Is it permissible to work for foreign companies specializing in programming computer games that may contain Sharia violations, with the aim of gaining the necessary experience to establish an Islamic company for producing purposeful games free from Sharia prohibitions?

May Allah reward you for your good intentions and your concern for the youth of the Ummah. Indeed, the enemies have succeeded in their intellectual invasion due to weak oversight, poor upbringing, and the absence of Islamic alternatives. If you are able to produce purposeful games and programs that instill Islamic values, educate the youth on good role models, and teach them the history of their Ummah, then that is excellent. There is no harm in you working for those companies to gain experience, provided that your work is in what is permissible and you avoid what is not, for a noble goal does not justify an evil means.