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Your Backtest Can Pass Every Unit Test and Still Know the Future

Your Backtest Can Pass Every Unit Test and Still Know the Future

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6 min read
GMO Coin API in Python: HMAC signing, post-only limit orders, and the 4 errors that will bite you

GMO Coin API in Python: HMAC signing, post-only limit orders, and the 4 errors that will bite you

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6 min read
Your US Stock WebSocket Data Is Probably Out‑of‑Order — Here’s How to Handle It

Your US Stock WebSocket Data Is Probably Out‑of‑Order — Here’s How to Handle It

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4 min read
Phone Login Admin Operations — Exact Lookup, Profile Updates, and Controlled Deletion

Phone Login Admin Operations — Exact Lookup, Profile Updates, and Controlled Deletion

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5 min read
The 48-Hour Verdict: Sort Your AI Failures Before You Fix Them

The 48-Hour Verdict: Sort Your AI Failures Before You Fix Them

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5 min read
Building and using MCP servers: 4 things I learned

Building and using MCP servers: 4 things I learned

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6 min read
A Minimal Production-Ready MCP Server Walkthrough (Auth, Sessions, Error Recovery)

A Minimal Production-Ready MCP Server Walkthrough (Auth, Sessions, Error Recovery)

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5 min read
Rebuilding Python's requests from Scratch (And What I Learned)

Rebuilding Python's requests from Scratch (And What I Learned)

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3 min read
Error Handling Patterns That Actually Scale

Error Handling Patterns That Actually Scale

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4 min read
Why 100% Test Coverage is Deceptive (And How We Made Python Mutation Testing Fast Enough for Pre-Push)

Why 100% Test Coverage is Deceptive (And How We Made Python Mutation Testing Fast Enough for Pre-Push)

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3 min read
Rate-Limited Reminder Recovery: Idempotent Queues After Webhook and Email Send Failures

Rate-Limited Reminder Recovery: Idempotent Queues After Webhook and Email Send Failures

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8 min read
How to Build a Graphical Calculator with Python and Tkinter

How to Build a Graphical Calculator with Python and Tkinter

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3 min read
I gave my STRIDE threat modelling tool an agentic interview mode

I gave my STRIDE threat modelling tool an agentic interview mode

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4 min read
My multi-agent coding system proves its PRs are correct before I see them — and I'm opening it to contributors this Hacktoberfest

Hacktoberfest: Maintainer Spotlight

My multi-agent coding system proves its PRs are correct before I see them — and I'm opening it to contributors this Hacktoberfest

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2 min read
MCP vs. simple scripts: when to actually use MCP in production

MCP vs. simple scripts: when to actually use MCP in production

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6 min read
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