I'm not a programmer by trade, but I can relate. I'm the first chair French Horn at my school, and have the ultimate responsibility for my section playing right

I'm not a programmer by trade, but I can relate. I'm the first chair French Horn at my school, and have the ultimate responsibility for my section playing right, sounding good, and blending in. However, I frequently find myself asking my peers what the fingering of a note is that I've played just fine hundreds of times before. Does that make me a bad player? No, it just means that it takes me longer to master things, and that I have to practice a lot more to maintain proficiency. Should I give up? Heavens, no- I didn't come this far just to quit because I keep messing up my damn B flats. Should you quit your job? Absolutely not. It's almost like you're human and that your brain slowly removes things over time to make way for new information. How are you doing physically and mentally? I've found that doing sports (getting out and jogging, doing yoga, etc.) or something physical really helps me stay focused and positive, and that going to bed at a sane hour is more important for me than getting extra work done- because if I stay up late, I'll be tired and sub-optimal for the next two or three days. If you're the slowest and worst coder at your firm, then there's probably at least somebody who's knowledgeable enough and willing enough to help you out and talk to you. Find them, and when you ask for advice, write it down somewhere so that you don't have to go back asking the same thing. If you can, befriend them, though that will take time. You didn't come this far just to quit. You can do this.