They are responsible for both the backend and frontend of web development. As such, the best Full Stack Engineers will have a solid grasp on multiple programming languages and databases such as PHP, CSS, HTML, JavaScript, SQL and more. A Full Stack Engineer will utilize all of these to create the overall architecture of any given web-based application and maintain a high-end product.Full Stack Engineer will also need strong skills when it comes to debugging and updating software, as well as maintaining code integrity while still keeping on task and within budget