📘 System Design Codes & Notes

This is my personal, structured roadmap to master System Design — starting from Low-Level Design (LLD), advancing to High-Level Design (HLD), and finally integrating AI Systems in production-ready architectures.

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🎯 Current Progress

🔰 Currently at: Week 2
📅 Started: June 2025
📍 Focus: Low-Level Design (LLD) — Design Pattern: Strategy ✅

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📚 Phase 1: Low-Level Design (LLD)

Covers Object-Oriented Design, SOLID Principles, UML modeling, and 22 essential design patterns.

✅ Completed:

• OOP Concepts
• SOLID Principles
• UML Diagrams (Class, Sequence, Component)
• Singleton Pattern
• Factory Pattern
• Strategy Pattern

🧩 LLD Patterns Roadmap:

✔ Singleton  
✔ Factory  
✔ Strategy  
☐ Observer  
☐ Decorator  
☐ Adapter  
☐ Builder  
☐ Proxy  
☐ Chain of Responsibility  
☐ Command  
☐ State  
☐ Template Method  
☐ Flyweight  
☐ Mediator  
☐ Composite  
☐ Facade  
☐ Bridge  
☐ Memento  
☐ Iterator  
☐ Interpreter  
☐ Visitor  
☐ Prototype  

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🏗 Phase 2: High-Level Design (HLD)

Designing scalable distributed systems used by millions. Will cover:

📌 Concepts:

• What is System Design?
• CAP Theorem, Consistency Models
• Monolith vs Microservices
• Load Balancing, Scaling
• Caching, Consistent Hashing
• SQL vs NoSQL, Indexing, Sharding
• Messaging Queues (Kafka, RabbitMQ)
• API Gateway, Rate Limiting
• CDN, Logging, Monitoring

🛠️ Real Systems to Design:

• URL Shortener
• Social Media Feed
• Food Delivery App
• Video Streaming Platform
• Messaging Appliaction
• Text Editor

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🤖 Phase 3: AI + System Design Integration (Future Phase)

Bringing intelligence to systems using modern AI techniques.

🔗 Includes:

• RAG (Retrieval-Augmented Generation)
• Model Serving with FastAPI, BentoML
• Vector Databases: Weaviate, Qdrant, FAISS
• Agentic Systems: LangGraph, CrewAI
• Feature Stores: Feast
• Monitoring with Evidently, Prometheus

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🚀 Purpose of This Repo

This repository helps me (and others) track a complete system design journey especially for:

• Cracking system design interviews
• Designing real-world scalable apps
• Deploying intelligent AI-enabled systems

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🌐 Connect With Me

• GitHub: @MuhammadTahaNasir
• LinkedIn: Muhammad Taha Nasir
• Portfolio Website: Muhammad Taha Nasir

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⭐️ Star this repository if you're also learning System Design. Let's build together!