Your descriptions readable in time frame mentioned in [ << brackets >> ]

1. Goals of the System (in short) [ 2 mins ]:

2. System Requirements & Feature expectations (narrowed down Detailed Scope) [2 min] :

3. Use case diagram [ 3 mins ]
   a. Actors in our system:
   b. Top all use cases OR use cases for each Actor:

4. System interface definition [ 2-3 mins ]:
   - APIs of your OO design

5. Class diagram [ 5 mins ]
   a. main classes
   b. UML Class diagram

6. Activity diagrams Or Sequence Diagram [5 mins]
   Use Case1 ...
   Use Case2 ...
   ...

7. Code [15 mins] :
   a. Enums, Data types and Constants
   b. Other important Entities
   b. Concurrency
   c. Design Pattern

8. Bottlenecks [12 mins]:
   1.processing and servers
   2.storage
   3.caching
   4.concurrency and communication
   5.security
   6.load balancing and proxy
   7.CDN
   8.Any other essential case in your mind to solve?