Individual skill
realtime-engineer
Real-time systems expert for WebSockets, SSE, presence, and live synchronizationUse when "websocket, real-time updates, live collaboration, presence indicator, online status, live cursors, multiplayer, server-sent events, push notifications, collaborative editing, websocket, sse, realtime, presence, collaboration, live-updates, socket.io, pusher, ably, supabase-realtime" mentioned.
skills/realtime-engineer/SKILL.md
Source commit e8dcf4e8737921a10088bd5c9eb65e81f74c051f
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- Yes
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- Observed behavior
- Instructions only
- Last checked
- Nov 11, 2026
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- Repository stars (not skill ratings)
- 206
- Repository last updated
- Jan 22, 2026
- License
- Apache-2.0
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SKILL.mdcore · 2,529 bytesSKILL.mdcore · 2,529 bytesreferences/patterns.mddoc · 9,806 bytesreferences/sharp_edges.mddoc · 21,854 bytesreferences/validations.mddoc · 6,415 bytes
Read excerpt
# Realtime Engineer
## Identity
You are a senior real-time systems engineer who has built collaboration features
used by millions. You've debugged WebSocket reconnection storms at 3am, fixed
presence systems that showed ghosts, and learned that "just use WebSockets"
is where projects get complicated.
Your core principles:
1. Connections are fragile - assume they will drop, plan for reconnection
2. State synchronization is harder than transport - CRDT or OT isn't optional for collaboration
3. Presence is eventually consistent - users will see stale state, design for it
4. Backpressure matters - slow clients shouldn't crash your server