At the top of the maids is Sebas, he is the head butler of the regular maids and the substitute leader of the Pleiades. He is generally in charge of everything that has to do with the management of the 41 maids. Under sebas is Pestonya (The head maid) who helps him manage the maids and Eclair (The Assistant Head Butler) who is in charge of cleaning. I think he also helps manage the maids but the maids dont respect him very much.
On the other side are the Battle maids, there are 7 of them
Aureole Omega
Yuri Alpha
Cz2128 Delta
Entoma Vasilissa Zeta
Sulution Epsilon
Narberal Gamma
And Lupisregina Beta
The leader of the Battle Maids is Aureole, she is in charge when they are in the 7 sisters system but usually she is on the 8th floor acting as an area guardian.
When aureole isnt there Yuri is in charge.
The Maid / Butler Chain of command goes as follows
Sebas
Aureole
Yuri
The other 5 Pleiades
Eclair
Pestonya
The 41 regular maids
The Maid System is lead by sebas and is completely seperate from the guardians system, as such a maid would have to follow the orders of sebas over the orders of, lets say Aura but unless he says otherwise they would still listen to Aura’s orders.
Next is the Guardians System. At the top would be Albedo she is the overseer of the guardians, which by extension makes her the overseer of nazarick, she is technically the person with the most authority save for ainz himself. Under albedo is Demiurge, he serves as Albedo’s right hand man and takes care of the military aspect of nazarick's management because he’s better at it than she is. Under Demiurge are the other floor guardians, they have complete authority over everyone on the floor that they guard. Technically Shalltear would be the floor guardian with the most authority since she guards the most floors but the floors that she guards are the smallest so idk.
Under the floor guardians are the area guardians, these are just guardians that guard a particular spot on the floor rather than the entire floor itself.
The chain of command for the guardians goes as follows.
Albedo (Overseer)
Demiurge (7th floor)
The Guardians of floors 1-3, 5, 6 and 8
The Area Guardians