C# and .NET are one of the long-lived backbones of enterprise software. Across more than twenty years of development experience I have built products on different versions, from the .NET Framework era to ASP.NET Core; I know where this platform is strong and where it is needlessly heavy for systems with dense business rules, many integrations and years of maintenance ahead.
.NET is a platform that runs multiple languages, primarily C#; ASP.NET Core is the standard way to build web applications, APIs and services on that platform. A .NET expert doesn't only write code: they plan how business rules will be split into layers, where database access happens, how authentication is set up and how the system will grow over the years.
.NET is a strong choice for enterprise applications that need dense business rules, strong type safety and long-term maintenance. Integration cost especially drops if your existing ecosystem talks to Windows, Active Directory, SQL Server or enterprise ERP systems. On the other hand, it may not always be the shortest path for a small, single-purpose website or a very fast prototype; I choose technology by need, not habit.
ASP.NET Core also runs on Linux. So choosing .NET does not automatically mean staying tied to a Windows server; we decide the deployment environment together based on cost, team knowledge and operational requirements.
Many organisations have Web Forms, old MVC or WCF applications that work but no longer have a developer. Rewriting them overnight is usually not the right answer. First we extract the dependencies and the flows that are actually used, then set up a gradual migration plan:
This approach removes the risk of a big "rewrite" project going a whole year without delivering anything.
On the .NET side, performance is often looked for in the wrong place. The real difference shows in the number of database queries, unnecessary object creation, incorrect async usage and the caching strategy. I measure first: slow queries, memory pressure and external service latency. Then I apply targeted improvements.
On the security side, defaults matter: least privilege, not keeping secret keys in source code, input validation, secure session management, audit logs and regular dependency updates. Sensitive surfaces such as admin panels are protected with separate access rules where possible.
Enterprise applications don't live alone. Integration with ERP, accounting, e-commerce, payment and messaging systems is usually the most critical part of the work. On the ASP.NET Core side I separate internal and external APIs and design retry, queue and idempotency concerns from the start. That way the whole system doesn't stop when one service slows down.
Code being understandable is necessary not just for it to work today but so someone else can take it over tomorrow. I leave a readable structure, testable business rules, short architecture documentation and a meaningful commit history. Maintenance and new feature development after delivery can continue optionally.
If the application works and security support continues, it may not be an urgent necessity. But older versions are reaching end of support, and new packages and security patches stop coming. The migration decision should be made by evaluating risk, cost and the application's lifetime together.
For new projects, ASP.NET Core is the default choice. It is faster, can run on Linux and receives long-term support. Legacy MVC or Web Forms continue only in parts of the existing system that must be preserved.
Yes, when used correctly. But N+1 queries, unnecessary tracking and pulling large amounts of data cause serious slowdowns. In critical queries I use projections, AsNoTracking or controlled raw SQL.
Yes. ASP.NET Core is used in production on Linux containers and servers. The choice is made entirely according to your operations team's habits, cost and existing infrastructure.
Yes. I can provide architecture review, code review, performance troubleshooting and technical leadership support. The goal is not to replace the team but to make decisions more solid and sustainable.
Scope, number of integrations and the state of the existing system determine it. A small API or internal application can be delivered in a few weeks; with enterprise integrations the time grows. A precise plan is given after the discovery phase.
