London Gates is an educational center for children with offices in England, Latvia, Russia and Italy.
The website is built on a custom ASP.NET MVC engine that originally rendered data from XML files.
I implemented a full-scale backing CMS for it that features page versioning, file management, and CRM API integration.
The biggest challenge was to implement multi-tenancy with separate domains for each branch on top of existing data.
Currently the site has migrated to another platform (presumably Bitrix).