It's probably not much of an improvement but I am adding to the suggestions:
I have worked for over four years in software development with web applications and enterprise servers. I have substantial experience in Javascript (background and ember frameworks).

I specialize at writing complex enterprise applications across a variety of networks where reliability and security are crucial. I have also written software in Python (Django) and PHP (Symfony). I ensure that code is well-documented, maintainable and try to use Revison Control Systems (Git, SVN, CVS) whenever possible.

I also suggest to be more specific in what you have used and include any reference.