Nanomech by R. David King
Approx. 101,910 words.
Published on September 5, 2012.
Aiben leads an uncertain life as a cybermancer acolyte and part-time starship mechanic. When the Zenzani Protectorate invades his homeworld, he learns that the molecule-sized machines augmenting his body and mind have a centuries-old plan for him. He must find an ancient weapon and a long-forgotten people that will bring his past crashing into his future and seal his destiny forever.