Build And Modernize Business Systems On .NET

Not urgently, but the direction of travel is clear: new features, performance work and library support are all happening on modern .NET. The practical answer is to move the parts that benefit, usually anything you are actively changing or that needs to run in a container, and leave stable components where they are until there is a reason. A migration without a deadline that keeps making progress is still better than a rewrite that fails.

No, and that assumption is a decade out of date. Modern .NET runs on Linux and in containers, deploys to any major cloud, and works comfortably with PostgreSQL, Redis, Kafka and the rest of the usual infrastructure. Plenty of .NET applications run entirely outside Azure. The tooling is strongest in a Microsoft environment, but nothing forces you into one.

Rarely as a whole-application decision, and often as a component one. F# is a strong fit for domains that are mostly transformation and calculation, such as pricing, financial modelling or data processing, where making invalid states impossible to represent pays off immediately. C# remains the sensible default for most application work, not least because hiring for it is far easier.

Blazor is compelling when your team is strongest in C# and the application is internal or line-of-business, because one language across the stack genuinely reduces friction. A JavaScript framework is usually the better answer for public-facing sites where initial load matters, where you need the wider ecosystem of components, or where you will need to hire frontend specialists. Both are real options, and the deciding factor is your team more often than the technology.

Usually a small number of specific causes rather than the ORM being the wrong choice. Lazy loading turning one query into hundreds, change tracking left on for read-only queries, projections pulling whole entities when a few columns would do, and missing indexes underneath. The fix is to look at the SQL actually being generated, correct those patterns, and drop to raw SQL for the handful of paths where the ORM genuinely is not the right tool.

Yes, and it is usually the only version that finishes. The approach is to put a boundary around the existing system, move functionality out piece by piece behind that boundary, and route traffic to the new implementation as each piece proves itself. The old system shrinks rather than being switched off, and you keep shipping the whole time. It is slower on paper and considerably more likely to succeed.

No. Azure is a good fit when you are already invested in the Microsoft ecosystem and want managed services that assume .NET, but the platform runs anywhere containers run. We work with whatever you have, and if a move is worth recommending it will be for a reason we can show you rather than because it is the default answer.

For internal tools, forms-heavy applications and anything where the same team maintains both platforms, yes, and the shared codebase is a genuine saving. For consumer applications that lean on platform-specific behaviour, heavy graphics or the newest device features, native still wins. The honest test is how much of your application is unique to each platform: if the answer is a lot, cross-platform is buying you less than it appears to.

Yes. Our developers work in your repository and your review process rather than in parallel and delivering a surprise. That matters more on .NET estates than most, because the context that makes these systems safe to change tends to live in people's heads rather than in documentation.