AI ENGINEERING · BACKEND SYSTEMS

Building AI systems that hold up in production

Field-tested notes on AI agents, developer tools, and backend systems—what works, what breaks, and the engineering decisions behind them.

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Long Wang · Engineering Leader · Backend Systems · Applied AI
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mmap() vs read(): When Zero-Copy Is Actually Slower

Is mmap() faster than read()? Compare copying, page faults, readahead, TLB pressure, tail latency, and the workloads where each approach wins.

9 min read
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Claude Code

Claude Opus 4.8 Released, But Not Showing Up in Claude Code? Here's the Fix

Anthropic released Claude Opus 4.8, but the model picker in Claude Code doesn't show it. Here's why it happens, how to …

5 min read
Hermes

Hermes in Practice: Two Saves and a Sharp Edge

4 min read
OpenClaw

OpenClaw Telegram Multi-Agent Routing: Preventing Cross-Talk

4 min read
Claude Code

Claude Code with LongCat-Flash-Chat: Surprising Performance

6 min read
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About

I'm Long Wang, an engineering leader who has been building backend, search, and AI systems since 2008. I write about the practical decisions behind tools and systems that have to work in production.

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