What if that non-Muslim is a Qadiani/Ahmadi?

3. The ruling on a Qadiani (= archive 056): fundamentally different from ordinary non-Muslims. The finality of Prophethood is a definite creed; a Qadiani is outside the fold of Islam; by the unanimous decision of all the schools of the Ummah, the Fiqh Academy in Jeddah and the Muslim World League, they are in the ruling of an apostate and a heretic (zindiq). Employment under a Qadiani: strictly impermissible and prohibited (unanimous fatwa) — reasons: targeting faith through economic pressure/inducement; being dependent under one who denies the finality of Prophethood is against the zeal of faith and blocking the means. Employing a Qadiani: in ordinary circumstances, complete avoidance is obligatory (the preponderant and agreed position) — a path to mixing, secret preaching and strengthening of the network.

Translated from the original Urdu fatwa.