #Architecture #Performance
Practice
Frontend Engineer • Technical • medium

How do you manage side effects in Redux? Compare Redux Thunk and Redux Saga.

#Redux #Middleware #Asynchronous
Practice
Frontend Engineer • Technical • medium

How do you handle Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF) in a modern frontend application?

#Security #Web Fundamentals
Practice
Frontend Engineer • Technical • medium

Explain the concept of Closures in JavaScript. Provide a practical use case where you would use a closure in a frontend app.

#JavaScript Core #Scope
Practice

Difficulty Radar

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Meet Your Interviewers

The "Standard" Interviewer

Senior Engineer

Focuses on core competencies, system constraints, and clear communication.

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Unwritten Rules

Think Out Loud

Always explain your thought process before writing code or drawing architecture.

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