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Harrison Guo

Senior backend platform engineer. Distributed systems, Go runtime, LLM agent infrastructure. Writing deep-dive notes at harrisonsec.com

Vancouver, Canada Joined on Mar 6, 2026 gzxharrison@gmail.com https://harrisonsec.com

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Skills/Languages

Go · Python · C/C++ · Distributed systems
LLM agent infrastructure · System internals

35 posts published

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Shrink the Stochastic Surface: A Design Standard for Probabilistic Systems

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Harrison Guo

Jun 30

Shrink the Stochastic Surface: A Design Standard for Probabilistic Systems

#ai #machinelearning #architecture #llm

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11 min read

Generative AI Builds Shapes, Not Games: The Constraint Gap and the Architecture That Closes It

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Harrison Guo

Jun 22

Generative AI Builds Shapes, Not Games: The Constraint Gap and the Architecture That Closes It

#ai #machinelearning #gamedev #programming

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10 min read

I Tested Higgsfield's Minecraft Prompt-to-Build. It Generates Shapes, Not Scenes.

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Harrison Guo

Jun 18

I Tested Higgsfield's Minecraft Prompt-to-Build. It Generates Shapes, Not Scenes.

#ai #gamedev #machinelearning #review

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9 min read

Agent Architecture Is a Compute Allocation Problem: The Advisor Strategy, Cost-Curve Frame Recursed

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Harrison Guo

Jun 16

Agent Architecture Is a Compute Allocation Problem: The Advisor Strategy, Cost-Curve Frame Recursed

#ai #llm #programming #architecture

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17 min read

Agent Retrieval Above the Crossover: A First-Principles Read of CodeGraph

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Harrison Guo

Jun 8

Agent Retrieval Above the Crossover: A First-Principles Read of CodeGraph

#ai #architecture #sqlite #programming

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20 min read

I Tested CodeGraph on Hono. The Tool-Call Savings Reproduce — the Cost Savings Don't.

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Harrison Guo

Jun 1

I Tested CodeGraph on Hono. The Tool-Call Savings Reproduce — the Cost Savings Don't.

#ai #benchmark #devtools #typescript

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13 min read

Agent Memory Is a Cache Coherence Problem

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Harrison Guo

May 29

Agent Memory Is a Cache Coherence Problem

#ai #memory #claudecode #programming

1 comment

15 min read

Agent Retrieval Is a Cost Curve Problem: Why Claude Code Doesn't Use RAG

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Harrison Guo

May 26

Agent Retrieval Is a Cost Curve Problem: Why Claude Code Doesn't Use RAG

#ai #rag #claudecode #programming

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3 comments

21 min read

Channels Aren't Message Passing — How Parked Goroutines OOM-Killed a Pod

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Harrison Guo

May 14

Channels Aren't Message Passing — How Parked Goroutines OOM-Killed a Pod

#go #concurrency #performance #backend

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13 min read

How I Improved an AI Agent from 40% to 60% — With A/B Test Data

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Harrison Guo

May 12

How I Improved an AI Agent from 40% to 60% — With A/B Test Data

#agents #contextmanagement #engineering #testing

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5 min read

Consistency in Distributed Systems: Scenarios, Trade-offs, and What Actually Works

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Harrison Guo

May 6

Consistency in Distributed Systems: Scenarios, Trade-offs, and What Actually Works

#distributedsystems #consistency #saga #systemdesign

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11 min read

Don't Pick One AI. Run Three Against Each Other.

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Harrison Guo

May 3

Don't Pick One AI. Run Three Against Each Other.

#ai #aiagents #productivity #career

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8 min read

Node Turns Waiting Into Events. Go Moves Context Switching Into User Space.

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Harrison Guo

Apr 28

Node Turns Waiting Into Events. Go Moves Context Switching Into User Space.

#go #node #concurrency #javascript

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13 min read

gRPC Interceptors in Production: Design Patterns That Survive Real Load

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Harrison Guo

Apr 20

gRPC Interceptors in Production: Design Patterns That Survive Real Load

#go #grpc #interceptors

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8 min read

Go Generics, One Year In: Which Promises Held, Which Didn't

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Harrison Guo

Apr 20

Go Generics, One Year In: Which Promises Held, Which Didn't

#go #generics #typeparameters

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7 min read

Go Profiling in Anger: pprof, Escape Analysis, and Inlining Without Magic

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Harrison Guo

Apr 20

Go Profiling in Anger: pprof, Escape Analysis, and Inlining Without Magic

#go #performance #pprof

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6 min read

sync.Pool in Go: When It Actually Helps, and When It Quietly Hurts

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Harrison Guo

Apr 20

sync.Pool in Go: When It Actually Helps, and When It Quietly Hurts

#go #performance #syncpool

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6 min read

IronSys: A Production Blueprint for Modern Concurrency

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Harrison Guo

Apr 20

IronSys: A Production Blueprint for Modern Concurrency

#concurrency #systemdesign #go #architecture

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8 min read

Docker Kubernetes: What They Really Changed (It's Not What You Think)

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Harrison Guo

Apr 20

Docker Kubernetes: What They Really Changed (It's Not What You Think)

#docker #kubernetes #containers #devops

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8 min read

Observability and Cost Attribution: Why One Pipeline Isn't Enough

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Harrison Guo

Apr 20

Observability and Cost Attribution: Why One Pipeline Isn't Enough

#observability #billing #costattribution #opentelemetry

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7 min read

The 90% Problem: Why Most AI Agents Are Still Broken

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Harrison Guo

Apr 18

The 90% Problem: Why Most AI Agents Are Still Broken

#agents #architecture #claudecode #openclaw

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7 min read

Testing Real-World Go Backends Isn't What Many People Think

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Harrison Guo

Apr 18

Testing Real-World Go Backends Isn't What Many People Think

#go #testing #backendengineering

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8 min read

Scale-Up vs Scale-Out: Why Every Language Wins Somewhere

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Harrison Guo

Apr 18

Scale-Up vs Scale-Out: Why Every Language Wins Somewhere

#programminglanguages #systemdesign #scale #rust

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7 min read

From Locks to Actors: The Four Pillars of Modern Concurrency

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Harrison Guo

Apr 17

From Locks to Actors: The Four Pillars of Modern Concurrency

#concurrency #systemdesign #go #erlang

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8 min read

RPC vs NATS: It's Not About Sync vs Async — It's About Who Owns Completion

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Harrison Guo

Apr 17

RPC vs NATS: It's Not About Sync vs Async — It's About Who Owns Completion

#distributedsystems #rpc #nats #grpc

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7 min read

Go Context in Distributed Systems: What Actually Works in Production

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Harrison Guo

Apr 16

Go Context in Distributed Systems: What Actually Works in Production

#go #context #concurrency

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8 min read

Go's Concurrency Is About Structure, Not Speed: chan and context as Lifecycle Primitives

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Harrison Guo

Apr 15

Go's Concurrency Is About Structure, Not Speed: chan and context as Lifecycle Primitives

#go #concurrency #channels

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8 min read

Why Go Handles Millions of Connections: User-Space Context Switching, Explained

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Harrison Guo

Apr 14

Why Go Handles Millions of Connections: User-Space Context Switching, Explained

#go #concurrency #distributedsystems

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6 min read

Claude Code Deep Dive Part 4: Why It Uses Markdown Files Instead of Vector DBs

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Harrison Guo

Apr 8

Claude Code Deep Dive Part 4: Why It Uses Markdown Files Instead of Vector DBs

#claudecode #memory #agents #openclaw

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7 min read

Claude Code Deep Dive Part 3: The 5-Level Compression Pipeline Behind 1M Tokens

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Harrison Guo

Apr 8

Claude Code Deep Dive Part 3: The 5-Level Compression Pipeline Behind 1M Tokens

#claudecode #contextengineering #agents #compression

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8 min read

Claude Code + Codex Plugin: Two AI Brains, One Terminal

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Harrison Guo

Apr 7

Claude Code + Codex Plugin: Two AI Brains, One Terminal

#claudecode #codex #agents #openai

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5 min read

Claude Code Deep Dive Part 2: The 1,421-Line While Loop That Runs Everything

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Harrison Guo

Apr 3

Claude Code Deep Dive Part 2: The 1,421-Line While Loop That Runs Everything

#claudecode #agents #architecture #systemdesign

1 reaction

1 comment

7 min read

Claude Code Source Leaked: 5 Hidden Features Found in 510K Lines of Code

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Harrison Guo

Mar 31

Claude Code Source Leaked: 5 Hidden Features Found in 510K Lines of Code

#claudecode #anthropic #agents #security

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5 min read

The AI Stack Explained: LLM Talks, Program Walks

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Harrison Guo

Mar 30

The AI Stack Explained: LLM Talks, Program Walks

#ai #llm #mcp #agents

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6 min read

Why Your "Fail-Fast" Strategy is Killing Your Distributed System (and How to Fix It)

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Harrison Guo

Mar 21

Why Your "Fail-Fast" Strategy is Killing Your Distributed System (and How to Fix It)

#distributedsystems #redis #systemdesign #backend

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9 min read