Shards of Earth by Adrian Tchaikovsky

Idris has neither aged nor slept since they remade him in the war. And one of humanity’s heroes now scrapes by on a freelance salvage vessel, to avoid the attention of greater powers. After earth was destroyed, mankind created a fighting elite to save their species, enhanced humans such as Idris. In the silence of space they could communicate, mind-to-mind, with the enemy. Then their alien aggressors, the Architects, simply disappeared—and Idris and his kind became obsolete. Now, fifty years later, Idris and his… Read more.