I have ADHD (diagnosed from childhood, retested multiple times since). I do DevOps/SRE type stuff. Used to do dev as work, and found it didn't work well with my condition. moved to sysadmin, and then DevOps/SRE type roles and it is much better for me. I have Ritalin, by prescription. It helps with the precision, boring, routine stuff. I do not take it when I need to grok a whole system in my head, or do creative problem solving.

As others have recommended, repetitive music helps. The prodigy, Infected Mushroom, cowgirl, combichrist, etc are all on my work playlists.

I found keto really helped a lot for me to get sustained focus, YMMV.

If you do get flow, ride it.