1. Expert understanding of code structure, plugins and architecture.
2. Custom theme implementation.
3. Plugin development & customization.
4. Custom shipping & payment module.
5. Good understanding of Design pattern, Dot net core and 3rd party APIs.°6. MVC, Linq, SQL, Oops, C#, Entity framework
7. Thorough knowledge of version controll(svn/git)
8. Umbraco, Kentico CMS (if knows then advantage)
9. Good written skills.°