Computer Operations in Starfleet

There is a lot that goes on aboard starships and starbases that we never see. There is no question that one of the most important systems in Starfleet is the computer - it runs all systems and yet we never meet the team who are in charge of maintaining it. Who is the master/mistress of the LCARS? The trio reviews the many computer malfunctions in Trek, and why the IT department was surely ignored by the command team. Who is the ultimate commander of the computer?