Planning for the JLPT? Learn about the new JLPT test levels N1, N2, N3, N4, and N5. The JLPT is a goal for many students of the Japanese language - whether for university entrance, a job in Japan, or just personal motivation.
Even though it doesn't expire, I think a recently attained certificate would be better for getting a job, unless you've been living in Japan/using Japanese at work since earning the qualification.