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Two Years with Papers: How I Built My Real "Second Brain" Honestly, I never thought I'd be the kind of person who talks about "second brain
If you’ve worked on a decent-sized Cypress suite, you’ve lived this. You push code. Pipeline kicks off. Then you wait. And you wait. …Still waiting.
Integrating DeepSeek R1 into Your React App: A Comprehensive Developer Guide DeepSeek R1 is a powerful AI-driven API that enables developer
Why setTimeout Is a Bad Metronome — and What to Use Instead I built a web metronome with setInterval(fireClick, 60000/bpm) and it drifted
The Notion MCP Challenge results dropped this week. I've been running MCP servers in production for 30 days. Here's what nobody tells you before you b
You searched for a LangGraph tutorial and found ten articles. Nine of them use set_entry_point(), a function deprecated two years ago. If you've tried
Originally published at recca0120.github.io The previous posts covered DI + Fake + in-memory and sharing Fakes across a monorepo. That approach has o
Note: I used Claude to write this whole article based on my github and youtube video linked at the end. You have a Node.js backend. Somewhe
Note: This post is a translated version of an article originally published on my personal blog. You can read the original Korean post here.
Originally published at recca0120.github.io The previous post covered DI + Fake + in-memory basics. This one takes it further, into a scenario most t
Originally published at recca0120.github.io The most common testing pattern I see looks like this: test('saves user data', () => { const mockSto
If you're still switching layouts manually in your Vue app… you're doing it wrong. Most people, especially beginners, end up writing messy logic just
What if you could just ask a smart contract questions in plain English? "What's the total supply?" → calls totalSupply() → "1,000,000 USDC" "Who is t
Turn-based multiplayer is deceptively hard. Here's how I designed a simple, fast, and cost-effective relay backend that auto reconnects dropped client
Hey DEV community! 👋 Recently, I shared how I completely rewrote the Classic ASP engine from scratch in Go to save legacy applications from Microsoft
Null was a billion-dollar mistake. Falsy was the second. "I call it my billion-dollar mistake. It was the invention of the null reference
I was building a markdown editor for my platform StringTechHub. At some point I needed to decide how to represent the document internally. I could use
After months of building admin panels from scratch for every project, I decided to build a proper starter template. Here's what I ended up with and
If you've built an LLM feature in Spring Boot, you've probably done something like this: created a @Bean with @Tool-annotated methods, wired it into y
This is a submission for Weekend Challenge: Earth Day Edition What I Built green-linter is a zero-dependency CLI tool that scans your proj