A Full Stack Developer is a professional who has expertise in both front-end and back-end web development. They work on all aspects of web development, from designing and implementing user interfaces to developing server-side applications and databases.

Here are some of the responsibilities of a Full Stack Developer:

1. Developing user-friendly web applications that meet business requirements and user needs.

2. Creating and maintaining web applications using programming languages such as HTML, CSS, JavaScript, Python, Ruby, Java, and others.

3. Designing and developing user interfaces that are intuitive and responsive, using frameworks such as React, Angular, and Vue.

4. Developing server-side applications using technologies such as Node.js, PHP, Ruby on Rails, and others.

5. Integrating databases into web applications and developing APIs to connect with other systems.

6. Performing testing and debugging to ensure that web applications are error-free and meet quality standards.

7. Collaborating with other developers, designers, and stakeholders to ensure that web applications meet project requirements and are delivered on time and within budget.

8. Staying up-to-date with the latest web development technologies, frameworks, and best practices.
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In short, a Full Stack Developer has a broad set of skills and expertise in all aspects of web development. They are responsible for developing web applications from start to finish and ensuring that they meet business requirements, user needs, and quality standards.