You only need the right attitude for this job (and 2-4 years’ commercial .NET experience). That’s it.
This company’s a bit behind in their tech roadmap, so they would like to hire someone that’s worked on some new tech and is keen to be the go-to person in the dev team.
It’s not about how much code you can write; it’s about writing code that’s easy to maintain. The company has plenty of money to further invest into the IT Department and, if you like the idea of a developer job working in t-shirt and jeans (maybe a hoodie in the winter), then you might want to find out more about this opportunity.