All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
As a general rule, it is permissible to work in this field. However, it becomes prohibited if it involves anything forbidden by Shariah, such as creating designs with prohibited symbols like a cross. In such cases, participating in this work is impermissible because it involves assisting in prohibited actions. Allah, the Almighty, states: {But do not cooperate in sin and aggression. And fear Allah; indeed, Allah is severe in penalty} [Quran 5:2].
Allah knows best.