Star Vigilante

Matt Dragoneaux is an interstellar hired gun who follows the Code of the Vigilante: track ‘em, strike ‘em, and be elsewhere when the Anarchate battleglobe shows up. And with the aid of the self-aware starship Mata Hari, he's been successful in bringing a small bit of justice to the alien star culture of the Anarchate. But then a crossbreed woman hires him to right a wrong being done to her planet by an alien commercial conglomerate that rules whole star clusters. Matt, aided by cyborg improvements that make him a deadly foe, sets out to do his job the best he can. Soon, he is on track to becoming the deadliest Vigilante in human history. But humanity's survival among the crowded stars might be the price for success in his job.