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Design a notification service that, based on events from other services, sends users email, push notifications and SMS, at up to several million notifications a day.Mid-levelСпроектируйте сервис уведомлений для экосистемы Яндекса: разные продукты — Такси, Маркет, Почта — хотят отправлять пользователям пуши, SMS и письма через одну платформу. Как её построить?Mid-level