Robert Meissner’s Post

React Rule at Factory: No direct useEffect allowed They banned calling useEffect directly in the codebase. For the rare cases needing external sync on mount, they use a single explicit hook: useMountEffect(). Why? Most useEffect usage was creating: Infinite loops Race conditions Hidden dependency hell Flaky refactors Debugging pain (“why did this run?”) This is even more critical now that AI agents are writing frontend code and often add “just-in-case” effects. The team replaced most effects with these 5 clean patterns: Derive state — don’t sync it with effects Use proper data-fetching libraries — no manual fetch + setState Event handlers — not effect flags useMountEffect — only for true external sync (DOM, third-party widgets) Reset with React keys — instead of effect choreography Result: Fewer bugs, easier reasoning, faster onboarding, and a more predictable codebase. It started as a strict rule born from production pain — now it feels like an essential guardrail. Would you adopt a “no direct useEffect” rule on your team? Thoughts? Too extreme or smart discipline? Drop your take below #React #ReactJS #Frontend #WebDevelopment #JavaScript #CleanCode #SoftwareEngineering

https://lnkd.in/d4ZvdajQ — Most people overcomplicate tipping logic, but as a Senior Frontend Engineer, I see it as a masterclass in edge-case handling. 🚀 Building this with TypeScript and Next.js 15 reminded me that even 'simple' tools deserve a robust architectural foundation. 💻 I remember being at a group dinner where 8 people spent five minutes arguing over who owed what. It was awkward and honestly, a solved problem. 🍽️ I built this Tip Calculator to end that friction. Here is a mini-dive into the logic behind it: 1. Input Sanitization: We use controlled components to ensure users don't break the math with non-numeric characters. ⚙️ 2. Real-time Precision: I leveraged Tailwind CSS and shadcn/ui to build a UI that updates as you type, providing instant visual feedback. 3. The Math: Handling floating-point math in JavaScript is notoriously tricky. I implemented rounding strategies to ensure the total is accurate to the cent. 4. Performance: I ran the calculation logic through Vitest using Bun to ensure that edge cases—like zero splitters—don't crash the site. 🧪 5. Workflow: Using Cursor helped me refactor the state management logic for the percentage sliders in record time. 🛠️ It’s not just about the numbers; it’s about making sure the user never has to think twice when the bill arrives. 📈 Everything is optimized for speed because no one wants to wait for a tip calculation to load. ✨ Building tools like this is a great way to keep my fundamental skills sharp while providing real utility. 💡 How do you handle decimal precision and rounding in your own frontend projects? 💬 #TipCalculator #FrontendEngineer #TypeScript #ReactJS #Nextjs #TailwindCSS #WebDev #SoftwareEngineering #Coding #JavaScript #UIUX #CleanCode #DeveloperLife #ProductivityTools #Calculators

🚀 Frontend Performance — Learning in Public Over the last couple of days, I explored Lighthouse-based performance analysis on a real application. Key learnings 👇 🧠 Main Thread Matters 👉 Browser runs on a single thread 👉 Heavy JS → slower interaction 🚦 Render-Blocking Resources 👉 CSS/JS can delay UI rendering ⛓️ Critical Request Chain 👉 Too many dependencies → slower loading 📊 Lighthouse Insight 👉 It’s not about score 👉 It’s about identifying root causes 🎯 Big takeaway: Performance = reduce work + remove blockers 📌 Next: Building a real-world performance audit report #Frontend #WebPerformance #JavaScript #ReactJS #SoftwareEngineering #LearnInPublic

"𝐈𝐭’𝐬 𝐧𝐨𝐭 𝐣𝐮𝐬𝐭 𝐚𝐛𝐨𝐮𝐭 𝐦𝐚𝐤𝐢𝐧𝐠 𝐢𝐭 𝐰𝐨𝐫𝐤; 𝐢𝐭’𝐬 𝐚𝐛𝐨𝐮𝘁 𝐦𝐚𝐤𝐢𝐧𝐠 𝐢𝐭 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞, 𝐬𝐞𝐜𝐮𝐫𝐞, 𝐚𝐧𝐝 𝐢𝐧𝐝𝐮𝐬𝐭𝐫𝐲-𝐬𝐭𝐚𝐧𝐝𝐚𝐫𝐝." 🏗️🚀 I’ve spent the last period diving deep into the architectural side of Frontend Engineering moving beyond basic React to master the advanced patterns used in large-scale applications. This project represents a complete tech-stack transformation for me, where I focused on building a production-ready environment from the ground up. 🛠️📈 💻 𝐓𝐇𝐄 𝐓𝐄𝐂𝐇 𝐒𝐓𝐀𝐂𝐊 & 𝐂𝐔𝐒𝐓𝐎𝐌 𝐈𝐌𝐏𝐋𝐄𝐌𝐄𝐍𝐓𝐀𝐓𝐈𝐎𝐍: 🔐Security & Auth:Full Authentication & Authorization flow using JSON Server Auth, featuring Protected Routes and Guards. 🏗️ Core & Architecture: Advanced React structures designed for scalability and modularity. 💾 State Management: Architected with Redux Toolkit, Redux Persist, and optimized Selectors. 🛡️ Type Safety: 100% TypeScript integration, utilizing Interfaces, Types, and Generics. 🎨 Custom UI Upgrades: Challenged myself by implementing the entire UI with Tailwind CSS and integrating Swiper.js for high-performance carousels. ✅ Forms & Validation: Professional data handling with React Hook Form and ZOD. 🧠𝐀𝐑𝐂𝐇𝐈𝐓𝐄𝐂𝐓𝐔𝐑𝐄 & 𝐏𝐑𝐎𝐅𝐄𝐒𝐒𝐈𝐎𝐍𝐀𝐋 𝐔𝐗: 🧩 Design Patterns: Applied Encapsulated vs Container/View patterns for a clean separation of concerns. ⏳ Smart UX: Implemented dedicated Loading Skeletons and Error states to ensure a seamless user journey. 🔔 Real-time Feedback: Integrated Toast Notifications to provide instant, clear feedback for every user action (Auth, Wishlist, Cart). 💎 Clean Code: Leveraged TS Alias Paths, Narrowing, and advanced logic for a maintainable codebase. It wasn’t just about learning new tools; it was about adopting a professional engineering mindset. Check out the video below to see the project in action! 👇🎬 📎Github: https://lnkd.in/eWhpwMVe Special thanks to Eng. ‏Kareem Nour (Kimz Codes) for the insightful content on his YouTube channel, which was a great roadmap for mastering these advanced concepts. 🙌✨ #ReactJS #TypeScript #TailwindCSS #FrontendEngineering #WebDevelopment

I recently built a nested commenting system (like LinkedIn/Reddit)… and it was more interesting than I expected 👇 At first, it looked simple: “Just allow replies inside comments.” But once I started building it, a few real challenges came up: → Managing deeply nested state without making it messy → Updating a specific reply without re-rendering the entire tree → Keeping the UI performant as the comment depth grows → Handling add/edit/delete operations cleanly What worked for me: ✔ Using recursion for rendering comments ✔ Updating state immutably to avoid unexpected bugs ✔ Memoizing components to prevent unnecessary re-renders One key realization: Building UI is easy. Managing state and updates at scale is where real engineering begins! #React #Frontend #JavaScript #SystemDesign #WebDevelopment #WebArchitecture #SoftwareEngineering

SolidJS looks like React, but its reactivity model works fundamentally differently — and that's where most bugs hide. Components run once, destructuring props breaks everything, and effects aren't meant for deriving state. This article breaks down the patterns that actually matter for writing correct, fast SolidJS code in real applications.

JavaScript isn’t hard unclear logic is. One thing I’ve learned while building real frontend features is this: Most bugs don’t come from JavaScript itself… They come from assumptions we make while writing it. Here’s a simple rule that has saved me countless hours: Always validate your data before using it. Because in real projects, you’re not just writing code you’re handling unpredictable inputs, API delays, null values, and user behavior. A few examples that prevent 80% of silent failures: • Check if an array actually exists before mapping • Confirm API responses before rendering UI • Avoid chaining methods on undefined • Never trust user input without validation • Use optional chaining when the structure isn’t guaranteed Small checks. Big impact. Clean code isn’t about writing more it’s about writing responsibly. When your logic is predictable, your UI becomes reliable. And reliability is what users remember. #JavaScript #FrontendDevelopment #WebDevelopment #CleanCode #TechTips #UIUX #DeveloperLife

Level Up Your React Workflow in 2026 💻 The gap between a "good" and "great" developer often comes down to their tooling. After refining my setup this year, these are the extensions that have made the biggest impact on my React productivity: 1. The Logic & Refactoring Powerhouse VSCode React Refactor: Extracting JSX into a new component used to be a manual chore. This extension does it in two clicks. Error Lens: Instead of hovering over red squiggles, it prints the error message inline. Catch those dependency array issues in useEffect instantly. Console Ninja: Stop jumping between your editor and the browser. It displays console.log output and runtime errors directly in your IDE. 2. Visual & Styling Clarity Tailwind CSS IntelliSense: Essential if you’re in the Tailwind ecosystem. Autocomplete and class previews are lifesavers. Peacock: If you work on multiple React projects at once (e.g., a frontend and a backoffice), Peacock colors each window differently so you never push code to the wrong repo. Fluent Icons: Because a clean, recognizable file tree makes navigating large src folders significantly faster. 3. Beyond VS Code While VS Code is the standard, the landscape is shifting: Cursor: My current favorite. As a VS Code fork, it keeps your extensions but adds native AI integration that makes writing boilerplate React hooks feel like magic. WebStorm: For those who want "Everything Included." Its built-in refactoring for React (like renaming components across the entire project) is still the most robust in the game. The right tools don't just make you faster; they reduce the cognitive load so you can focus on solving actual problems. What does your .extensions folder look like? Anything I missed that I should try out? #SoftwareEngineering #ReactJS #JavaScript #Productivity #CodingLife #WebDev

Excited to share my new project: Task Flow! 💥 After days of designing, coding, and refactoring, I’m thrilled to introduce Task Flow - a modern, fast, and highly interactive Task Management System. The Problem It Solves: We all struggle with cluttered to-do lists that lack proper categorization and lose data the moment you accidentally hit refresh. I wanted to build a solution that is not only visually pleasing and distraction-free but also ensures data persistence and complex filtering right out of the box, without needing a heavy backend. ❓ What is Task Flow? It’s a comprehensive SPA (Single Page Application) that allows users to manage their daily routines effortlessly. It includes: - A dynamic Dashboard providing task insights and analytics. - Advanced filtering (All, Pending, Done) and multi-tier sorting (by priority, date, or title). - A seamless Dark/Light mode toggle. - Categorization, due dates, and priority tagging out of the box. 🛠️ Built With: - React & Vite: For a blazing-fast development experience and optimized builds. - Redux Toolkit: For granular, scalable, and predictable global state management. - Tailwind CSS v4: Used to engineer a highly reusable, custom UI component library (Modals, Badges, Tabs) from scratch. - React Router DOM: For nested layouts and seamless page navigation. - Lucide React & React Hot Toast: Providing beautiful iconography and real-time user feedback. 🧠 What I Learned: This project was a massive leap in my frontend architecture skills!  - I learned how to build a Custom Redux Middleware to seamlessly intercept actions and synchronize my global state with Local Storage - ensuring a 100% offline-ready caching mechanism. - I improved my ability to write Clean Code by extracting duplicated logic into Custom React Hooks (useTaskModal, useTheme). - I transitioned from relying on UI component libraries (like MUI) to building my own scalable UI system using Tailwind CSS, giving me ultimate control over responsive design and theming. I'm incredibly proud of how this turned out! I'd love to hear your feedback, thoughts, or suggestions for improvement. 👇 🔗 [Live Demo / GitHub repo] in the comments 👇🏻 #ReactJS #TailwindCSS #FrontendDevelopment #WebDevelopment #JavaScript #SoftwareEngineering

I just published a complete guide on setting up Claude Code for frontend development If you're working with React + Tailwind, this one's for you. Here's what's covered: → Installing and configuring Claude Code from scratch → Wiring it into a React + Tailwind project → Getting the most out of AI-assisted component building → Tips that save hours of setup time I've been using it in my own workflow and the difference in speed is hard to ignore — especially for repetitive UI work. Drop a comment if you have questions or want me to cover a specific part in more depth. #ClaudeCode #React #TailwindCSS #FrontendDevelopment #WebDev #AI