Deloitte
Multinational professional services network with offices in over 150 countries.
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
Backend Engineer
•
System Design
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hard
Design a scalable REST API for a financial reporting dashboard used by enterprise clients. The data is updated nightly but queried heavily during business hours.
#API Design
#Caching
#Database Read Replicas
Backend Engineer
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System Design
•
medium
Design a notification system that sends emails, SMS, and push notifications to users based on system events.
#Microservices
#Asynchronous Processing
#Third-party Integrations
Backend Engineer
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System Design
•
hard
How would you design a system to process and ingest millions of daily transaction records from various retail clients in different formats?
#Data Ingestion
#ETL
#Event-Driven Architecture
Backend Engineer
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System Design
•
hard
Design a distributed rate limiter for a public-facing API to prevent abuse and enforce client-tier quotas.
#Distributed Systems
#Algorithms
#Redis
Backend Engineer
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System Design
•
medium
Design a URL shortener service (like bit.ly). Focus on the database schema and the URL generation algorithm.
#Hashing
#Database Design
#Scalability
Data Engineer
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System Design
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hard
Design a real-time streaming pipeline to detect fraudulent credit card transactions. The system must process 10,000 events per second with sub-second latency.
#Streaming
#Kafka
#Spark Streaming
#Fraud Detection
Data Engineer
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System Design
•
medium
Design an ELT pipeline for a retail company that receives daily CSV dumps from 50 different vendors via SFTP. The data needs to be loaded into Snowflake for reporting.
#ELT
#Cloud Architecture
#Data Ingestion
Data Engineer
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System Design
•
medium
You are extracting data from a third-party REST API that has a strict rate limit of 100 requests per minute. How do you design your Python extraction script to handle this?
#API Integration
#Python
#Rate Limiting
Data Scientist
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System Design
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hard
How would you design a real-time credit card fraud detection system? Focus on latency, feature stores, and model serving.
#Real-time ML
#Fraud Detection
#Streaming
Data Scientist
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System Design
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hard
Propose a Generative AI architecture using Retrieval-Augmented Generation (RAG) to help Deloitte auditors query hundreds of lengthy financial reports securely.
#GenAI
#RAG
#Vector Databases
#Security
Data Scientist
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System Design
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hard
Design a dynamic pricing model for a logistics and supply chain client. What data would you need, and how would you optimize the objective function?
#Optimization
#Dynamic Pricing
#Supply Chain
Data Scientist
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System Design
•
medium
Walk me through how you would deploy a machine learning model on AWS or Azure to ensure it scales automatically with varying client traffic.
#Cloud Computing
#Model Deployment
#Scalability
Data Scientist
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System Design
•
medium
Architect a recommendation engine for a retail client's e-commerce platform. How do you handle the cold start problem for new users and new items?
#Recommendation Systems
#Collaborative Filtering
#Cold Start
Data Scientist
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System Design
•
hard
Design a document intelligence system to automatically extract key clauses and entities from unstructured legal contracts for an audit client.
#NLP
#OCR
#Information Extraction
Data Scientist
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System Design
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hard
Design an end-to-end machine learning pipeline to predict employee attrition for a large HR consulting client. Walk me through data ingestion to deployment.
#End-to-End ML
#HR Analytics
#Pipeline Design
Frontend Engineer
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System Design
•
medium
Design a file upload component that supports drag-and-drop, chunking for large files, and progress tracking.
#File Handling
#Network Requests
#UI/UX
Frontend Engineer
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System Design
•
hard
Design a scalable Micro-frontend architecture for a large banking client transitioning from a monolithic Angular application.
#Micro-frontends
#Architecture
#Webpack Module Federation
Frontend Engineer
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System Design
•
medium
Design an autocomplete search component for an e-commerce client. It needs to handle high traffic, cache results, and display rich UI dropdowns.
#Component Design
#Caching
#Debouncing
#Accessibility
Frontend Engineer
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System Design
•
medium
Design the state management architecture for a large-scale e-commerce Single Page Application. Would you choose Redux, Context API, Zustand, or something else?
#State Management
#Architecture
#React
Frontend Engineer
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System Design
•
medium
Design a secure authentication flow using JWT and OAuth2 in a React application. Where do you store the tokens?
#Authentication
#Security
#OAuth
Frontend Engineer
•
System Design
•
medium
Design a scalable form validation architecture for a complex multi-step wizard used in a government tax portal.
#Forms
#Validation
#State Management
Frontend Engineer
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System Design
•
hard
Design a real-time collaborative text editor (like Google Docs) for a corporate intranet.
#WebSockets
#Operational Transformation
#Real-time
Full Stack Engineer
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System Design
•
medium
Design a URL shortener service like Bitly.
#Hashing
#Database
#Caching
#Load Balancing
Full Stack Engineer
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System Design
•
hard
Design a secure document management system for a federal government client.
#Security
#RBAC
#Blob Storage
#Compliance
Full Stack Engineer
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System Design
•
medium
Design a real-time chat application like Microsoft Teams or Slack.
#WebSockets
#Real-time
#Database
#Pub/Sub
Full Stack Engineer
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System Design
•
hard
How would you approach migrating a legacy monolithic application to a microservices architecture for a large financial client?
#Microservices
#Migration
#Strangler Pattern
#Enterprise Architecture
Full Stack Engineer
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System Design
•
hard
Design a scalable e-commerce checkout system that handles high traffic during events like Black Friday.
#Scalability
#Payments
#Microservices
#Message Queues
Machine Learning Engineer
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System Design
•
medium
Design a scalable machine learning pipeline on AWS to process daily batch predictions for retail inventory forecasting.
#AWS
#Batch Processing
#Architecture
Machine Learning Engineer
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System Design
•
hard
Design a personalized recommendation engine for an e-commerce client. How do you handle the cold start problem for new users and new items?
#Recommendation Systems
#Collaborative Filtering
#Cold Start
Machine Learning Engineer
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System Design
•
hard
What is your strategy for optimizing the inference latency and cost of a Large Language Model (LLM) deployed in production?
#LLMOps
#Model Optimization
#Quantization
Machine Learning Engineer
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System Design
•
hard
Design a Retrieval-Augmented Generation (RAG) system for a client's internal legal documents. How do you ensure the system doesn't hallucinate?
#RAG
#Vector Databases
#LLMs
Machine Learning Engineer
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System Design
•
hard
How would you design a real-time fraud detection system for credit card transactions with a strict latency requirement of <50ms?
#Real-time Inference
#Streaming
#Low Latency
Machine Learning Engineer
•
System Design
•
hard
Design a document extraction system using OCR and NLP to process thousands of unstructured invoices per day for an auditing client.
#NLP
#OCR
#Document AI
#Pipelines
Product Manager
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System Design
•
hard
Design an architecture for a secure, multi-tenant financial reporting dashboard for Deloitte's audit clients.
#Multi-tenancy
#Security
#Data Visualization
Product Manager
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System Design
•
hard
Design a real-time fraud detection system for a banking client. What data points do you need?
#Machine Learning
#FinTech
#Real-time Processing
Product Manager
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System Design
•
hard
Design an automated document parsing and data extraction pipeline for Deloitte's M&A due diligence team.
#OCR
#NLP
#Data Pipelines
Product Manager
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System Design
•
medium
Design a scalable appointment booking system for a government healthcare portal.
#Scalability
#Public Sector
#Concurrency
Product Manager
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Technical
•
easy
Explain the difference between microservices and a monolithic architecture, and when you would recommend each to a client.
#Architecture
#Microservices
#Client Advisory
Software Engineer
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System Design
•
medium
How would you design a centralized logging and monitoring system for a distributed microservices application?
#Observability
#ELK Stack
#Distributed Systems
Software Engineer
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System Design
•
easy
Design a RESTful API for a library management system. What endpoints would you create?
#API Design
#Data Modeling
Software Engineer
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System Design
•
medium
Design a secure client portal for a financial institution that allows users to upload and process large CSV files (10GB+).
#Asynchronous Processing
#Cloud Storage
#AWS
#Security
Software Engineer
•
System Design
•
medium
Design a URL shortening service like TinyURL.
#Hashing
#Scalability
#Databases
Software Engineer
•
System Design
•
hard
Design the architecture for an e-commerce checkout and payment system.
#Microservices
#Distributed Transactions
#Message Queues
Difficulty Radar
Based on recent AI-sourced data.
Meet Your Interviewers
The "Standard" Interviewer
Senior EngineerFocuses on core competencies, system constraints, and clear communication.
SimulateUnwritten Rules
Think Out Loud
Always explain your thought process before writing code or drawing architecture.