Posts and interview questions tagged RAG.
Deep-dive into Retrieval-Augmented Generation: the dual problem (LLMs do not know your enterprise data + you cannot send confidential data to public APIs), full architecture, ingestion + retrieval + generation pipelines in C# with Azure OpenAI and the new Azure SQL VECTOR type, real code, security, costs, hallucination prevention, and the pitfalls that ruin production RAG systems.
Deep-dive into Clean Architecture for .NET: the Dependency Rule, the four layers, full project structure with EF Core + ASP.NET Core + MediatR, real C# code, advantages, trade-offs, and the pragmatic version that actually ships.
Deep-dive into CQRS in .NET: the problem it solves, architecture diagram, full C# implementation with MediatR, EF Core, separate read/write models, when CQRS pays off vs when it's over-engineering. With real code.
Deep-dive into Azure Functions: when to choose them over Web API, hosting plans, triggers and bindings, real .NET code (HTTP, Queue, Timer, Durable Functions), cold starts, cost model, advantages and disadvantages.
Deep-dive into the SAGA pattern: why distributed transactions need it, Choreography vs Orchestration, an order processing walkthrough with code, compensating transactions, real .NET examples, advantages, disadvantages, and production pitfalls.
Deep-dive into the Outbox pattern: the dual-write problem it solves, architecture diagram, real .NET code with EF Core, the relay/dispatcher implementation, CDC vs polling variants, advantages, disadvantages, and production pitfalls.
Deep-dive into ASP.NET MVC: what it is, why it exists, architecture diagram, real code, advantages, disadvantages, and where it fits in 2026. Basic to advanced.
Deep-dive into ASP.NET Web API: REST principles, architecture diagram, real controller and minimal-API code, versioning, auth, advantages and disadvantages. Basic to advanced.
Deep-dive into microservices: what they are, when to choose them, the trade-offs, architecture diagram, real .NET code, communication patterns, observability, and where they fail. Basic to advanced.
Records, pattern matching, ref struct, ValueTask, and primary constructors — how they change production code in 2026.
Inheritance chains break the Liskov Substitution Principle in practice. Here is how to refactor a 3-level hierarchy into composable behaviour with C# interfaces and DI.
Minimal APIs are not just for tiny services. Here is the production trade-off matrix and how to scale them without losing structure.