What is the ruling on a Muslim working as a computer engineer in a software company owned by Christians, if the company begins to create websites for liquor stores and factories, with a high probability of his work overlapping in this area, despite the presence of other Muslims who do not wish to leave the company?

If programming work is limited to permissible activities and has no connection to forbidden websites, then there is no harm in remaining in the job, as it falls under the category of hiring for permissible work, unless it involves assisting in the forbidden. It is disliked to deal with those whose wealth is mixed. However, if programming and design work is integrated for websites promoting alcohol or other reprehensible things, then one must leave the job, because it is not permissible to directly engage in forbidden acts or to assist in them.