Considering the amount of tooling and or services on AWS that relies on Java this is a great fit. I wonder what kind of services he could help AWS create (a cloud service that would support J2EE and also be lower cost / integrated)?
Considering his recent advisory work related to Scala, there's a good chance he'll lead an effort to build new services in Scala. A guy like James is clearly passionate about language design, so I be he'll help shape the future of Scala as well, using input from his AWS experience.
Amazon is super Java oriented so the overwhelming majority of backend work will be in Java. I would just search Amazon.jobs for Clojure or Scala, since even within specific teams you might see a combination of OOP and FP.
