Is working as a software developer in a Stock company permissible?

Assalamu Alaykum, recently I received an offer from a company that develops a software where users can buy stocks from different companies. After buying stock their stock will be saved to their pension account and they can only use their stock when they retire. Of course, in that app we develop, there will be some halal stocks alongside haram ones.So in this case is it permissible for me to work there? My role in that company, will be developing and maintaining and app for stock buyers.