As indicated on the Wikipedia , the Web engineering…

…actively promotes systematic, disciplined and quantifiable approaches towards successful development of high-quality, ubiquitously usable Web-based systems and applications [1,2].

In particular, Web engineering focuses on the methodologies, techniques and tools that are the foundation of Web application development and which support their design, development, evolution, and evaluation.

Web application development has certain characteristics that make it different from traditional software, information system, or computer application development.

Web engineering is multidisciplinary and encompasses contributions from diverse areas: systems analysis and design, software engineering, hypermedia/hypertext engineering, requirements engineering, human-computer interaction, user interface, information engineering, information indexing and retrieval, testing, modelling and simulation, project management, and graphic design and presentation.

In our case we use the following web engineering technologies:

PHP, Pear, Smarty

AJAX: Prototype

MySQL , Postgres

PHPUnit, Selenium, CVS, Software design patterns  

Symfony

Java

You can find more information in the technology section .