      +---------------------------------+                   /---\                                                               
      |  Web Application Architecture   |                   \___/                                                               
      |                                 |    /---------------------------------\                                                
      +---------------------------------+    -----------------------------------                                                
                                                 |          Users                                                               
         +---------------------------------------+                                                                              
         v                                                                                                                      
      +@-------------------------------+                                                                                        
      |              CDN               |                                                                                        
      |                                |                                                                                        
      +--------------------------------+                                                                                        
         |                                                                                                                      
         v                                                                                                                      
       /------------------------------\                                                                                         
      /         Load Balancer          /                                                                                        
       \______________________________/                                                                                         
                                                                                                                                
         |       |       -------------------------------------------------------------------+                                   
         |       +--------------------------------+          Web Tier                       |                                   
   +-----|----------------------------------------|-----------------------------------------|----------------------------------+
   |     |                                        |                                         |                                  |
   |     v                                        v                                         v                                  |
   |  +---------------------------------+       +---------------------------------+       +---------------------------------+  |
   |  |          Web Server 1           |       |          Web Server 2           |       |          Web Server 3           |  |
   |  |                                 |       |                                 |       |                                 |  |
   |  +---------------------------------+       +---------------------------------+       +---------------------------------+  |
   |     |                                        |          |                              |                                  |
   +-----|----------------------------------------|----------|------------------------------|----------------------------------+
         |                                        |          |                              |                                   
         |         +------------------------------+ +--------+ +----------------------------+                                   
   +-----|---------|--------------------------------|----------|-----------------------+                                        
   |     |         |                 Application Tier          |                       |                                        
   |     |         |                                |          |                       |                                        
   |     v         v                                v          v                       |                                        
   |  +---------------------------------+        +---------------------------------+   |                                        
   |  |          App Server 1           |        |          App Server 2           |   |                                        
   |  |                                 |        |                                 |   |                                        
   |  +---------------------------------+        +---------------------------------+   |                                        
   |     |       |       |                          |       |       |                  |                                        
   +-----|-------|-------|--------------------------|-------|-------|------------------+                                        
         |       |       |                          |       |       |                                                           
 +---------------+ +-----|--------------------------+       |+------+                                                           
+------------------------|----------------------------------+|                                                                  
||       v         v     +-------------------------          v                                                                  
||     .-----------------------------.           /-----------------------------/\                                               
||    |\-___________________________-/|         |         Message Queue       |  |                                              
||     \-________Redis Cache________-/           \____________________________ \/                                               
||                                                                                                                              
||                                                |          |                                                                  
||       +----------------------------------------++---------+                                                                  
|| +-----|-----------------------------------------|---------------------------------+                                          
|| |     |                         Background Workers                                |                                          
|| |     |                                         |                                 |                                          
|| |     v                                         v                                 |                                          
|| |  +---------------------------------+       +---------------------------------+  |                                          
|| |  |            Worker 1             |       |            Worker 2             |  |                                          
|| |  |                                 |       |                                 |  |                                          
|| |  +---------------------------------+       +---------------------------------+  |                                          
|| |     |         |                               |                                 |                                          
|| +-----|---------|-------------------------------|---------------------------------+                                          
||       |         |                               |                                                                            
+--------+-------+-+-------------------------------+-----------------------------------------------+                            
         |       |       |                                                               |         |                            
   +-----|-------|-------|---------------------------------------------------------+     |         |                            
   |     |       |       |         Database Cluster                                |     |         |                            
   |     |       v       |                                                         |     v         v                            
   |                                                                               |                                            
   |   .------------------------------.                                            |    /------------------------------/        
   |  |\-____________________________-/|                                           |   /                              /         
   |   \-_________Primary DB_________-/                                            |  |         Object Storage       |          
   |     |         |                                                               |   \                              \         
   |     |         |                                                               |    \______________________________\        
   |   sync        |                                                               |                                            
   |     |         +------------sync-------------+                                 |                                            
   |     v                                       v                                 |                                            
   |                                                                               |                                            
   |   .-----------------------------.          .-----------------------------.    |                                            
   |  |\-___________________________-/|        |\-___________________________-/|   |                                            
   |   \-_________Replica 1_________-/          \-_________Replica 2_________-/    |                                            
   |                                                                               |                                            
   +-------------------------------------------------------------------------------+                                            
