/fʊl stæk dɪˈvɛləpə/
Full stack developer is a software developer who mastered a variety of skills and is able to use these skills to build a product independently. Typically that means they are skilled in both frontend and backend web development, while also working with databases, servers and clients.
An experienced full-stack developer is familiar with every layer of the tech stack. Tech stacks can be a web stack, mobile stack or a native application stack, depending on the project and clients’ needs.
The upside of being a full-stack developer in general is having an extensive skill set which can simultaneously be thought of as a disadvantage because they do not specialize in just one area of development. However, most developers do have a favorite programming language that they have mastered overtime.