How Payment Systems Switch Gateways at Runtime | Understanding the Strategy Pattern

In this video, I build a payment service that can switch between multiple payment gateways at runtime using the Strategy Pattern. I used to think design patterns were just academic OOP concepts… until I started building backend systems that actually needed flexibility. Instead of hardcoding Razorpay, Stripe, PayPal, etc. directly into the business logic, we design a cleaner and more scalable architecture that lets us plug in new providers without rewriting the whole system. Articles you should read after the video: - Strategy pattern (GFG): https://www.geeksforgeeks.org/system-design/strategy-pattern-set-1/ - Factory method pattern (GFG): https://www.geeksforgeeks.org/system-design/factory-method-for-designing-pattern/ - Solid Principles with Real life examples (GFG): https://www.geeksforgeeks.org/system-design/solid-principle-in-programming-understand-with-real-life-examples/ - Github Repo (Server side practicals): https://github.com/muteenk/server-side-practicals - X (Twitter): https://x.com/mk0x0FF - Linkedin: https://www.linkedin.com/in/muteen-nabi-kundangar/ 00:00 Intro - The problem 01:37 Practically understanding the problem 04:08 Multi-Payment Gateway Service 06:30 Strategy Pattern 09:45 Strategy Pattern Implementation 17:33 Other examples 18:35 Outro #backenddevelopment #softwareengineering #systemdesign #designpatterns #python #fintech #paymentsystems #microservices #developers #programming #coding #backend #architecture #learninpublic #computerscience