Read in : The Best Science Fiction of the Year: Volume Three. (ed Neil Clarke, Nightshade Books 2018)
Online : more details
Humanity is facing desperate times, and our last hope, a spaceship out there protecting Earth is compromised, just as the alien force is about to arrive and annihilate us. The human crew are unable to come up with a plan, but fortunately one tiny little repair bot (and I do mean tiny) amongst tens of thousands on the ship, has other ideas.
A cute little story.