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Static diagrams don't fail. Systems do. That was the problem I kept running into when practicing system design. I'd draw boxes and arrows, convince m
What I wish I had before submitting my first MV3 Chrome extension While working on Chrome extensions, I ended up rewriting the same release
I built a Chrome extension to save pages with tags, notes, search, and local backup I built a Chrome extension called WebClip. It helps yo
Starting a new business in 2026 is exciting, but it can also feel a little overwhelming, especially when it comes to picking the right technology stac
As a Linux enthusiast, I’ve always been fascinated by how this operating system is structured — it feels like peeling back the layers of a well-design
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Every request in a multi-tenant SaaS needs to answer a dozen questions before your controller runs. Which company context? Is the session valid? Is th
CQRS in Go series: Part 1: the aggregate, Transition() and Clone() Part 2: command handlers without side effects Part 3: sagas and event chor
Apache is one of the most widely used web servers because it can serve multiple technologies side by side. With mod_php, it executes PHP scripts, and
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I Built an AI That Remembers You (No Login Required) Every AI chat I used felt the same. You talk. It replies. You refresh… And suddenl
Apache Virtual Hosts allow you to host multiple websites or applications on a single server. Each domain or subdomain can point to its own directory,
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A new browser-based tool on sjf4j.org turns JSON Schema into Java scaffolding directly in the browser. Paste a schema, tune the generation strategy,
I was alt-tabbing 10 times a morning just to check Docker status and GitHub PRs. This is 2026. That information should come to you. So I built Hiyok
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Yesterday I had an idea. Today it's on Gumroad making money. Here's exactly how I shipped HiyokoBar — a menu bar HUD for engineers — in a single day.
Figma and PHP serve very different roles in web development, but many businesses compare them when deciding how to build a modern website. Figma is u
When I released Lottie4J 1.1.0, I mentioned something a bit embarrassing in the release notes and this blog post: there was a new unit test to compare
Originally published at hafiz.dev A new user registers on your SaaS. You need to send a welcome email, provision their free trial, log the signu