System Design Approach

1. → Step 0:  Understand the Problem before coming to conclusion
2. → Step 1: Functional Requirements / Minimum viable Product ( MVP)
3. → Step 2:  Estimation of Scale ( Back of the envelops calculations)
   1. Compute or Storage
   2. Read heavy or Write heavy or Both
4. → Step 3:  Tradeoffs
   1. C or A
   2. Stateless or Stateful
5. → Step 4: System Design deep dive
   1. APIs
   2. System Design diagram ( Components)
   3. Data Flow

→ In HLD interview, be the driver. don’t wait for Interviewer to talk
→ In HLD interview use 5 step process to show breadth and use Step 4 Design Deep

List of Trade off ( For My Reference )

Number of People on Earth is 8 B ( Planet Scale)

Peak Query per second for estimation use 2 twice the Av. Query per second ( for Estimations)

Any feature which is essentially a performance Trade off bit it is must have in a MVP it should be part NFR