EY
Ernst & Young Global Limited, a multinational professional services partnership.
4 Rounds
~21 Days
Medium
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
Full Stack Engineer
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Behavioral
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medium
Tell me about a time you had to explain a complex technical issue to a non-technical stakeholder, such as a client or an audit partner.
#Stakeholder Management
#Soft Skills
Full Stack Engineer
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Behavioral
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medium
Describe a time you disagreed with a team member or tech lead on a technical approach. How did you resolve it?
#Conflict Resolution
#Teamwork
Full Stack Engineer
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Behavioral
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medium
Working at EY means handling highly sensitive financial data. How do you ensure compliance and data security when developing a new feature?
#Security
#Best Practices
#SDLC
Full Stack Engineer
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Behavioral
•
medium
Tell me about a time you had to deliver a project under a very tight deadline. How did you prioritize your tasks?
#Prioritization
#Stress Management
Full Stack Engineer
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Behavioral
•
medium
Give an example of a time you identified a bottleneck in a development process or application and took the initiative to improve it.
#Initiative
#Problem Solving
#Process Improvement
Full Stack Engineer
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Behavioral
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easy
Why do you want to work at EY? What interests you about building software in the technology consulting and financial services space?
#Motivation
#Company Knowledge
Full Stack Engineer
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Behavioral
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medium
Tell me about a time you had to learn a completely new technology stack or framework very quickly to meet a client's requirement.
#Continuous Learning
#Flexibility
Full Stack Engineer
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Coding
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easy
Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would have exactly one solution.
#Arrays
#Hash Maps
Full Stack Engineer
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Coding
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easy
Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
#Strings
#Stacks
Full Stack Engineer
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Coding
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medium
Write a SQL query to find the second highest transaction amount from a 'Transactions' table. If there is no second highest amount, return null.
#Databases
#Queries
Full Stack Engineer
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Coding
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medium
Build a React component that fetches a list of users from an API and displays them in a table with server-side pagination.
#React
#API Integration
#State Management
Full Stack Engineer
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Coding
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medium
Given a binary search tree (BST), find the lowest common ancestor (LCA) node of two given nodes in the BST.
#Trees
#Recursion
Full Stack Engineer
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Coding
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medium
Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cover all the intervals in the input.
#Arrays
#Sorting
Full Stack Engineer
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Coding
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medium
Write a middleware function in Express.js (or ASP.NET Core) to rate-limit incoming API requests by IP address to prevent abuse.
#Node.js
#Middleware
#Security
Full Stack Engineer
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Coding
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medium
Given a string s, find the length of the longest substring without repeating characters.
#Strings
#Sliding Window
#Hash Maps
Full Stack Engineer
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Coding
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medium
Write a SQL query using window functions to calculate a running total of expenses per department, ordered by the date of the expense.
#Databases
#Window Functions
Full Stack Engineer
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Coding
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medium
Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically.
#Graphs
#DFS
#BFS
Full Stack Engineer
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Coding
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medium
Write a debounce function in JavaScript from scratch. Explain how it works and provide a practical use case in a React application.
#JavaScript
#Closures
#Performance
Full Stack Engineer
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System Design
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hard
Design a secure document upload and processing system for enterprise tax documents. The system must handle large files, scan for malware, and extract text via OCR.
#Cloud Storage
#Security
#Asynchronous Processing
#Microservices
Full Stack Engineer
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System Design
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medium
Design an immutable audit logging microservice for EY's internal financial tools that must handle millions of events per day and be easily queryable for compliance audits.
#Microservices
#Databases
#Scalability
Full Stack Engineer
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System Design
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hard
Design a real-time collaborative spreadsheet application (similar to Excel Online) for financial modeling teams.
#WebSockets
#Concurrency
#Real-time Systems
Full Stack Engineer
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System Design
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medium
Design a distributed caching layer for a high-traffic financial reporting application to reduce database load.
#Caching
#Redis
#Performance
Full Stack Engineer
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System Design
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medium
Design a notification system that alerts EY consultants via email and in-app push notifications when a client uploads a new compliance document.
#Pub/Sub
#Notifications
#Scalability
Full Stack Engineer
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System Design
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hard
Design a scalable API Gateway for EY's internal suite of HR and resource management tools. It needs to handle routing, authentication, and rate limiting.
#API Gateway
#Microservices
#Security
Full Stack Engineer
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Technical
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medium
Explain the JavaScript Event Loop. How does it handle asynchronous operations like Promises and setTimeout?
#JavaScript
#Asynchronous Programming
#Architecture
Full Stack Engineer
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Technical
•
medium
How does React's Virtual DOM work, and why is it considered faster than manipulating the Real DOM directly?
#React
#Performance
#DOM
Full Stack Engineer
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Technical
•
medium
How do you implement and secure JWT (JSON Web Token) authentication in a Node.js or .NET Core backend?
#Authentication
#Backend
#JWT
Full Stack Engineer
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Technical
•
medium
Explain the difference between Clustered and Non-Clustered Indexes in a relational database like SQL Server.
#SQL
#Performance Optimization
#Data Structures
Full Stack Engineer
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Technical
•
medium
Walk me through how you would deploy a containerized full-stack application (React frontend, Node.js backend, PostgreSQL) to Microsoft Azure.
#Azure
#Docker
#Deployment
Full Stack Engineer
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Technical
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medium
Compare REST and GraphQL. When would you choose to use GraphQL over REST for a client-facing dashboard?
#REST
#GraphQL
#Architecture
Full Stack Engineer
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Technical
•
medium
What is CSRF (Cross-Site Request Forgery) and how do you prevent it in a modern Single Page Application (SPA)?
#Web Security
#Frontend
#Backend
Full Stack Engineer
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Technical
•
medium
Compare Redux, the React Context API, and modern alternatives like Zustand or Recoil for state management in a large-scale React application.
#React
#State Management
#Architecture
Full Stack Engineer
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Technical
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hard
Explain the Saga pattern. How would you handle distributed transactions across multiple microservices where one step fails?
#Microservices
#Distributed Systems
#Patterns
Full Stack Engineer
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Technical
•
medium
Describe your approach to testing a full-stack application. What tools do you use for Unit, Integration, and End-to-End (E2E) testing?
#QA
#Unit Testing
#E2E
Full Stack Engineer
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Technical
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medium
Explain the CI/CD pipeline you would set up for a modern web application (React frontend, Node.js API). What stages would you include?
#CI/CD
#Automation
#Git
Difficulty Radar
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Senior EngineerFocuses on core competencies, system constraints, and clear communication.
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Think Out Loud
Always explain your thought process before writing code or drawing architecture.