december 1,
to whom it may concern,
this is to certify that mr.(ms.) has been working in (工作单位) as (职位). mr.(ms.) has been entitled to a monthly salary rmb in total.
sincerely yours,
(证明人)
dean of school of software / chief executive officer(证明人职位)
(单位名称)
1234567(电话号码)