Whether due to transmigration, falling to ruin, being sold off, slavery, a disguised identity, wanting to change the future, or just needing a source of income, the female lead works as a maid. (Fair warning, this setting often means that power dynamics are not skewed in the FL's favour, which can sometimes lead to uncomfortable situations.)
Criteria to meet the list:
The FL must don the uniform of a maid when working.
The FL must have little to no social or political backing.
The FL must remain a maid for long enough that it becomes a part of her identity.
Sorted by alphabetical order. Official takes priority over fan translations when available.