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Explanation: This might work. The problem is that the concept of doing oposiciones to become a funcionario doesn't really exist in Britain (don't know about the States).
tenure = guaranteed permanent employment in a job (esp. as a lecturer or teacher) after a probationary period.
tenure track (chiefly N. Amer,) an employment structure whereby the holder of a (usually academic) post is guaranteed consideration for eventual tenure, usually within a specified period.
tenured (of a post, esp. in a university or school) carrying a guarantee of permanent employment until retirement; (of a teacher, lecturer, etc.) having guaranteed tenure of office
(all from New Shorter Oxford)
funcionarios of any kind certainly do have guaranteed employment until they retire, which is why so many people spend years doing the exams to try to get a post.