Alexander Kolobov worked as a team lead at one of the biggest social networks, where he led teams of up to 10 members, including SEO specialists, analysts, and product manager. As a developer, he designed, developed, and maintained various features for the desktop and mobile web versions of a social network across backend, frontend, and mobile application APIs. His experience includes redesigning the social network interface for multiple user sections, completely rewriting network widgets for external sites, maintaining privacy settings for closed profiles and the content archiving function, overhauling the backend and frontend of the mail notification system, handling millions of emails daily, creating a system for conducting NPS/CSI surveys that covered the two largest Russian social networks.