Since you're focused on blogging and not about managing your blog I suggest you go for self hosted WordPress. Find a clean fast loading theme and you're good to

Since you're focused on blogging and not about managing your blog I suggest you go for self hosted WordPress. Find a clean fast loading theme and you're good to go. Then add some nice articles showcasing your expertise. Add an about me section, preferably in top of the sidebar so it's visible to anyone. This is a great place to summarize your technical skills. If you want to engage with fellow Ruby developers then I suggest you join a community. When it comes to visibility a Google+ community is a good place to join. Your site can attract better job opportunities if you write enough and provide value. But you'll have a better chance with a good LinkedIn profile. I know few job hunters and they almost always look in LinkedIn first. Good Luck :-).