# 5 Lessons I Learned Building Scalable .NET Backend Systems

Building backend systems that are both scalable and maintainable is not about using every modern pattern available. It is about making the right trade-offs at the right time. Over the years, I have worked with .NET, ASP.NET Core, SQL Server, Redis, EF Core, and architectural patterns like Clean Architecture, CQRS, DDD, and Modular Monoliths. One thing became very clear: good backend engineering is mostly about clarity, restraint, and performance in the right places. Here are five lessons that sh