I suppose I'll put in from the perspective as a prospective interviewer. All other things being equal, I would likely look at certifications as an area that you've shown interest in. However, all things are rarely equal: I would worry more about your actual accredited degree from a reputable university or college (as may be applicable to your country - colleges here in Canada are usually not accredited degree-granting institutions, unlike in the U.S., and I know nothing about the U.K. system), and your in-field experience. Even if that in-field experience is open source. (In some ways, that's even better, since I can go and look at samples of your code, buglists, etc., before the interview - we can then go over your code with some really technical questions!) I want to know what you have done, and how that makes you a better candidate for the position I have to fill. Certification rarely answers that question.