Working on a
Front-End
1. Web fundamentals like HTML,
2. JavaScript, and CSS, JavaScript frameworks like AngularJS,
3. Front-end (CSS) frameworks like Foundation or Bootstrap
4. AJAX
Back-End
1. API design and development
2. CRUD (Create, Read, Update, Delete)
3. RESTful Services
4. Web fundamentals like HTML, JavaScript, and CSS
5. Database technologies like MySQL, Oracle, PostgreSQL, and MongoDB.
6. Web server technologies like Node.js, J2EE, Apache etc
7. Frameworks related to their server-side language of choice like: Express.js, Ruby on Rails etc.