A Full Stack Web Developer is a professional who has the ability to work on both the front-end and back-end portions of web applications. They are skilled in a variety of programming languages and technologies, enabling them to handle tasks ranging from designing user interfaces to database management and server-side logic. The role requires a broad skill set and a deep understanding of how the web works.

Front-End Development

This involves everything the user sees and interacts with on a website or web application.

1. Languages: HTML, CSS, and JavaScript are foundational.
2. Frameworks and Libraries: Popular choices include React.js, Angular, and Vue.js.
3. Responsive Design: Proficiency with frameworks like Bootstrap or Material-UI to create designs that work on various devices.
4. Version Control/Git: Essential for tracking changes and collaborating with others.
5. Build Tools: Familiarity with Webpack, Gulp, or Parcel for optimizing and bundling assets.

Back-End Development

This encompasses the server-side logic, databases, and application integration.

1. Server-Side Languages: Proficiency in at least one language such as JavaScript (Node.js), Python, Ruby, PHP, C#, or Java.
2. Databases: Knowledge of both SQL (e.g., PostgreSQL, MySQL) and NoSQL (e.g., MongoDB) databases.
3. APIs (REST & GraphQL): Ability to create and consume web APIs.
4. Server Management: Understanding of how to configure and manage web servers like Apache, Nginx, or IIS.
5. Containerization and Orchestration: Tools like Docker and Kubernetes are increasingly important.

Full Stack Development

A blend of both front-end and back-end skills:

1. Architectural Understanding: Knowledge of how to structure the whole application, considering aspects like scalability, security, and cost.
2. DevOps: Understanding basic CI/CD principles, cloud services (AWS, Azure, GCP), and basic server maintenance and deployment strategies.
3. Testing: Writing tests for both front-end and back-end code. Familiarity with testing frameworks like Jest, Mocha, Jasmine, or Selenium.
4. Problem-Solving Skills: Ability to debug issues and find solutions across the entire stack.
5. Project Management: Understanding Agile methodologies, version control workflows, and task management tools like Jira or Trello.