Dionisio Developer
Writing on software, applied AI, product, and career growth, organized in publishing order for direct reading without noise.
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In 2012, Knight Capital lost $440 million in 45 minutes because a deployment script deployed to 7 out of 8 servers. One server still ran the old code. The result: the trading algorithm bought high and sold low, 4 million times, before...
Here's a brutal truth about performance that few people internalize: the bottleneck isn't the CPU. It's the path between the CPU and memory.
In 2020, Jane Street processed over 1 billion market data messages per day. In C++. Citadel Securities moves over $470 billion in daily volume. All in C++.
If you want an AI project that feels more like a product than a toy demo, this one is a strong entry point.
Everything here runs 100% locally, with no external API, no token costs, and full privacy.
If you're just getting started with automation, or you're already a dev and want an unlimited Zapier/Make running on your own infrastructure without spending a single dollar a month, this step-by-step guide is for you.
Hey, dev Twitter crowd. Every day I see it on X: beginners posting “I’m going to quit programming, AI will replace everyone,” intermediates saying “tech layoffs, 2026 is going to be chaos.” I understand the discouragement. I’ve been a...
If you're a developer and have never heard of Site Reliability Engineering, or heard of it but think it's just another buzzword, it's time to understand what lies behind this acronym that became a pillar of big tech companies.
I consider Clean Code one of the greatest classics in the world of software development. Some like it, some criticize it, but everyone definitely knows some concepts that came from this book.
Quick View: — Big-O notation is a way to measure how much time and memory your code can consume as the input grows. Mastering Big-O means identifying cost patterns to make informed decisions.
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