Some people make the argument that Java is better for the backend, but in my experience, Node.js can be just as performant than Java on the server-side, especially since a Java server uses 2MB of RAM just to create a thread. You could have hundreds of thousands of threads if your website is popular or users are doing a lot at the same time, and those 2MB of RAM per thread can quickly add up. Node.js is superior when it comes to delegation, as it is able to handle tons of requests on a single thread. Since Node.js is a single-threaded server, RAM usage isn’t nearly so much of a concern.
The classic way in which machine learning developers make their models available is by having them run on a server and allow requests and share results via an API. There are several situations, however, where it is advantageous to run the model on the end user’s device. For example, the model that recognizes the faces of your contacts in the photos that are stored in your phone could be run locally on your device, so your photos remain private and never leave your device.
A web app developer is “a software designer or engineer who is involved in the development and design of web and/or network applications,” according to InfoSec Institute. This role involves more devops responsibilities than a pure frontend web developer and includes developing and managing software packages and installation programs for websites. You can also be expected to improve performance and improve SEO. A web app developer is paid similarly to a frontend web developer. The average base salary in the US is $75K, and more senior positions can earn more towards $100K+.
A UI/UX designer is responsible for designing the user faces of a website or application. They focus on the user experience and consider how things look as well as how easily users will understand the interface. A UI designer would decide how the frontend that a frontend or web app developer would implement. They are also responsible for understanding the priorities of the customer and integrating those into the experience. To understand the difference between UI and UX design, check out this explanation from Celarity. A UI/UX designer earns on average $96K and those at the top of the career ladder earn around $150K.