Is it permissible to work as a development engineer in the customs authority's clearance systems?

The default ruling concerning customs duties is that they are forbidden. They are only permissible if the state is compelled to impose them to establish essential projects, and its resources are insufficient. If customs duties are forbidden because the state is self-sufficient, or if it spends the money on the interests of officials, then it is not permissible to work on a project related to them, as this falls under the category of cooperating in sin and aggression. However, if the state needs them and these programs are required to regulate its work, then there is no harm in that. It is necessary to verify the matter before proceeding to avoid what is unlawful.