There are 3 books in the Janitors of the Post-Apocalypse series. The newest book is Terminal Peace which came out in 2022.

1
Terminal Alliance

Book cover of Terminal Alliance
The Krakau came to invite Earth into an alliance of sentient species, only to find that plague had turned humanity into shambling, near-unstoppable animals. A century later a bioweapon wipes out the Krakau command crew and reverts the rest of the humans to their feral state - only Marion 'Mops'…
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2
Terminal Uprising

Book cover of Terminal Uprising
Hugo award-winning author Hines returns to science fiction with the second book of the Janitors of the Post-Apocalypse, featuring the unlikely heroes that may just save the galaxy from a zombie plague.

Human civilization didn't just fall. It was pushed.

The Krakau came to Earth in the year 2104. By…

3
Terminal Peace

Book cover of Terminal Peace
Mops and her team were trained to clean spaceships. They were absolutely not trained to fight an interplanetary war with the xenocidal Prodryans or to make first contact with the Jynx, a race who might not be as primitive as they seem. The survival of humanity - those few who…