After looking and talking to a good number of plumbers I finally found Jimmy Joe per high recommendations from Ahwatukee 411 forum. I needed to have the entire plumbing configured and a bigger disposal unit installed after I replaced a single drain under-mount kitchen sink with a double drain. Jimmy Joe re-configured the drain lines, installed new faucets and disposal and reattached the R/O unit, and some other minor work.
The only issue I encountered was that we had a flooding in the kitchen during that night which caused some minor damage to baseboards, due to what it seemed to be couple defective parts connecting the R/O unit. I called Jimmy Joe and he came first thing the next day and replaced all those parts with more secure parts at no cost. Overall satisfied with the work.