[dclara]

I think backend freelancing is harder than front end which needs some graphics design skills and HTML/css/javascript implementation. Most of the in-house systems are outsourced to contract/consultant companies instead of using freelancing due to the amount of work and time constraint.

With two years of experience, I guess it's too early unless you have intensive experience with many backend systems. Different companies may require different tool set and server stack. So it's hard to cover everything.

I've got a list of questions asked in my Kickstarter project: "How to build a website like an engineer", which may partially qualify you as a competent engineer in the job market. If you think you are over qualified to cover all the topics I provided, maybe it's a good to go. http://kck.st/SY4CXv