Developing and maintaining web applications, from front-end user interfaces to back-end server-side logic. This includes understanding customer requirements, designing and implementing technical solutions, and testing and deploying web applications. They must have proficiency in multiple programming languages, such as HTML, CSS, JavaScript, PHP, and database management systems such as MySQL and MongoDB. A full-stack web developer should also have knowledge of web development frameworks, APIs, and web architecture principles. Additionally, they should be familiar with project management methodologies and be able to collaborate effectively with other members of a development team.