Tag: real-time

System design for nested comments: replies, pagination, real-time updates, and moderation. Frontend architecture and data shape.

System design for Slack/WhatsApp-style chat: WebSocket management, message ordering, offline support, typing indicators, read receipts, search, and file uploads.

System design for toasts, badges, and notification center: queue management, auto-dismiss, priority, read/unread, real-time delivery (SSE/WebSocket), filtering, push notifications, and overflow behavior.