Viktor Berczeli’s Post

Evolving React Architecture from Context to Service Layer Today, I took a step toward senior-level React architecture by refactoring my state management logic. Instead of letting a "God Context" handle everything, I introduced a Service Layer for data persistence. By abstracting localStorage logic into a dedicated storage service, I’ve achieved: 1- Decoupled UI & Data: My components no longer care how data is stored. 2- Easier Scaling: Switching from LocalStorage to a real API now only requires touching one file. 3- Clean Code: My Context files are leaner and easier to maintain. Senior-level development isn't just about making things work—it’s about making things scale. #ReactJS #WebDevelopment #SoftwareArchitecture #CleanCode #JavaScript

Node.js is built on an event-driven architecture. Every action — like clicking a button — can trigger an event that runs specific logic on the backend. In this video, I explain how EventEmitter works in Node.js: • Creating custom events • Listening to events using on() • Triggering events using emit() • Real-world flow (like, subscribe, notifications) Example: Frontend action → Event triggered → Backend executes logic This pattern is widely used in: • Backend systems • Real-time applications • Scalable architectures 🎓 Learn Backend Engineering & System Design: 👉 https://lnkd.in/gpc2mqcf 💬 Comment EVENT if you want a deeper Node.js series. #NodeJS #BackendDevelopment #SystemDesign #JavaScript #SoftwareEngineering #APIDesign #DeveloperEducation

Higher-Order Components are often called “old React.” But that’s only half the story. In React, HOCs introduced one of the most important ideas in frontend architecture: 👉 Separating behavior from UI Most developers focus on what components render But scalable systems depend on how behavior is reused That’s where HOCs changed the game: Wrap components without modifying them Inject logic like auth, logging, loading Keep UI clean and focused ⚡ Where HOCs still matter today: • Legacy codebases • Authentication & route guards • Analytics / logging layers • Enterprise abstraction layers 🧠 What I learned working on real systems: Hooks made things simpler — no doubt. But they didn’t replace the idea behind HOCs. Because at scale: 👉 You don’t just write components 👉 You design reusable behavior layers 💡 The real takeaway: HOCs are not about syntax. They’re about thinking in abstractions. And once you start thinking this way — your frontend code becomes: ✔️ Cleaner ✔️ More reusable ✔️ Easier to scale #️⃣ #reactjs #frontenddevelopment #javascript #softwarearchitecture #webdevelopment #coding #reactpatterns

🚀 Anatomy of Angular Microfrontend Architecture As applications scale, a monolithic frontend becomes harder to maintain, deploy, and scale. That’s where Microfrontend Architecture changes the game 💡 This diagram breaks down how a modern Angular microfrontend system actually works in production 👇 🧠 Core Idea A central App Shell (Host App) orchestrates multiple independently developed microfrontends. 🔗 Microfrontends (MFs) Each module handles a specific domain: 🛒 Product / Cart 💬 Chat / Notifications 📊 Dashboard / Analytics ⚙️ Admin / Settings 👉 Built, deployed, and scaled independently ⚙️ Key Architectural Pillars Module Federation → Runtime module sharing Shared Libraries → Reusable components/services Routing Strategy → Controlled by shell Independent Deployment → Faster releases 🧩 Core System Capabilities State Management (NgRx / Signals) Authentication (centralized) Communication (Event Bus / RxJS) API Integration Layer 🔥 Why it matters ✔ Faster team velocity ✔ Independent deployments ✔ Scalable architecture ✔ Better code ownership ⚠️ But be careful Microfrontends add complexity — choose them only when your app and team size justify it. 💬 I’m currently exploring real-world Angular microfrontend implementations and patterns. 👉 Are you using Module Federation or any other approach in your projects? #Angular #Microfrontend #FrontendArchitecture #SoftwareEngineering #WebDevelopment #Nx #Webpack #JavaScript #SystemDesign

🚀 Real-World Angular Mistakes – Series 🚀 Day 6 – Poor Folder Structure (Scaling Disaster) Most Angular developers ignore structure in the beginning: 👉 “We’ll organize later…” 🔥 Reality Check 👉 As the app grows: ❌ Chaos begins ❌ Files everywhere ❌ Hard to maintain 🔴 The Problem In real projects: ❌ Components, services, models mixed together ❌ No clear separation ❌ Shared folder becomes dumping ground 👉 Result? ❌ Slow development ❌ More bugs ❌ High maintenance cost 🔹 Bad Structure (Common) src/app/ components/ services/ utils/ shared/ models/ 👉 Everything grouped by type ❌ 🟢 Better Structure (Enterprise Way) src/app/ core/ services/ interceptors/ guards/ shared/ components/ pipes/ directives/ features/ user/ components/ services/ models/ dashboard/ components/ services/ 👉 Organized by feature ✅ 🧠 Why This Matters 👉 Feature-based structure: ✔ Improves scalability ✔ Makes code easier to navigate ✔ Helps onboarding new developers 🎯 Simple Rule 👉 “Structure by feature, not by type” ⚠️ Common Mistake 👉 Putting everything in: ❌ shared module 👉 Result: ❌ Unmanageable codebase 🔥 Gold Line 👉 “A clean structure is not about rules, it’s about long-term survival.” 💬 How is your current project structured — feature-based or type-based? 🚀 Follow for Day 7 – Overusing ngOnInit (Lifecycle Misuse) #Angular #FrontendArchitecture #CleanCode #Scaling #UIDevelopment

𝗦𝗶𝗻𝗴𝗹𝗲𝘁𝗼𝗻 𝗣𝗮𝘁𝘁𝗲𝗿𝗻 𝗶𝗻 𝗔𝗻𝗴𝘂𝗹𝗮𝗿 𝗦𝗶𝗺𝗽𝗹𝗲 𝗯𝘂𝘁 𝗣𝗼𝘄𝗲𝗿𝗳𝘂𝗹 One of the most used patterns in Angular is the Singleton Pattern and honestly, it’s everywhere. 𝗪𝗵𝗲𝗻 𝘆𝗼𝘂 𝘄𝗿𝗶𝘁𝗲: @𝘐𝘯𝘫𝘦𝘤𝘵𝘢𝘣𝘭𝘦({  𝘱𝘳𝘰𝘷𝘪𝘥𝘦𝘥𝘐𝘯: '𝘳𝘰𝘰𝘵' }) 𝘦𝘹𝘱𝘰𝘳𝘵 𝘤𝘭𝘢𝘴𝘴 𝘈𝘶𝘵𝘩𝘚𝘦𝘳𝘷𝘪𝘤𝘦 {} Angular creates only ONE instance of this service for the entire app. 𝗪𝗵𝘆 𝗶𝘀 𝘁𝗵𝗶𝘀 𝘀𝗼 𝗽𝗼𝗽𝘂𝗹𝗮𝗿? Because real applications need shared state. Think about it:  • Logged-in user data  • Theme settings  • API cache  • Feature flags  • Notifications You don’t want different versions of these in different components. You want one source of truth 𝗥𝗲𝗮𝗹-𝘄𝗼𝗿𝗹𝗱 𝗲𝘅𝗮𝗺𝗽𝗹𝗲 Take AuthService:  • Navbar → shows user info  • Route Guard → checks login  • Interceptor → attaches token  • Dashboard → role-based UI All of them depend on the same instance 𝗧𝗵𝗮𝘁’𝘀 𝘁𝗵𝗲 𝗽𝗼𝘄𝗲𝗿 𝗼𝗳 𝗦𝗶𝗻𝗴𝗹𝗲𝘁𝗼𝗻 Important Singleton is powerful, but don’t overuse it. If everything becomes global state → your app becomes hard to manage. Use it where data is truly application-wide\ Final Thought Angular made Singleton super easy with Dependency Injection — and that’s why it’s so widely used. Clean architecture. Shared state. Less duplication. That’s a win. Follow for more Angular insights  LinkedIn: 𝗵𝗮𝗿𝗶𝘀𝗱𝗲𝘃𝗷𝘀 #Angular #TypeScript #Frontend #WebDevelopment #DesignPatterns #SoftwareEngineering #AngularDeveloper #CleanCode #Programming #DevCommunity#Angularv21

Your TypeScript compiled with zero errors. Your React app still crashed in production. Here is why. 👇 TypeScript gives us a false sense of security. Here is the trap almost every frontend team falls into: const data = await response.json() as User; The Trap: The TypeScript Mirage 🏜️ By using as User, you just lied to the compiler. TypeScript is a build-time tool. It gets completely stripped away before your code runs in the browser. If your microservice backend team accidentally changes a field, or an API returns an unexpected null, the browser doesn't care about your User interface. The bad data flows directly into your React state, and suddenly your users are staring at a white screen of death because data.map is not a function. The Architectural Fix: Runtime Validation 🛡️ Senior engineers do not trust the network. They build boundaries. Instead of just casting types, you must validate the schema at runtime using a library like Zod. 1️⃣ Define the schema: const UserSchema = z.object({ id: z.string(), name: z.string() }); 2️⃣ Infer the TypeScript type from the schema for your UI. 3️⃣ Parse the incoming data: const user = UserSchema.parse(await response.json()); The Result: If the API sends bad data, Zod throws a clean error at the exact network boundary before it ever touches your React components. You catch the bug at the API layer, not in the UI layer. Are you blindly trusting your API responses, or are you validating at the boundary? 👇 #TypeScript #ReactJS #FrontendEngineering #SoftwareArchitecture #SystemDesign #WebDevelopment #FullStack

Spent 3 days debugging dependency injection chaos today. Configuration was scattered everywhere. Testing was a nightmare. I felt lost. Then a teammate asked: "Why aren't you using Injection Tokens?" I had no excuse. It was right there in Angular, and I completely missed it. The fix was beautifully simple. I refactored strategically. The results: ✅ Tightly coupled code → loosely coupled architecture ✅ Environment configs → single source of truth   ✅ Impossible to test → trivial to test ✅ Magic strings everywhere → type-safe tokens ✅ My confidence restored 😅 But here's what really happened: I realized how many developers probably don't know about this. So I documented everything in a comprehensive guide: 🔹 7 real-world injection token patterns with examples 🔹 How to build multi-tenant SaaS configurations 🔹 Factory functions for complex dependency creation 🔹 Advanced patterns: multi-value tokens, aliasing, conditionals 🔹 Testing strategies that actually work 🔹 Complete production-ready dashboard example 🔹 When to use tokens vs. what to avoid If you're building Angular apps, you need to know this. Check it out: https://lnkd.in/db_9_A4f Have you built custom dependency injection patterns with Injection Tokens? What problem did it solve for you? I'd love to hear in the comments 👇 #Angular #DependencyInjection #WebDevelopment #Frontend #JavaScript #SoftwareArchitecture #BestPractices #LessonLearned

🚀 Just launched: express-arch-cli - CLI scaffolder for architecture-aware Express + TypeScript backends with interactive prompts and stack selection I’ve been working on backend systems where setting up a clean, scalable architecture takes time and often ends up inconsistent across projects. So I built something to fix that. 👉 express-arch-cli a CLI tool to scaffold Express + TypeScript backends with architecture awareness Not just templates. It actually understands structure. 💡 What it supports: Clean Architecture Hexagonal Architecture Modular Monolith MVC Plus: DB + ORM selection (Prisma, Drizzle, TypeORM, Mongoose) Pattern-aware setup (Repository, Service, DI, Unit of Work, etc.) Built-in validation (Zod/Yup), logging (Pino/Winston), Swagger Architecture-specific folder structures (not generic boilerplate) Everything is generated through an interactive CLI flow. Command: npx express-arch-cli ⚠️ Note: This is an early-stage release, so you might encounter some bugs or rough edges. If you try it out and run into issues, I’d really appreciate feedback via GitHub. Your support genuinely helps improve it. Github: https://lnkd.in/dya-yf75 NPM: https://lnkd.in/d2w9YjRy Would love to hear thoughts from other devs building scalable backends 🙌 #NodeJS #ExpressJS #TypeScript #BackendDevelopment #SoftwareArchitecture #OpenSource #CLI #Developers #scaffolder