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Architect's Guide
Architect's Guide
Aug 29, 2025 · Backend Development

Build a High‑Performance Go IM System with WebSocket: From Basics to Scaling

This article walks you through the fundamentals of instant‑messaging systems, explains the WebSocket protocol in depth, and provides a complete Go implementation for a scalable, high‑availability IM service with registration, authentication, single‑ and group‑chat, emoji and image support, plus optimization and architecture recommendations.

GoIM SystemWebSocket
0 likes · 40 min read
Build a High‑Performance Go IM System with WebSocket: From Basics to Scaling
vivo Internet Technology
vivo Internet Technology
Feb 26, 2025 · Backend Development

Building a Million-User Group Chat System: Server-Side Architecture and Implementation

The article details how to engineer a Web‑based group chat that supports one million members by selecting WebSocket for real‑time communication, using read‑diffusion storage, a three‑layer architecture with Redis routing and Kafka queues, ensuring ordered, reliable delivery via TCP, ACKs and UUID deduplication, calculating unread counts with Redis ZSETs, and handling massive traffic through rate‑limiting, protobuf compression and message chunking.

IM SystemMessage OrderingWebSocket
0 likes · 21 min read
Building a Million-User Group Chat System: Server-Side Architecture and Implementation
Zhuanzhuan Tech
Zhuanzhuan Tech
Aug 21, 2024 · Backend Development

Design and Implementation of a Real-Time Customer Service IM System

This article analyzes the challenges of real-time, reliability, and message ordering in a customer service instant messaging system and presents solutions such as WebSocket adoption, ACK-based reliability, heartbeat mechanisms, and a structured message protocol to ensure efficient and stable communication.

ACK mechanismBackend DevelopmentHeartbeat
0 likes · 11 min read
Design and Implementation of a Real-Time Customer Service IM System
IT Architects Alliance
IT Architects Alliance
Sep 6, 2022 · Backend Development

Building a High‑Performance, Scalable IM System with Go and WebSocket

This article explains the fundamentals of instant‑messaging, dives deep into the WebSocket protocol and its handshake, and provides a step‑by‑step guide with Go code to quickly build a high‑availability, extensible IM system that supports registration, login, single‑chat, group‑chat, file upload and optimization strategies.

GoIM SystemMessage Queue
0 likes · 38 min read
Building a High‑Performance, Scalable IM System with Go and WebSocket
DeWu Technology
DeWu Technology
Jun 29, 2022 · Backend Development

Architecture and Routing Rules of an Online Customer Service System

The article describes an online customer service platform that guides users from robot chat to human agents and satisfaction rating, detailing its visitor‑side interfaces, multi‑console backend architecture, service‑hour schedules, channel‑based routing, queue‑overflow handling, reliable IM messaging with retry logic, SOP knowledge‑base assistance, and session‑termination policies.

BackendIM Systemcustomer-service
0 likes · 9 min read
Architecture and Routing Rules of an Online Customer Service System
Sohu Tech Products
Sohu Tech Products
May 20, 2020 · Backend Development

Refactoring an IM System with Dynamic Proxy and RPC Architecture

This article explains how a Java‑based instant‑messaging system was restructured by replacing raw HTTP calls with API packages, introducing dynamic proxies for transparent RPC, and simplifying the code to resemble local method invocations while improving maintainability and scalability.

BackendDynamic ProxyIM System
0 likes · 5 min read
Refactoring an IM System with Dynamic Proxy and RPC Architecture
转转QA
转转QA
Feb 20, 2019 · Backend Development

Design, Implementation, and Testing of a WebSocket‑Based IM System

This article describes how Zhaozhuan replaced third‑party IM solutions with a custom WebSocket‑based instant‑messaging system, covering background, WebSocket fundamentals, implementation choices, detailed client code, multi‑stage testing (pre‑test, functional, online monitoring), automation with Puppeteer, performance testing using JMeter, and monitoring platform integration.

IM SystemWebSocket
0 likes · 10 min read
Design, Implementation, and Testing of a WebSocket‑Based IM System
21CTO
21CTO
Dec 11, 2015 · Backend Development

From Simple Polling to Scalable Microservices: JD’s Dongdong IM Evolution

This article chronicles the architectural journey of JD’s Dongdong instant‑messaging platform, detailing its early simple polling design, subsequent performance and scalability challenges, and the progressive shifts toward service‑oriented, micro‑service, and cloud‑native architectures that support massive user growth.

Backend ArchitectureIM SystemMicroservices
0 likes · 11 min read
From Simple Polling to Scalable Microservices: JD’s Dongdong IM Evolution