Is there any risk in this job?

There isn't any major risk, as long as you're working for a legitimate company. Of course, any job where you're working in an office or among people has the 'risk' of encountering people you might not get along with. Sedentary work is also not particularly healthy, but as long as you get adequate exercise outside of work (and ideally, take breaks to walk around once in a while), you should be fine. Also, be sure to take the right precautions for your eyes when doing a job that involves looking at a computer screen a lot: How to Avoid Eye Strain While Working at a Computer.