The bot runs on BotMother, our in-house cross-platform PHP framework, so one codebase serves Telegram and Viber in Ukrainian and Russian. Courses, events and Cambridge exams live in a Laravel + Voyager admin with per-language translations, where managers also read and answer student dialogues. A 32-question placement test maps answers to a CEFR level; oral-test and exam slots come live from Google Calendar. Sign-ups sync to AlfaCRM, and WayForPay payments are confirmed in the chat. I designed the architecture and led the team of three.