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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
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
If you’ve ever visited a small kirana store in India, you already know the workflow is fast, local, and often messy. Many store owners still manage bi
The debug build that wouldn't stop crashing It was 2 AM. I had just spent five days trying to fix the same bug. My game ran perfectly in t
Cloudflare D1: Serverless SQLite at the Edge — Production Patterns Cloudflare D1 is SQLite running inside Workers. You get sub-5ms query la
tRPC v11 + Next.js App Router: End-to-End Type Safety Without REST If you're still writing REST endpoints and then duplicating types on the
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
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: 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
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
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
Everyone learns binary search as the textbook example of O(log n) efficiency. Halve the search space, halve it again, find your answer in logarithmic
Next.js 15 Caching Explained: unstable_cache, React cache, and fetch() in 2026 Next.js caching has three APIs that look similar but behave
Cloudflare Workers AI: Run Edge Inference Without a GPU Server Running AI inference used to mean provisioning a GPU server, managing a mode
Production Webhook Queue with BullMQ and Redis: The Pattern That Actually Scales Every SaaS eventually breaks when a webhook handler times
Why Dashboards Matter for SaaS Every SaaS product eventually needs an admin dashboard. Whether it's monitoring revenue, tracking active use
Complete Error Handling Patterns for Supabase Edge Functions Why Error Handling Matters Edge Functions have three error sources:
Thunderbolt – TypeScript Project: Complete Top Tools Comparison Guide (2026) Best Thunderbolt – TypeScript Project tools compared in 2026.