how to be a better programmer

I am a programmer with over 3 years experience in writing java and .net applications.

However I need some better tactics for spotting bugs. I can catch most of them but after a while I get tunnel vision and miss some. I have a tendency to think if code works and is robust then a minor bug isnt an issue. However i have worked with senior devs that seem to not think like this. Despite the fact that they write bugs all the time, but when they do it, its jenky, not a bug.

I can write test cases and catch the majority of things, but its the edge cases i miss or if a senior dev thinks one thing should be tweaked that was not in the specs at all and is not consistent with the entire application. I constantly get implementation advice and this leads me down the wrong path nearly all the time.

I have most worked with senior devs that do next to nothing but review code all day. Technically they are not even close to me, but they spot a bug and think they wrote the code.