Webiny is a content management system developed by a team of web experts. It has been in closed development for over a year and is specially designed for handling heavy traffic on multi-domain and multi-language websites. The system provides state-of-the-art caching mechanisms and a large set of built-in features that can be expanded. It outperforms open source CMS solutions in terms of memory usage and requests per second. Key features include analytics, SEO, content structure, page editing, menus, multiple domains/languages, themes/templates, image/file galleries, and user permissions.