Is it permissible to design databases for loan programs that serve usurious lending companies?

It is not permissible to design data for usurious lending companies because it is aiding in sin. The Messenger of Allah, peace and blessings be upon him, "cursed the one who consumes usury, the one who pays it, its scribe, and its two witnesses, and he said: 'They are all equal.'" And this benefit is no less important than documenting usurious contracts. Means take the ruling of their ends, so if the goal is forbidden, then the means leading to it are forbidden.