It takes an expert to do an excellent job
In a modern application, the frontend completely determines the user experience. It goes without saying that nothing should go wrong there. Everything needs to be coded in such a way that the app works great and feels fantastic. Anytime and anywhere, on all devices, in any browser and on any platform. In addition, the code should be logical and well-organized, fit into the existing enterprise architecture and, furthermore, be of a level of quality that is easy to maintain and conforms to security and performance requirements.