First Orbit by Nathan A Thompson

He's trapped in a ruined starship full of monsters. But every section he fixes will help him turn the tide.

Jasper Cloud has been torn from a dystopian Earth and thrust into a mighty but ruined alien starship, where deranged and mutated creatures haunt the darkened corridors. They've consumed all but one crewmember: the being serving as the ship's core, a young woman as badly damaged as the starship itself.
They both should be as doomed as Jasper was back on Earth, but for one surprise: Jasper has the power to help repair the damaged sections of the mighty vessel.
And every section he repairs also augments his own body.
If he is quiet and careful, he can turn himself into a weapon capable of defeating the hungry horrors still prowling the ship's halls, and reactivate the most powerful spacecraft left in the universe.
But if he fails, then the creatures will have a vessel of their own to visit and devour every populated planet left-Earth included.

Cradle meets Dead Space.

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