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I built KD Screen Guard: A zero-dependency, tamper-resistant lock screen overlay with WebAuthn biometrics & intruder camera capture
Most JavaScript screen lock libraries simply hide the UI.If someone removes an overlay through DevTools or tampers with the DOM, the "security" often disappears. That approach isn't enough for applications handling sensitive enterprise data.I wanted to build something significantly more resilient.🚀 Today I'm excited to release KD Screen Guard on npm.It's a zero-dependency, tamper-resistant screen security library for Vanilla JavaScript, React, and Vue 3, designed to protect sensitive user sessio
The Multiple Browser Tab Token Trap: Synchronizing JWT Refresh Across Browser Tabs
How multiple open browser tabs can accidentally DDOS your auth server, and how to fix it with the Web Locks API.Picture this: You’ve just shipped a state-of-the-art Axios response interceptor. You implemented a mutex lock (isRefreshing) and a promise queue (failedQueue) to handle concurrent 401 errors. You tested it within a single tab, and it worked like a charm. You gave yourself a high-five and closed your laptop.Then, a power user logs in. Like most humans on the internet, they don't use jus
Tile's security is so bad it's a feature for stalkers
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5 Best Sites to Buy Google Reviews in 20265 Star
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I built SellAI – An AI Platform for Sales, CRM & Business Analytics
SellAI 🚀Hi DEV Community!Over the past few weeks I've been building SellAI — an AI-powered platform that helps businesses manage sales, customers and analytics from one dashboard. Main Features🤖 AI Assistant👥 Customer CRM📦 Product Management🛒 Order Management📈 Business Analytics💳 Subscription System🔒 Secure Authentication Built WithReactFirebaseOpenAIVite Live Demohttps://sellai-2ad64.web.app Demo Videohttps://youtu.be/0I0n0snI37MI'd love to hear your honest feedback!Th
I think we've been optimizing the wrong thing...
Most of us have been there.The app feels slow.First instinct?"React is rendering too much."So we start throwing in useMemo(), useCallback(), lazy loading, code splitting... basically every optimization trick we know. But...What if React wasn't the problem in the first place?Imagine someone tells you,"Your application takes 3.7 seconds to load."Cool. 3.7 seconds where?Did the database take too long?Did authentication slow everything down?Did an API decide today wasn't its day?Did the network sudd
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🚀Backend Internals #5: Stop Installing Everything Globally—Understand Local vs Global npm Packages
One of the most confusing topics for beginners in Node.js isn't Express, APIs, or asynchronous programming—it's understanding where npm packages should be installed.When I started learning Node.js, I thought there were only two commands:npm install package-nameandnpm install -g package-nameI knew they both installed packages, but I had no idea when to use which one. Eventually, I realized they solve two completely different problems.If you're learning Node.js, this article will save you from one
The Auth Pattern I Copy Into Every New Project Now
I stopped deciding auth architecture from scratch on every new project. After enough rounds of the same debate — "can we just put the JWT in localStorage for now?" — I settled on one hardened pattern and now I just apply it every time, tweaking only where the app needs a Bearer-token escape hatch (mobile clients, third-party API consumers).Here's the pattern, and why each piece is there. The core decision: httpOnly cookie, never JS-readable storageThe session token gets issued in an httpOnl
SignalForge: Building a Real-Time Agent Control Tower with OpenTelemetry and SigNoz
Building SignalForge: End-to-End Telemetry & Observability with OpenTelemetry and SigNozIn autonomous AI agent systems and modern microservice architectures, knowing what happened isn't enough—you need to know when, why, and how fast it happened. In this post, we'll walk through SignalForge Command Center, a lightweight Node.js/Express telemetry dashboard designed to simulate agent trace streams, calculate real-time Service Level Objectives (SLOs), and export standard OpenTelemetry (OT
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How to Bridge Solana to Polygon Securely
Moving assets from Solana to Polygon opens up opportunities in both ecosystems, but the security dimension adds a layer of concern that's entirely justified. Between 2022 and 2024, bridge exploits accounted for billions in stolen funds, and while the major protocols have hardened considerably, the risks haven't disappeared . This guide walks you through the secure way to bridge Solana to Polygon—what to check before connecting your wallet, how to spot red flags, and exactly what to expect at eac
Back to the Future: Building Offline-First PWAs
The Quest Begins (The "Why")Honestly, I was tired of watching users stare at a blank screen the moment their Wi‑Fi flickered. I’d built a neat little task‑manager app, shipped it, and then got a flood of complaints: “It works great when I’m at home, but as soon as I step into the subway it’s useless.” I felt like Marty McFly stuck in 1955 with a broken DeLorean—no way to get back to the present unless I fixed the damn thing. That “aha!” moment hit when I realized the web isn’t just about
How to Scale a Developer SaaS from 0 to 1 Lessons from Building PromptDev
Building a SaaS product is easy in 2026—technologies like Next.js, Vercel, and AI tools allow developers to launch products in days.However, scaling a developer SaaS from zero to actual traction is where most technical founders hit a wall.When I started building PromptDev.site—a sandbox built specifically for engineers to construct, stack, and benchmark system prompts—I realized that traditional marketing rules don’t work on developers. Developers hate aggressive sales pitches; they care about u
Rauno's Field Notes #2
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Bringing PyTorch Monarch to AMD GPUs
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The Dark Night of Mathematics
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The Matrix Reloaded: Dodging N+1 Queries in Your Web App
The Quest Begins (The "Why")Honestly, I was just trying to ship a simple dashboard that listed users and their recent activity. I wrote a tidy loop: grab all users, then for each user fetch their latest posts. Locally it flew — page loaded in under a second. Push to staging, and suddenly the response time jumped to four seconds. The logs were littered with hundreds of identical SQL statements:SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT 5;One query per user. If you
