Saad Ali Nasir’s Post

“Laravel didn’t fail… my logic did.” And it caused duplicate payments. I was building a payment flow. Everything looked solid. Clean code. DB transactions. Stripe integration. Still… users were getting charged twice. Here’s what actually happened: Two requests hit the server at the same time. Both checked: “payment already exists?” → NO So both continued… And both created a charge 💀 This is a race condition. And Laravel won’t magically protect you from it. Here’s how I fixed it: • Added a DB-level UNIQUE constraint • Used transactions + row locking (SELECT ... FOR UPDATE) • Made the API idempotent (same request = same result) Big lesson: If your logic is “check first, then insert” You’re already at risk. Code doesn’t fail in sequence. It fails in parallel. Have you faced this in Laravel? Or still trusting your if checks? 👀 #laravel #backenddevelopment #softwareengineering #webdevelopment #php #programming #devlife #systemdesign #buildinpublic #coding

Ever wondered what actually happens when you click a button on a website? 👀 Behind that simple action is a complete flow - frontend, API, backend, and database working together in milliseconds. In this short video, we break down how a full stack app works behind the scenes using modern technologies like React, Node.js, and MySQL explained in a simple, visual way. No jargon. Just clarity. If you're building, learning, or scaling applications, understanding this flow changes how you think about performance, architecture, and user experience. #FullStack #WebDevelopment #ReactJS #NodeJS #MySQL #SoftwareArchitecture #CloudComputing #DevOps #BackendDevelopment #FrontendDevelopment #TechExplained #Developers

Ever wondered what actually happens when you click a button on a website? 👀 Behind that simple action is a complete flow - frontend, API, backend, and database working together in milliseconds. In this short video, we break down how a full stack app works behind the scenes using modern technologies like React, Node.js, and MySQL explained in a simple, visual way. No jargon. Just clarity. If you're building, learning, or scaling applications, understanding this flow changes how you think about performance, architecture, and user experience. #FullStack #WebDevelopment #ReactJS #NodeJS #MySQL #SoftwareArchitecture #CloudComputing #DevOps #BackendDevelopment #FrontendDevelopment #TechExplained #Developers

This is how you lose payments without noticing. You integrate Stripe webhooks. Everything seems to work locally. Production comes. Stripe sends a webhook. Your app returns 419. Payments stop. No clear error. The problem: Laravel blocks POST requests without a CSRF token when the route is inside the web middleware. Stripe doesn’t send one. GitHub doesn’t. PayPal doesn’t. So your app silently rejects real money. The fix: ->withMiddleware(function (Middleware $middleware): void { $middleware->preventRequestForgery(except: [ 'stripe/*', 'webhooks/*', ]); }) Or move webhook routes outside the web middleware. Now: webhooks work payments go through no random 419 Every external webhook needs this if it goes through the web middleware. Important: Disabling CSRF is not enough. Always verify the webhook signature. Most developers notice this only after: “Payments are not working.” Have you ever debugged a 419 webhook? #Laravel #PHP #WebDevelopment #Backend #Programming

Stop wrapping everything in useCallback. It's likely making your React app harder to maintain, not faster. I see this in code reviews constantly. A developer learns that useCallback "prevents re-renders" and suddenly every function in the codebase gets wrapped. But useCallback has a real cost: dependency comparison on every render, memory allocation for the memoized function, and added cognitive load when reading the code. It's only worth it in two situations: - You're passing a callback to a child wrapped in React.memo - The function is a dependency inside another hook's dep array If neither applies, you're paying the cost with zero benefit. The rule I follow: profile first, optimize second. React DevTools Profiler shows you exactly which components re-render and why. In 7 years of B2B SaaS work, most "performance" code I've removed didn't move any metric. It just made the codebase harder to read. Premature memoization is still premature optimization. What's the most common "optimization" you've seen in a codebase that actually made things worse? #React #TypeScript

Stop overcomplicating your payment flows. Integrating a payment gateway shouldn't feel like rocket science. When I started working with Flutter and Laravel, the biggest hurdle was understanding exactly how the "handshake" between the frontend, backend, and Stripe actually works. I’ve mapped out this simple architecture to show how easy it can be: Flutter captures the intent. Laravel handles the secure communication. Stripe ensures the money moves safely. Simple. Secure. Scalable. How are you handling payments in your latest build? Let’s talk architecture in the comments! 👇 #FlutterDev #Laravel #Stripe #MobileDevelopment #WebDev #CodingLife #TechArchitecture

🚀 Just deployed my full-stack Banking App! Built with: Next.js (Frontend) Node.js & Express (Backend) MongoDB JWT Authentication Features: ✔ User authentication ✔ Secure money transfers ✔ Transaction history ✔ Protected routes Live Demo: [https://lnkd.in/e95373cC] This project helped me strengthen my full-stack development skills and understanding of real-world application architecture. #webdevelopment #fullstack #javascript #react #nodejs

I deleted 50% of a client's codebase last month. The app is faster. Deploys are quicker. Bugs dropped by 30%. This Laravel project had 6 years of "clutter" including: → 14 unused packages → Dead code from A/B tests that ended in 2020 → 3 different authentication systems It was a classic case of "if it works, don't touch it." But it took 8 minutes to deploy and 2 weeks to onboard new devs. After one week of cleanup: → 45,000 lines reduced to 22,000 → Deployment dropped from 8 minutes to 2 minutes → Tests dropped from 15 minutes to 4 minutes Sometimes the best code you write is the code you delete. Technical debt is not just a nuisance; it is a massive business expense. What is the biggest cleanup you have ever done to a codebase? #SoftwareEngineering #Laravel #TechnicalDebt #CodeQuality

🚀 Quick question for backend devs… Has your Node.js app ever worked perfectly… and then suddenly slowed down under real traffic? Yeah, same here. Let me share something that took me time to truly understand 👇 👉 Node.js is NOT magically parallel. Even if you're using async/await… your CPU-heavy code can still block everything. 💥 Example: A heavy loop or data processing task → blocks the event loop → all requests get delayed 💡 What I do now: ✔ Move heavy tasks to worker threads ✔ Use queues for background jobs ✔ Keep request handlers lightweight ⚡ Lesson learned: “Async doesn’t mean scalable.” If your app slows down under load, don’t just check your APIs… check your CPU usage. Have you ever faced this in production? #nodejs #backend #performance #scalability #javascript #webdevelopment #softwareengineering

A lot of people think web development is just about writing code. But what really matters is solving business problems. For example: A slow website can reduce conversions. A bad checkout system can lose sales. A weak backend can crash under traffic. That’s why I focus on building reliable full-stack systems, not just websites. My development stack includes: • React / Next.js • Node.js / Express • MongoDB • Modern scalable APIs If you’re building a product, startup, or online platform, I’m open to collaborating. Let’s build something impactful. #WebDevelopment #SoftwareEngineering #FullStackDeveloper