Netflix - Video streaming app

Millions of users across the globe
Initially - Services were interrupted very frequently
Losing users.
Application - Which was streaming video to users
Applications were going down.

Bigball of code (1000 files) - Millions of lines of code
1. Failure in one place, impacted the whole application
2. 5 modules - 1 module failure will fail all the 5 modules

Cloud
1. Availability
2. Scalibility 
3. Auto Healing

Scaling - Bring up a new server and deploy my application - 10 mins - 3 instances, + 1 (2 mins)
5 modules into 5 diff applications (micro services)
Micro service - each service will do single functionality - Container (pod)

5 applications.
100 users

Login - Twice - 3 instances (A1)
Search/Browsing - 100 - 3 instances + 20 more (A2)
Playing - 5 - 2 more 
Settings/Billing/Account - Rarely
Rating - Rarely

Deploy separately
Scale only the application needed 



Healthcare
-- Member - Create, update, delete, select,.... 
-- Health plan/coverage, - 
-- Doctor/provider/hospital - CRUD,++++
-- Claims - 
-- Payer - Insurance company - pay the claims