Senior Engineering: The Art of Subtraction in MERN Stack

Backend dev diary, post 3. (Catch up on posts 1 & 2 on my profile.) This one doesn't have a clean resolution. I'm sharing it anyway. Some of my endpoints are slow. Not catastrophically slow, but slow enough to notice. The frustrating part: there's barely any load on them. No heavy traffic, no complex queries hogging resources, the code is lightweight. So why? Honestly, I'm still working through it. My leading suspects right now are cold starts from the server spinning down on the free tier, and possibly some unoptimized Prisma queries doing more work than they need to. But I haven't nailed it down yet. What I've learned just from investigating: performance issues in the backend aren't always obvious. With frontend, slow usually means you can see it. With backend, slow can hide behind a dozen different layers — database, network, server config, query structure — and you have to eliminate them one by one. I'll share the answer when I find it. Next post is about something I haven't solved at all yet. Race conditions in my AuthMiddleware. #buildinpublic #backend #nodejs #webdev #learninpublic #softwaredeveloper

🏠 Just shipped something I'm genuinely proud of — a full-stack Property Rental Platform built from scratch! Searching for a flat shouldn't feel like solving a puzzle. So I built a platform that makes it seamless — for both tenants and property owners. 🔍 What it does: ✅ Browse & explore available properties with rich details 📅 Interactive booking calendar with real-time availability 💳 Multi-payment support — Stripe (Cards), UPI & Cash 👤 Dedicated dashboards for tenants & property owners 🔧 Maintenance request system built in ⭐ Tenant review & feedback system ⚙️ Tech Stack: → Frontend: Next.js + TailwindCSS + TypeScript → Backend: Node.js + Express.js + TypeScript → Database: MySQL (v8) + Prisma ORM → Payments: Stripe API Integration Building this taught me so much about full-stack architecture, payment gateway integration, and designing for real-world user flows. Every feature was a new challenge worth solving. 💡 🔗 GitHub Repo: https://lnkd.in/gWCmT6e8 If you're a developer, recruiter, or just someone who appreciates clean code — drop a ⭐ on the repo, it means a lot! 👇 Would love your feedback in the comments! #WebDevelopment #FullStack #NextJS #NodeJS #TypeScript #React #Stripe #OpenSource #BuildInPublic #StudentDeveloper #ProjectShowcase #PropertyTech #TailwindCSS #MySQL #Prisma #100DaysOfCode #Programming #Tech #IndianDeveloper

Today was a deep dive into the world of software development! I spent the day breaking down the components that make our favorite digital products work. Here’s a quick recap of the "big picture" I explored: 🎨 Frontend (The User's View): I learned how we build what users see and interact with. We discussed the core trio (HTML/CSS/JS) and modern frameworks like React and Vue that make interfaces fast and responsive. ⚙️ Backend (The Engine Room): The logic happening behind the scenes! We looked at how servers process requests using languages like Node.js, Python, or Java, and the frameworks that keep everything organized. 🗄️ Databases (The Memory): Data storage isn't one-size-fits-all. I learned the difference between: SQL: Structured and organized (like a neat filing cabinet). NoSQL: Flexible and scalable (perfect for rapidly changing data). 🌐 Web vs. Mobile: We compared how apps are built for browsers versus native phone environments and the infrastructure (servers/cloud) that hosts it all. Understanding how these pieces fit together is like learning the blueprint of a skyscraper before you start laying bricks. I’m excited to keep building! #SoftwareDevelopment #FullStack #TechLearning #Frontend #Backend #CodingJourney #WebDevelopment

🚀 𝗧𝗵𝗿𝗲𝗲 𝗦𝗶𝗺𝗽𝗹𝗲 𝗖𝗵𝗮𝗻𝗴𝗲𝘀 𝗧𝗵𝗮𝘁 𝗜𝗺𝗽𝗿𝗼𝘃𝗲𝗱 𝗠𝘆 𝗡𝗼𝗱𝗲.𝗷𝘀 𝗔𝗣𝗜 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 I improved my 𝗡𝗼𝗱𝗲.𝗷𝘀 𝗔𝗣𝗜 𝗽𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 by 𝟰𝟬% with just 𝟯 small changes. Here is what I learned 👇 While working on 𝗯𝗮𝗰𝗸𝗲𝗻𝗱 𝗔𝗣𝗜𝘀 using 𝗡𝗼𝗱𝗲.𝗷𝘀 and 𝗘𝘅𝗽𝗿𝗲𝘀𝘀, I noticed some slow response issues. After analyzing the problem, I implemented these improvements: ⚡ 𝟭️⃣ 𝗔𝗱𝗱𝗲𝗱 𝗽𝗿𝗼𝗽𝗲𝗿 𝗱𝗮𝘁𝗮𝗯𝗮𝘀𝗲 𝗶𝗻𝗱𝗲𝘅𝗶𝗻𝗴 This significantly improved query execution speed. ⚡ 𝟮️⃣ 𝗜𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁𝗲𝗱 𝗽𝗮𝗴𝗶𝗻𝗮𝘁𝗶𝗼𝗻 instead of loading large datasets This reduced server load and response time. ⚡ 𝟯️⃣ 𝗢𝗽𝘁𝗶𝗺𝗶𝘇𝗲𝗱 𝗮𝘀𝘆𝗻𝗰 𝗾𝘂𝗲𝗿𝗶𝗲𝘀 and removed unnecessary loops This helped avoid blocking the event loop. 📈 𝗧𝗵𝗲 𝗥𝗲𝘀𝘂𝗹𝘁: ✔ Faster API responses ✔ Better server performance ✔ Cleaner backend code 💡 Sometimes performance improvements don’t require complex architecture — just better coding practices. Backend development is all about writing efficient and scalable APIs. 💬 What is one Node.js optimization tip you always follow? #NodeJS #BackendDevelopment #SoftwareEngineering #ExpressJS #Programming #API

One thing I stopped doing as a developer recently: Building features without thinking about scalability. Earlier my focus was simple: “Does this work?” Now my focus is different: • how many re-renders will this cause in React? • is this API response future-proof? • can this schema handle growing data? • will this logic break under higher traffic? • is this component reusable across modules? That shift completely changed how I write code. Because production-level applications are not about writing more code. They’re about writing predictable, maintainable systems. Big lesson: Clean data flow + structured APIs + controlled rendering make applications faster and easier to scale What’s one change that improved the quality of your code recently? #ReactJS #NodeJS #FullStackDeveloper #SystemDesign #WebDevelopment #SoftwareEngineering

“MERN Stack Developer” is just a label. The real work happens in the logic between the layers. I’ve spent the last 1.6 years building with MongoDB, Express, React, and Node. But if you stripped those tools away today, the value I bring isn’t just about writing code it’s about architecture and user experience. In 2026, being a “Full Stack Developer” means more than just connecting a database to a frontend. It’s about Skill Agility. Here are three non-negotiable skills I’m doubling down on: 🔹 System Architecture > Syntax It’s one thing to build a landing page with Next.js and Tailwind it’s another to ensure the backend can scale when real data hits. 🔹 User-Centric Logic From working on real-time projects, I’ve learned A “clean” UI is useless if the underlying data flow doesn’t solve user frustration. 🔹 The “Human” Full Stack Technical skills get you the interview Adaptability and clear communication with HR and stakeholders get the project across the finish line. The stack will change Trends will evolve But the ability to solve real business problems will always stay relevant. If you had to move to a completely different tech stack tomorrow, which of your core skills would stay exactly the same? Curious to hear from fellow devs 👇 #MERNStack #FullStackDeveloper #NextJS #WebDevelopment #CareerGrowth

“Wait… did I just delete my entire backend?” 🤯 That’s exactly what it feels like using the latest features in Next.js. We’ve officially entered the era where your frontend framework IS your backend. 🔥 The game-changer: Server Actions No APIs. No controllers. No routes. Just write this 👇 async function createUser(formData) { "use server" await db.user.create({ data: formData }) } And call it directly from your UI. That’s it. You just built a backend endpoint… without building one. ⚡ Real Example (this blew my mind) Imagine a simple login/signup flow: Before: • Create API route /api/signup • Handle POST request • Validate data • Connect DB • Return response • Call API from frontend Now with Next.js: async function signup(data) { "use server" await db.user.create({ data }) } <form action={signup}> <input name="email" /> <button>Sign up</button> </form> No fetch. No API layer. No headache. 🧠 Why this is a big deal • Less code → faster shipping • No context switching between frontend/backend • Built-in security (runs on server only) • Direct DB calls • Works perfectly with streaming + React Server Components 🚀 Bonus: It scales globally by default Deploy on Vercel → your “backend” runs across the globe (Edge + Serverless). ⚠️ But don’t get carried away This doesn’t kill backend engineering. You’ll still need: • Background jobs • Complex business logic • Microservices at scale 💡 The real shift We’re moving from: 👉 “Frontend + Backend” to 👉 “One framework that handles both” And honestly… it’s addictive. Curious — would you trust your entire backend to Next.js? 👀 #NextJS #React #FullStack #WebDev #JavaScript #StartupTech #BuildInPublic #Techtrends

🚀 Day 2 of building DevMirror — Designing a real full-stack architecture It started two days ago. Today was about structuring things the right way. I began turning DevMirror into a real full-stack application using Angular and NestJS — with a focus on clean and scalable architecture. 🔧 What I built today: Backend (NestJS) Created a modular architecture (users module) Implemented REST endpoints: POST /users GET /users Applied best practices: Controllers → handle requests Services → business logic DTOs → validation Frontend (Angular) Initialized project structure Created core modules: core/ → services, global logic shared/ → reusable components features/ → business modules (users, projects…) Set up basic service to connect to API 🧱 Architecture overview: Frontend (Angular) ⬇️ HTTP (REST API) Backend (NestJS) → Controllers → Services → Database (PostgreSQL - next step) 💡 Key learning: Building features is important. But designing how everything connects is what makes you a real engineer. I’m focusing on: Separation of concerns Scalability from day one Writing code that can evolve into a real product Next step 👉 Database integration + authentication (JWT) I’m building this in public — sharing the real process, not just the final result. If you're learning full-stack development or working with Angular/NestJS, let’s connect 🤝 #Day2 #BuildInPublic #FullStack #Angular #NestJS #SoftwareEngineering #DevMirror

🚀 Most Node.js projects don't fail because of bad code — they fail because of bad structure. When your codebase is small, everything lives in index.js and life is simple. Then the project grows. Suddenly: ❌ Routes are scattered ❌ Business logic bleeds into controllers ❌ No one knows where anything lives Here's the folder structure that's saved me on every serious project: 📁 src/ ├── config/     → env vars, DB config, constants ├── controllers/  → handle HTTP request/response only ├── services/    → all business logic lives here ├── models/     → DB schemas & data shapes ├── routes/     → clean route declarations ├── middlewares/  → auth, error handling, logging ├── utils/     → pure helper functions └── app.js     → bootstrap & wiring The golden rule? Controllers should be thin. Services should be fat. If your controller has an if/else chain — it belongs in a service. This one change made my code: ✅ Easier to test ✅ Easier to onboard new devs ✅ Way easier to debug at 2am Bookmark this. Your future self will thank you. 🙏 What does your Node.js structure look like? Drop it below 👇 #NodeJS #ProjectStructure #BackendDevelopment #SoftwareEngineering #WebDevelopment #JavaScript #CleanCode #NodejsProjectStructureThatScales #100DaysOfCode #TechTips

⚙️ This screen shows code… but the real work is happening where you can’t see. Everyone notices the interface. Few think about the system handling every click, every request, every edge case behind it. Doorstep is taking shape here, but beyond this setup is the real engine: APIs, database design, and the logic that keeps everything fast, reliable, and scalable. 🧠⚡ Backend engineering isn’t loud… but it’s what makes everything work. Still building. Still learning. Still refining systems that don’t break under pressure. 🚀 Quick one; What do you think matters more in a product: ⚡ speed or 🧱 scalability? #BackendEngineering #BuildInPublic #NodeJS #ReactJS #SoftwareDevelopment