I did not choose React and .NET as a long-term strategy from the beginning. I ended up using them across different projects, and over time it became clear why the combination worked well for me. It fits the type of applications I tend to build, especially ones that grow in complexity over time.
What works well
React gives a lot of flexibility on the frontend and makes it easy to iterate quickly. On the backend, .NET provides structure and consistency, which helps keep things predictable as the system grows. Together, they create a balance where the UI can move fast without turning the backend into something unstable.
Where things usually go wrong
The main issues I have seen are not related to the technologies themselves, but to how they are used. Problems start when boundaries between frontend and backend are not respected. Logic begins to spread across layers, and responsibilities become unclear. That is when the system starts getting harder to maintain.
What I try to avoid
I try to keep a clear separation between concerns. The backend should not be aware of UI details, and the frontend should not depend on how the data is stored. Keeping this separation makes it easier to change either side without causing issues in the other.
What improved things over time
Focusing on API design helped a lot, especially treating it as a stable contract instead of something that changes based on frontend needs. Keeping domain logic isolated in the backend and limiting complexity in the frontend also made the system easier to work with. Avoiding unnecessary architectural decisions early on, like splitting into multiple services too soon, also prevented a lot of overhead.
Where this stack fits best
This setup works well for applications that are expected to evolve over time, such as SaaS platforms or dashboard-heavy systems. It is less about the stack being special and more about how well it supports long-term iteration.
Final thought
I do not see React and .NET as the best stack in general. It is just the one that has consistently worked well for me when systems start becoming more complex.
