PSJD (the NALP website for public service careers) includes:
UW Law students and alumni can set up accounts in PSJD.
Family Liaison Office, U.S. Dep't of State, Resources for Lawyers Going Overseas (Spring 2017). Includes links to other resources.
International Law Students Association, Jobs and Internships: "links to international tribunals, intergovernmental organizations, government agencies, and nongovernmental organizations where students and recent law school graduates may find internships or employment."
Ed Finkel, International Intrigue: Overseas Opportunities Abound for Those Willing to Stomach the Risks, Student Lawyer, Jan. 2015, at 20, HeinOnline
Mark E. Wojcik, Working Internationally, Student Lawyer, Jan. 2008, at 19, HeinOnline
PSJD resources include