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Security System Design Case Studies

InterviewSkool tracks 32 Security case studies with architecture diagrams, scale estimates, and deep dives.

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Topics

Distributed Systems 90Real-time 51Storage 43Data Pipelines 42API Design 41Databases 38Caching 37Security 32AI / ML 23Algorithms 20Scheduling 20Search 19Event Driven 14Fintech 14Payments 11Geospatial 11Analytics 11Observability 11E-commerce 11Messaging 10CDN 9Concurrency 8Ads 8Frontend 8Booking System 6Networking 5IoT 4Media 3Media Streaming 3Collaboration 3Rate Limiting 2
SecurityClear all
Coupon Distribution System
7 min readDistributed SystemsSecurityEvent Driven
Advanced—▶ Mock
Access Control System (RBAC + Resource Permissions)
6 min readSecurityDatabasesAPI Design
Intermediate▶ Mock
Reviewing an Existing Architecture for Risks
6 min readDistributed SystemsSecurityObservability
Intermediate▶ Mock
Multi-Tenant Audit Logs Service
4 min readSecurityStorageData Pipelines
Intermediate▶ Mock
Cloud Development Environment (Codespaces / Replit / DevBox)
7 min readDistributed SystemsSecurityScheduling
Advanced▶ Mock
Content Moderation System (Harmful Post Detection)
6 min readAI / MLSecurityData Pipelines
Advanced▶ Mock
Credit Card Authorization, Limits and Reporting
4 min readFintechPaymentsReal-time
Advanced▶ Mock
Credit Card Customer Portal
5 min readFintechSecurityAPI Design
Beginner▶ Mock
Enterprise AI Agent for a Global Company
5 min readAI / MLSecurityDistributed Systems
Advanced▶ Mock
Entitlement-Aware Agentic Workflow for Portfolio Requests
4 min readAI / MLFintechSecurity
Advanced▶ Mock
First-Time Kubernetes Deployment in a New Cloud
4 min readDistributed SystemsSecurityNetworking
Intermediate▶ Mock
Governed Data Service for Downstream Consumers
3 min readAPI DesignData PipelinesSecurity
Intermediate▶ Mock
High-Volume Healthcare Data Ingestion Pipeline
4 min readData PipelinesSecurityStorage
Advanced▶ Mock
Hosting Many Websites on One Server with One IP Address
4 min readNetworkingSecurityDistributed Systems
Beginner▶ Mock
Automated Jira-Ticket-to-Pull-Request System
4 min readAI / MLSchedulingDistributed Systems
Advanced▶ Mock
Large File Upload and Processing Pipeline
7 min readStorageData PipelinesSecurity
Intermediate▶ Mock
Guardrails and Fallbacks for Reliable LLM Systems
4 min readAI / MLSecurityDistributed Systems
Intermediate▶ Mock
Malicious IP and URL Detection Service
5 min readSecurityReal-timeCaching
Advanced▶ Mock
Mobile Banking App Backend
3 min readFintechSecurityPayments
Intermediate▶ Mock
Multi-Tenant Data Ingestion and Processing Platform
4 min readData PipelinesDistributed SystemsSecurity
Advanced▶ Mock
Multi-Vendor Integration Platform (Connectors for Email, Slack, CRMs)
4 min readAPI DesignSecurityEvent Driven
Intermediate▶ Mock
Multimodal RAG Assistant over an Internal Knowledge Base
4 min readAI / MLSearchData Pipelines
Advanced▶ Mock
Offline Multi-Device E-Book Reader (Kindle-style)
3 min readStorageAPI DesignCollaboration
Intermediate▶ Mock
Online Judge and Coding Contest Platform (LeetCode)
6 min readDistributed SystemsSecurityScheduling
Intermediate▶ Mock
Post Privacy and Visibility System (Facebook-style)
4 min readSecurityDistributed SystemsCaching
Advanced▶ Mock
Prompt Sharing Platform
5 min readAI / MLSecurityDatabases
Intermediate▶ Mock
Enterprise Remote Browser Isolation System
3 min readSecurityDistributed SystemsScheduling
Advanced▶ Mock
Secure Multi-Tenant API for an Enterprise AI Copilot
4 min readAI / MLSecurityAPI Design
Advanced▶ Mock
Secure Internal Web App for Sensitive Financial Data
4 min readSecurityAPI DesignDatabases
Intermediate▶ Mock
Security Monitoring Framework for Cloud Infrastructure
4 min readSecurityObservabilityData Pipelines
Advanced▶ Mock
Virtual Credit Card Service (Capital One)
6 min readFintechPaymentsSecurity
Intermediate▶ Mock
Voting System APIs and Data Model
3 min readAPI DesignDatabasesSecurity
Beginner▶ Mock

Frequently Asked Questions

What is Security in system design?

Security is a core system design topic covered in 32 case studies on InterviewSkool. It appears frequently in FAANG interviews, especially at Google, Amazon, and Meta.

How should I prepare Security for system design interviews?

Study the case studies above, focusing on architecture trade-offs, scale estimates, and API designs. Practice explaining your decisions aloud — this is exactly what interviewers evaluate.

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