What is the ruling on working as an applications programmer for an airline and hotel booking company, knowing that the application allows electronic payment through interest-based banks, and that most of the companies and hotels offer alcoholic beverages, and that the company is part of an investment group that deals with interest-based banks?

The original intent behind booking travel seats and hotel rooms is a permissible benefit in itself (transportation and accommodation). Any forbidden matters that may arise from this are only the responsibility of the one who commits them, or one who directly or intentionally aids in them. As for programs and applications that are used for both permissible and forbidden purposes, or for which payment is made through permissible or forbidden means, the original ruling on their design is permissibility; because their use is not restricted to forbidden activities. Therefore, there is no sin in your work for the company in matters that are permissible.