Henry Gallant and the Great Ship (The Henry Gallant Saga Book 7) Amazon

 The people of Earth are going to the stars to create a galactic empire, but two mighty alien species are poised to stop them. The ancient Chameleon race and the genocidal Titans have found common ground. Their alien credo is . . .

All humans must die.

The Chameleon were humanoid but had an AI chip implanted in their brain, which gave them unique abilities. Henry Gallant's exceptional ability to interface with AI made him the key to understand their technology.

For Fans of Gattaca and Horatio Hornblower.