Guided learning · feedback during practice

Improve your next answer, not just your score.

Practise with guidance, understand what to improve, and retry with a stronger approach.

Coach Interview — System Design · Answer one question at a time. Get immediate coaching, best practices, and retry before moving on — no hiring scorecard.

The coaching cycle

Answer

Speak your answer naturally — voice-first coaching.

Get coached

Immediate feedback, gaps, and best practices.

Retry or advance

Retry the same question or move on when ready.

Available coaching sessions

System Design Problems

Design a Blob Store

System Design

Medium

45 min

Design a URL Shortener (like bit.ly)

System Design

Medium

Improve your next answer, not just your score.

System Design Problems

Design a Blob Store

Design a URL Shortener (like bit.ly)

Improve your next answer, not just your score.

System Design Problems

Design a Blob Store

Design a URL Shortener (like bit.ly)

Design a Rate Limiter

Design a Globally Distributed E-Commerce Platform with Adaptive Scaling Architecture

Design a Real-Time Fraud Detection System for Credit Card Transactions

Design a Globally Distributed Payment Authorization System

Design a Fault-Tolerant Payment Processing System

Design a Hotel Search System

Design a Hotel Search System

Design Agoda's Coupon and Promotions Platform

Design a Multi-Region Active-Active Database for a Booking Service

Design Agoda's Coupon and Promotions Platform

Design a Microservices-Based Banking Platform

Design a Global E-Commerce Platform with Dynamic Scaling Strategy

Design a Microservices-Based Banking Platform

Design a Real-Time Hotel Room Inventory Management System

Design a Global Real-Time Collaborative Document Editing Platform

Design a Global URL Shortener at Scale

Design a Stock Trading System with Market and Limit Orders

Design a Multi-Region Active-Active Database for a Booking Service

Design a Multi-Tenant Database Schema for a SaaS Billing Platform

Exactly-Once Payment Processing Pipeline

Design Groww's SIP (Systematic Investment Plan) Backend

Design an Order Matching Engine for an Equity Exchange

Design a Real-Time Fraud Detection System for Credit Card Transactions

Design a Currency Exchange Rate Service

Design a Payment Gateway with Idempotency Guarantees

Design a Global Life Insurance Policy Processing System

Design a Rate Limiter for an Insurance Data API

Design a Distributed Cache

Design a Multi-Level Smart Parking Lot System

Design a REST API for a Smart Thermostat Device

Design a Real-Time Hotel Room Inventory Management System

Design a Catastrophe Model Output Processing & Storage System

Design a REST API for a Policy Management System

CAP Theorem Deep Dive: Designing a Globally Distributed Database

Design a Subscription Billing System

Design a High-Volume Invoice Generation System

Design a Distributed Hotel Checkout System Using the Saga Pattern

Design a Global Hotel Booking System with Real-Time Inventory

Design a Distributed Tracing System Across Microservices with Observability Platform Integration

Design a Real-Time Fraud Detection System

Design a Guaranteed-Delivery Notification System for Trade Confirmations

Design a Distributed Transaction System with ACID Guarantees Across Microservices

Design a Rate Limiter for Wells Fargo's Public-Facing APIs

Resolving Circular Dependencies Between Microservices

Design a Multi-Agent System for Automated Code Review and Bug Fixing

Design an Evaluation and Benchmarking Framework for Agentic AI Systems

Design an Enterprise LLM Agent Deployment Platform

Design a Fraud Detection Pipeline

Design a Pub-Sub Messaging System

Design a Distributed Cache

Design a Distributed Task Scheduler

Design a High-Throughput Sharded Counter System

Design Quora

Design Uber

Design YouTube

Design Instagram

Design Twitter News Feed

Design TikTok

Design Google Maps