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System Design By First Principles
What is System Design?
Netflix: Millions of streams. Zero downtime.
Uber: Peak demand. Smooth rides.
Zomato: Dinner rush. No breakdowns.
That reliability isn’t luck.
And it isn’t just “good code”.
That’s system design.
When your app is small:
- Few users
- One server
- One database Everything feels easy.
But as users grow:
- Traffic spikes
- Data explodes
- Failures happen
Costs increase
That’s when systems break unless they’re designed to grow.
At its core:
System design is deciding how your system should behave before you start writing code.
It answers questions like:
- Where does the data live?
- What happens during traffic spikes?
- What breaks first—and how do we recover?
- How do system components talk to each other?
There’s an important difference most of us miss:
Coding asks: “Does it work?”
System design asks: “Will it still work at scale?”
Every real system is built from the same basic pieces:
- Clients (apps, browsers)
- Servers (business logic)
- Data stores (databases, caches)
- Network (communication)
- Constraints (cost, latency, scale)
System design is about connecting these pieces so growth doesn’t break everything.
There is no perfect system.
Every decision is a trade-off:
- Speed vs consistency
- Cost vs performance
- Simplicity vs scalability
Netflix’s design isn’t “best”.
It’s best for Netflix’s problems.
That’s the mindset system design builds.
What I’m doing next:
I’m starting to learn system design properly from first principles.
I’m not an expert. I’m learning this as a beginner.
I’ll share all I learn.
Let’s learn this together and see where it goes.
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