Amy Porges points me to more details on the WTO hiring in dispute settlement:
Vacancy Notice No.: EXT/T/12-07
Title: Dispute Settlement Lawyer
Grade: To be confirmed
Contract Type: Temporary appointment
Issued On: 14 November 2012
Original published date: 14 November 2012
(42 day(s) until closing date)
Republished (Currently accepting applications)
Application Deadline (CET): 31 January 2013
Division: Legal Affairs, Rules
Duration: Maximum of two years, non-extendable
The Secretariat of the WTO is seeking to fill potential multiple positions of Dispute Settlement Lawyer to work in the Rules Division or Legal Affairs Division. The salary will be determined based on experience and qualifications.
1. Deliver substantive legal advice and assistance to WTO panellists and assist other Secretariat lawyers working with dispute settlement panels. More experienced dispute settlement lawyers may serve as team leader or co-leader in disputes and supervise the work of other lawyers, paralegals and support staff.
2. Conduct research on legal issues including case law, prepare analyses of factual and legal issues in the context of disputes, and prepare legal opinions. More experienced dispute settlement lawyers will be assigned more complex legal issues and may direct or guide the research and/or analyses of legal issues conducted by more junior staff. Day to day supervision of junior lawyers and other staff may be required.
Note that it's a short-term appointment -- two years max. But of course, you'd have the opportunity to get to know people and impress them, which could lead to something more.