Praise be to Allaah.
There is nothing wrong with
the work you mention, and it does not matter that the administration is
supervised by the finance ministry that supervises the taxes and customs.
What matters is that the work that you do should be free of anything that
goes against sharee’ah. If the work is permissible, then it is permissible
to do it and the salary is halaal.
And Allaah knows best.