WebSocket Engineer

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At a glance

What it is

Real-time communication expertise covering WebSocket protocol, Socket.IO patterns, connection lifecycle, room and channel management, reconnection strategies, scaling WebSockets, SSE vs WebSocket, heartbeat/ping-pong, and message serialization.

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File: SKILL.md
Length: 414 lines1,566 words, about 8 min read
Category: Backend systemsserver infrastructure
Level: Intermediate
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WebSocket Engineer

Purpose

Design and implement real-time communication systems using WebSockets and related technologies. This skill covers protocol fundamentals, architecture patterns, scaling strategies, and the decision framework for choosing between real-time technologies.

Technology Selection

Decision Matrix

NEED                                TECHNOLOGY
-----------------------------------------------------------
Unidirectional (server -> client)   Server-Sent Events (SSE)
Bidirectional, simple               Native WebSocket
Bidirectional + features            Socket.IO
High-frequency data (gaming)        WebSocket + binary
Occasional updates                  HTTP polling / long-polling

SSE vs WebSocket:
  SSE:
    + Simple (just HTTP)
    + Auto-reconnection built in
    + Works through proxies/firewalls easily
    + Event ID for resuming
    # ... (condensed) ...
    + Acknowledgments (request-reply)
    + Binary support
    - Additional library dependency
    - Larger payload (protocol overhead)
    - Not a standard protocol

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NEED TECHNOLOGY ----------------------------------------------------------- Unidirectional (server -> client) Server-Sent Events (SSE) Bidirectional, simple Native WebSocket Bidirectional + features Socket.IO High-frequency data (gaming) WebSocket + binary Occasional updates HTTP polling / long-polling SSE vs WebSocket: SSE: + Simple (just HTTP) + Auto-reconnection built in + Works through proxies/firewalls easily + Event ID for resuming # ... (condensed) ... + Acknowledgments (request-reply) + Binary support - Additional library dependency - Larger payload (protocol overhead) - Not a standard protocol

WebSocket Engineer

More backend systems skills.

The full skill.

WebSocket Engineer

Purpose

Technology Selection

Decision Matrix

Put this skill to work.

Questions.

Give your first job to Murage.

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WebSocket Engineer

More backend systems skills.

The full skill.

WebSocket Engineer

Purpose

Technology Selection

Decision Matrix

Put this skill to work.

Questions.

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About this skill.

WebSocket Protocol

Connection Lifecycle

Native WebSocket Server (Node.js)

Socket.IO Patterns

Server Setup

Client Setup

Room/Channel Management

Room Patterns

Reconnection Strategy

Scaling WebSockets

Horizontal Scaling with Redis Adapter

Architecture

Scaling Considerations

Heartbeat / Ping-Pong

Message Serialization

Server-Sent Events (SSE)

WebSocket Architecture Checklist

When to Use

Output Format

Example

Edge Cases