Outside of what you listed: (not all will enhance the experience. Dark patterns also make money) Data Scientist who can use seasonal and news virality patterns

Outside of what you listed: (not all will enhance the experience. Dark patterns also make money) Data Scientist who can use seasonal and news virality patterns to predict hourly load and load balancing Data Scientist for Ads targeting by subreddit CDN person to improve content delivery and caching A person to build a half-decent video player and native integration of widgets/content from commonly linked websites Data Scientist that provides a more curated experience to first time visitors. Shadow profiles exist. Or just a 1st visit 10 sec poll.