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Building an app is easy. Building one for millions of users is engineering.
Start small. Scale only when you need to.
Step 1: Single Server One server handles everything. It is cheap but slow as traffic grows.
Step 2: Dedicated Database Move your database to its own server. This separates logic from data.
Step 3: Load Balancer Use a load balancer. It splits traffic across many servers. Your app stays online if one server fails.
Step 4: Database Replication Create read replicas. One server handles updates. Others handle requests for data. This speeds up reads.
Step 5: Caching Use Redis. Store common data in memory. This stops your database from overloading.
Step 6: Content Delivery Network Use a CDN. It puts static files closer to your users. This makes pages load faster.
Step 7: Stateless Sessions Store session data in Redis. This lets you scale your servers horizontally.
Step 8: Message Queues Use queues for tasks like emails. This keeps your user interface fast.
Step 9: Horizontal Scaling Add more small servers instead of one giant server. This is cheaper and safer.
Step 10: Microservices Split your app into small services. Each service handles one job. This makes updates faster.
The path to scale:
- Single Server
- Dedicated DB
- Load Balancer
- Caching
- CDN
- Message Queues
- Horizontal Scaling
- Microservices
Find the bottleneck. Fix it. Repeat.