CoderRange - AI , Big data , Data Science !.

### Live Demo: From 0 to 1 Million Users – Backend to Frontend, Infra to Scale!

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👩‍💻 Ever wondered how companies like Zomato, Meesho, and Flipkart go from a simple app to handling millions of users per day?
Now it’s your turn to learn the exact tech lifecycle — LIVE, HANDS-ON, and START to SCALE!

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### 🌟 What You’ll Experience LIVE

📱 Frontend Setup

• Modern stack: React + Tailwind + Hooks
• Component Design for Reusability & Performance
• Connecting APIs & Managing State

⚙️ Backend Engine

• FastAPI / Node.js / Golang architecture
• REST vs GraphQL – Design decision walkthrough
• JWT Auth, Rate Limiting, Validation, Error Handling

📡 API Gateway & Microservices

• How to scale with modular services
• Real-world routing patterns
• Load balancing & versioning APIs

💾 Database Layer

• SQL vs NoSQL vs Distributed DBs
• Schema Design for performance
• Indexing, Caching (Redis), and DB Optimization

🔄 CI/CD & DevOps

• GitHub → Docker → Kubernetes
• Real pipeline: Auto-deploy after code push
• Infra as Code with Terraform
• Observability with Prometheus + Grafana

🌍 Global Scalability & Performance

• Handling 1M concurrent users
• CDN (Cloudflare), Caching Layers
• Auto-scaling & High Availability Strategy

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### 🎁 Bonus Perks for Attendees

✅ Get full GitHub codebase after event
✅ Free “Build to Scale” cheat sheet (PDF)
✅ Join live whiteboarding of entire architecture
✅ Certificate + Top 10 contributors get LinkedIn shoutout
✅ Mock system design feedback for selected participants

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### 🧠 Who Should Join?

• 0–2 yrs devs: Learn how pro systems are built end-to-end
• 2–4 yrs: Upgrade your project + DevOps knowledge
• 4–8 yrs: Get clarity on architecture & scale planning
• Anyone building real-world apps who dreams of startup-grade performance

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### Join Zoom Meeting

### 1. Coding Challenge: Implementing a Ring Buffer for UART Communication (25 mins)

Objective: Design a lock-free ring buffer in C/C++ for UART data transmission and reception.
Key Concepts:

• Interrupt-driven programming
• Circular buffer management
• Memory safety and performance optimization

Discussion Points:

• Avoiding data corruption in ISRs
• Buffer overflow/underflow handling
• Lock-free vs mutex-based buffer access

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### 2. Face-to-Face Debugging Simulation: Memory Corruption in Embedded Systems (25 mins)

Scenario: A memory corruption issue crashes a sensor driver after several hours of uptime.
Tasks:

• Analyze code to find stack overflows or buffer overruns
• Use tools like Valgrind or GDB to reproduce and debug

Key Concepts:

• Stack vs heap memory in embedded systems
• GDB backtracing, watchpoints, and memory inspection
• Defensive coding practices

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### 3. System Design Session: Real-Time Data Logger on Embedded Linux (35 mins)

Objective: Design a real-time logging system that collects sensor data and writes to SD card or flash reliably.
Discussion Points:

• File I/O and flash memory wear-leveling
• Real-time constraints and thread prioritization
• Data integrity and journaling mechanisms

Key Concepts:

• `pthread`, `mmap`, direct I/O
• Real-time scheduling (SCHED_FIFO)
• Handling power failures and ensuring data safety

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### 4. Real-World Product Issue: Recovering from Kernel Panic or Watchdog Timeout (25 mins)

Scenario: A field-deployed embedded device reboots frequently due to unknown kernel panics.
Tasks:

• Enable kernel crash dumps and analyze logs
• Implement watchdog-based recovery mechanism

Key Concepts:

• Kernel panic handling and `kexec`
• Watchdog timers (hardware/software)
• System reliability and boot-time diagnostics

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### 5. Q&A and Embedded Roundtable (30 mins)

Open forum:

• Bring your toughest bugs and real-world embedded Linux challenges
• Discuss build systems (Yocto, Buildroot), device trees, or bootloaders (U-Boot)
• Interview insights for firmware and embedded software roles

Join Zoom Meeting

From Theory to Source Code: Internals That Drive Your Database”
🧠 Explore, Decode & Rebuild Core Database Engines Like the Pros

📅 Date: Aug 3th, 2025
⏰ Time: 6:30 PM – 9:30 PM IST
Join Zoom Meeting

### 1. Coding Challenge: Build a Dynamic Form with Validation & Reusability (25 mins)

Objective: Implement a dynamic form component in React that accepts JSON schema and renders inputs with built-in validation.
Key Concepts:

• Controlled components and form state
• Reusable components with props and context
• Validation (custom + libraries like Yup)

Discussion Points:

• Schema-driven UI design
• Managing deeply nested form data
• Performance with large forms (memoization, virtualization)

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### 2. Debugging Simulation: Resolving React Memory Leaks (25 mins)

Scenario: A React dashboard gradually slows down and crashes after prolonged use.
Tasks:

• Identify and fix memory leaks from event listeners, intervals, or subscriptions
• Apply cleanup with `useEffect` and test with Chrome DevTools

Key Concepts:

• React lifecycle (`useEffect`, cleanup, unmount)
• Debugging with React DevTools + Profiler
• Preventing zombie subscriptions and stale state

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### 3. System Design Session: Designing a Component Library for an Enterprise App (35 mins)

Objective: Architect a scalable and themeable component library with Storybook integration.
Discussion Points:

• Atomic design principles
• Style systems (Tailwind vs Styled Components)
• Component composition and accessibility

Key Concepts:

• `React.forwardRef`, `useImperativeHandle`
• Design tokens and theme context
• Publishing as NPM package

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### 4. Real-World Product Issue: Handling Global Error Boundaries & Logging (25 mins)

Scenario: In production, certain user flows result in blank screens with no feedback.
Tasks:

• Implement a global error boundary that logs to an external service
• Display fallback UIs with user-friendly messaging

Key Concepts:

• `componentDidCatch` vs `useErrorBoundary`
• Integration with Sentry, LogRocket, or custom loggers
• Ensuring observability in SPAs

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### 5. Q&A and React Roundtable (30 mins)

Open forum:

• Discuss real-world challenges like hydration errors, performance bottlenecks, or state explosion
• Interview insights for React engineers (2–6 YOE)
• Live review of participant projects or portfolio advice

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> ✅ Bonus Add-on for Recruiter/Team Use:
> Series 2 – "ReactJS Pro Advanced":

• React + GraphQL integration
• State machine with XState
• Lazy loading, code splitting, SSR & hydration
• Testing React apps with Cypress + Jest

Join Zoom Meeting