Unix System Administration
The most important language for any developer to be fluent in is English. I also believe that anyone can write code that computers can understand; whereas, it's hard to find people that can write code for other humans to understand. At least some time in the future will be spent on reviewing or performing maintenance tasks on the code that I write, so it is my genuine desire to ensure it is professional and readable so your time in the future is not wasted.
When I work, I like to have a quick turnaround in communication to ensure the