The following are responsibilities of a Full Stack Developer:
Developing front end website architecture.
Designing user interactions on web pages.
Developing back end website applications.
Creating servers and databases for functionality.
Ensuring cross-platform optimization for mobile phones.
Ensuring responsiveness of applications.
Working alongside graphic designers for web design features.
Assisting and seeing a project from conception to finished product.
Designing and developing APIs.
Meeting both technical and consumer needs.
Staying abreast of developments in web applications.
If you want to become a full stack developer, check out this Full stack Developer Course by Intellipaat.