Prepare for .NET System Design interviews with 40 real-world senior .NET interview scenarios covering scalable APIs, architecture, data, caching, messaging, resilience, security, observability and production system design.
The guide covers scalable ASP.NET Core APIs, multi-tenant applications, order and payment systems, SQL vs NoSQL, high-volume databases, database contention, data consistency, distributed caching, background processing, message handling, event-driven communication, synchronous vs asynchronous communication, downstream failures, API latency, horizontal scaling, rate limiting and graceful degradation.
It also covers authentication and authorization, service-to-service security, safe resource access, idempotent APIs, disaster recovery, observability, production incident troubleshooting, correlation IDs, health checks, safe deployments, large-file uploads, notification services, search, scheduled jobs, audit logging, reporting APIs, URL shortening, real-time notifications and API gateway/BFF design.
Each scenario follows a practical format: Question → HOW TO APPROACH → SENIOR-LEVEL FOCUS
helping you structure your answer, explain trade-offs, identify modes and discuss production validation.
