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🚀 Building a DeFi Staking Platform on SecureChain AI — Final Project Journey
IntroductionAs part of my EtherAuthority Web3+AI Internship, I developed and deployed a DeFi Staking Platform on SecureChain AI (SCAI) Mainnet.This project provided hands-on experience in Solidity smart contract development, blockchain integration, MetaMask wallet connectivity, and decentralized application deployment.🌐 Live Demo:https://de-fi-staking-platform.vercel.app/💻 GitHub Repository:https://github.com/mummanavasanthi/DeFi_Staking_Platform 💡 Project OverviewThe DeFi Staking Pla
Launch HN: TesterArmy (YC P26) – Agents that test web and mobile apps
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Stop Hand-Coding HTML Emails: JSX Templates, Multi-Provider Sending, One TypeScript Library
I shipped a SaaS that sent six transactional emails: welcome, password reset, verification, invoice, payment failed, team invite. Every one was a hand-maintained HTML string with inline styles, nested <table> tags for Outlook, and a prefers-color-scheme block I copy-pasted and always got slightly wrong.Then we switched from Resend to SES for cost. The send code was tangled into the Resend SDK. I touched twelve files. A week later a designer asked to change the button radius across all emai
Migrate from OpenClaw
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Ubiquiti: Enterprise NAS, Built on ZFS
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Swiss parliament lifts ban on new nuclear power plants
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“Simple” live chat almost sank this release
The feature that’s giving me the most trouble right now isn’t some fancy AI or 3D animation. It’s a “basic” live chat system glued to geolocation-based matching and a rating flow that looks trivial in the UI. Under the hood, tying all of this together has been one of the most technical things I’ve shipped so far.This post is a deep dive into how the app is structured, the decisions that aged well (and the ones that didn’t), and the surprising complexity behind “just show nearby users and let the
Next.js 15 Error Handling: error.tsx, Server Actions, and Sentry (2026)
Navigating the Storm: Next.js 15 Error Handling, Server Actions, and Sentry in 2026I've been building web applications for a while now, and one truth remains constant: errors happen. They always do. I still recall the panicked call from a client, "The entire checkout page is blank!" My stomach dropped. Turns out, a seemingly innocuous API call in a deeply nested component had failed, and without proper error boundaries, the whole thing just silently imploded. We were logging some errors, s
Dark Mode in 5 Minutes with salt-theme-gen (No Flash, Zero Extra Dependencies)
The flash of wrong theme on page load is one of the most annoying unsolved problems in web development. You store the user's preference in localStorage, but JavaScript runs after the HTML and CSS, so there's a brief moment where the page renders in the wrong theme.This article shows the complete pattern: generate both themes, inject CSS variables, and prevent the flash with a synchronous inline script. The whole setup takes under 5 minutes. Generate both themes in one callimport { generateT
Building a timezone-safe 52-week planning grid in React
A while ago I had to build a year-at-a-glance planning board: 52 weeks across thetop, grouped program rows down the side, each cell showing whether something isscheduled that week. The kind of grid a field-service team, an agronomist, or amaintenance crew plans a whole year on.It looks like a table. It is not a table. It ate the better part of three weeks,and almost none of that time went where I expected. Here are the parts that aregenuinely hard, with the approaches that finally worked — usefu
JoopJS — I Built an 80+ Service TypeScript SDK for Enterprise Banking & Fintech
After months of building the same financial primitives across different projects — wallets, loan calculators, AML checks, encryption utilities — I got tired of rewriting everything from scratch. So I packaged it all into JoopJS: a single TypeScript SDK with 80+ production-ready services for enterprise banking and fintech applications.Links:📦 npm → npmjs.com/package/joopjs🔗 Live Playground → kundan-leo.github.io/JoopJs/demo💻 GitHub → github.com/kundan-leo/JoopJs What is JoopJS?JoopJS is a fr
The Clean Code Handbook: How to Write Better Code for Agile Software Development
Building scalable software applications demands writing clean code that’s so simple that any dev can understand it.In this article, I’ll explain and demonstrate what clean code is. Then I’ll share my favorite clean code patterns for building modern Agile applications.I won’t use complex jargon. I’ll provide you with simple, clear JavaScript examples that focus on the core concepts. Straight to the point, no nonsense; that’s HOW I roll.Let’s get started. Table of ContentsThe Cost of Bad Code
A Client-Side JWT Debugger That Runs Entirely in Your Browser
Why Another JWT Tool?Most JWT debugging workflows involve copying a token into an online tool, inspecting the payload, and moving on. That works fine for simple use cases, but falls short when you need to do more — sign a token with a specific algorithm, verify a signature against a public key, or quickly check whether a token has expired.The JWT Debugger is a free, browser-based tool that covers the full JWT workflow: decode, inspect, sign, and verify — all in one place, with no installation an
How to Read a webrtc-internals Dump, Section by Section
When a WebRTC call goes bad, the browser already recorded what happened. Chrome keeps a live record of every peer connection at chrome://webrtc-internals, and you can export it to a JSON dump. The problem is that the dump is dense, undocumented, and easy to misread. This is a field guide to reading one by hand: what each section is, what to look at first, and the failure signatures that tell you where the call broke.It assumes you have a dump already. If you do not: open chrome://webrtc-internal
I've been doing Dependency Injection in Node.js without decorators for 9 years. Here's why I still think it's the right call.
Ok so first, let me be honest. This post is partly me venting.I've been maintaining node-dependency-injection for about 9 years now. 300 stars on GitHub. Not exactly viral. And every time I look at InversifyJS or tsyringe climbing in popularity I think "yeah, but at what cost".So let me explain my problem with decorators. The coupling nobody talks aboutWhen you write this:@Injectable()export class UserService { constructor(@Inject(MAILER_TOKEN) private mailer: IMailer) {}}Where does that @
Has W Social switched to closed source?
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ColdFusion WebSocket Support: Building Real-Time Features Without Switching to Node.js
ColdFusion has had native WebSocket support since ColdFusion 10, and — contrary to a common worry — it was not removed or deprecated in the ColdFusion 2025 release (the 2025 removals targeted Flash/Flex-dependent UI tags and mobile features, not WebSockets). The tag creates a client-side JavaScript WebSocket object, you define channels in Application.cfc, and you push messages from server-side CFML with the built-in WsPublish() function. That means you can build live chat, real-time dashboards,
The Ins and Outs of Closings
PrologueA while ago, I decided to develop a fully accessible main navigation component in React and write a series of articles documenting the steps it took to create a non-trivial accessible component.In my last development article, I finally completed keyboard handling for both screen and screen reader users by implementing the last enhancement: sending focus to the top row when entering the component with Shift+Tab. The foundational support for closing sub-lists when their parent closes wa
Visual Regression Testing with Screenshot APIs: Catch UI Bugs Before Users Do
Unit tests check logic. Integration tests check API contracts. But neither catches the CSS regression that moves your checkout button off-screen in Safari, or the z-index bug that hides your navigation on mobile. Visual regression testing fills this gap — and with a screenshot API, it's surprisingly easy to set up. The Core ConceptVisual regression testing works by:Capturing a "baseline" screenshot of each page/componentAfter each deploy, capturing a new screenshotDiffing the two images pix
Emacs 31 Is Around the Corner: The Changes I'm Daily Driving
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