Visible help, yes. But as a programmer, I help to write HTML/CSS and rails and js code that makes a friendlier and more engaging UI that makes every user's shop

Visible help, yes. But as a programmer, I help to write HTML/CSS and rails and js code that makes a friendlier and more engaging UI that makes every user's shopping experience that much more pleasant; also unlike conventional charities that offer sometimes intangible emotional support, I can quantify "the net happiness add" by Google Analytics, the higher the conversion rate means, higher the user's "engagement" and contribution to my company and shareholder value. I'm also contribute back to the tech community by sharing my code that I experiment on my own during hackathons and weekends on Github. Unlike other professions where things are not as transparent, I love that our field is always on the cutting edge, experimenting with the latest frameworks and technology and sharing the results (be as it may that sometimes it's not as well-documented but I make up for it by writing an enthusiastic blog post about it).