I open-sourced every Binance and OKX 2026 fee tier as JSON (+ a calculator)
If you've ever written a backtest or a fee-aware order router for Binance or OKX, you've hit this wall: the exchanges publish their fee schedules as H…
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I Failed a Python Interview Because I Could Write Code But Not Read It
I want to tell you about the most embarrassing 45 minutes of my developer career. I had been practicing LeetCode for three months. Easy problems, done…
Ollama Structured Outputs in Practice — Getting Type-Safe JSON from Local LLMs with Pydantic
json.loads(response) fails at a certain point. You told the model "return JSON only," but it added a ```json markdown code fence around everything. A …
AI Doesn't Replace Thinking. It Amplifies It.
One of the biggest misconceptions surrounding artificial intelligence is that it eliminates the need for human thinking. In my experience, the opposit…
From ML Tooling to Analytical Governance: Recent Updates to KMDS
Over the last few months I've been refining KMDS, a framework for building repeatable and auditable machine learning systems. The original motivation …
pdf-pagenum: Fix Messy macOS Preview Page Numbers in PDFs from the CLI
A pip-installable CLI tool that auto-centers off-center page number annotations created by macOS Preview, or batch-adds new ones — with smart content …
Web-Based Security Assessment Platform Using Python, Flask & Open-Source Security Tools
A centralized web-based security assessment platform built with Python and Flask that integrates Nmap, Nikto, WhatWeb, Gobuster, and OWASP ZAP for aut…
How I Tamed AI API Rate Limits with a Simple Queue
A few months back, I was building a content generation tool. The idea was simple: take a list of topics, hit the OpenAI API, and get SEO-optimized art…
Batfish marks Huawei VRP as unsupported — so I built a source-traceable IR for it
If you do network automation, you reach for Batfish . And if you've ever pointed it at a Huawei box, you've hit the wall: Batfish's own source marks H…
Distributing a Python desktop app on Windows and Mac — the full release pipeline
WP Maintenance Manager ships from a single Python codebase to both Windows and macOS. "Python is cross-platform — write once, run anywhere," the sayin…
Python interview questions: what each one actually predicts on the job (2026)
Canonical: this is a cross-post. The original lives at https://four-leaf.ai/blog/python-interview-questions You can find a hundred Python interview qu…
Cloud Architect's 2026 Guide to Cheaper, Faster LLM Inference
Cloud Architect's 2026 Guide to Cheaper, Faster LLM Inference Three months ago I opened our quarterly cloud spend dashboard and almost choked on my co…
Why AI agents can't shop today — and what we're building to change that
AI agents are getting smarter every week. They can browse the web, write code, analyze data. But there's a glaring gap in their capabilities: they can…
Engineering CellFateBench: A Reproducible Python Benchmark for Single-Cell Genomics Reasoning
CellFateBench is a scientific software and benchmark-engineering project for evaluating reasoning over single-cell genomics workflows. The project was…
Cutting My AI Bill by 60%: A Freelancer's Context Window Diary
Cutting My AI Bill by 60%: A Freelancer's Context Window Diary Look, I'll be honest with you. Six months ago I was hemorrhaging money on API calls. No…
How I Cut AI API Costs by 65% — A Freelance Dev's 2026 Guide
How I Cut AI API Costs by 65% — A Freelance Dev's 2026 Guide Three months ago I opened my monthly invoice from a client project and nearly choked on m…
The HTTP Code Your AI Agent Doesn't Handle Yet: 402
Your fetch agent knows two endings to a request. 200 : parse it. 403 : back off, rotate, or skip. That branch has been the whole game for years. There…
Expanding the Sovereign AI Stack: Moving the Specification from Gateway to Local Silicon
When I first introduced the Sovereign Systems Specification and released the initial foundation of the SDK, sovereign-core and its accompanying sovere…
Reduce LLM Token Waste in RAG with Markdown
TL;DR Feeding raw HTML to Large Language Models wastes tokens on markup, scripts, and styling. By rendering dynamic web pages in a headless browser an…
Fast Automatic ML Hyperparameter tuning Using Optuna (w. MLflow model registry and IRIS DB)
This article presents a straightforward approach to automatically and efficiently tune hyperparameters for machine learning models using Optuna as the…
Building an Instagram-powered app without managing scraping infrastructure
When I started building , I needed reliable access to Instagram data. Like many developers, my first instinct was to use a self-hosted solution such a…
Discovering PII Inside InterSystems IRIS
Data privacy regulations such as GDPR, LGPD, and HIPAA demand that organizations know exactly where Personally Identifiable Information (PII) lives in…
I cleaned India's Census 2011 data so you never have to
Every Indian data scientist hits the same wall. You need district-level population data. You go to censusindia.gov.in. You find hundreds of inconsiste…
doceval — eval harness for LLM document extraction pipelines
I kept seeing the same gap: people ship LLM-based document extractors (invoices, receipts, forms) with no systematic way to know how accurate they act…
How I Architected a 99.9% Uptime RAG Stack with DeepSeek — 2026 Guide
How I Architected a 99.9% Uptime RAG Stack with DeepSeek — 2026 Guide I lost sleep over a single p99 spike last March. Our retrieval-augmented generat…
Your Terraform state file is a plaintext secrets store. Mine was too.
Here's a fact that's easy to forget until it bites you: a Terraform state file stores resource attributes in plaintext — and that includes secrets. RD…
I Wish I Knew AI Recommendation Sooner — Here's the Full Breakdown
So here's what happened: i Wish I Knew AI Recommendation Sooner — Here's the Full Breakdown Last quarter I burned through about three billable hours d…
Metering a Paid API Without Overselling: the Credit Ledger Behind a Solo SaaS
I charge per invoice extracted. One upload of a five-invoice PDF should cost five credits, a failed extraction should cost nothing, and a user with on…
I Built a Mini Message Broker in Pure Python and Finally Understood How Kafka Moves Millions of Events
Last year I was on a team that pushed 40 million events per day through Kafka. We had consumer lag alerts, rebalancing incidents, and a whole runbook …
How to Track Local SEO Rankings by City with an API
Local SEO rankings are not the same everywhere. Your website may rank in position 2 in Austin, position 8 in Dallas, and not appear at all in Chicago.…