How much do grades matter for a future academia position? I am completing my PhD and I was wondering how much does the PhD coursework grades affect future academia applications? My undergraduate and master's was somewhat decent grade wise (3.8/4) in both. However, I had taken two mandatory courses during my PhD and I got B+ and A- in them. It was not because of the difficulty in the coursework, but I was burned out with courseworks from master's and did not put any effort. My GPA turned out to be 3.56. I did not take any other coursework as my qualifiers committee found my theoretical knowledge adequate for continuing with my PhD.

Back of my mind, I am concerned that this will affect my postdoc and subsequent professorship applications. 

Is there any academic out there in same boat as me but have made it successfully in the professional world?
In the US, at least, and in most fields, no one will look at your grades or care much about them. If they were good enough for your institution to give you a doctorate, they will be good enough for everyone. 

I'm not sure this is universal, and would love to hear of exceptions. Such exceptions might occur in situations that have rigid regulations. Of course, if you are specifically hired to do X and you got terrible grades in X as a student, people might have some problems that need answers.