Neo Kim
@systemdesign.one
I Teach You System Design • 400K+ Audience
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Join 170K+ Subscribers → https://newsletter.systemdesign.one/welcome
Here are some probabilistic data structures you must know as a software engineer (not kidding):
They trade accuracy for space efficiency.
They're often used in:
• Databases
• Cache
• Search engines
• Network infrastructure
• Analytics
What else should make this list?
They trade accuracy for space efficiency.
They're often used in:
• Databases
• Cache
• Search engines
• Network infrastructure
• Analytics
What else should make this list?
May 8, 2025 at 1:00 PM
Here are some probabilistic data structures you must know as a software engineer (not kidding):
They trade accuracy for space efficiency.
They're often used in:
• Databases
• Cache
• Search engines
• Network infrastructure
• Analytics
What else should make this list?
They trade accuracy for space efficiency.
They're often used in:
• Databases
• Cache
• Search engines
• Network infrastructure
• Analytics
What else should make this list?
If you want to reduce latency, learn these 12 rules:
May 5, 2025 at 1:07 PM
If you want to reduce latency, learn these 12 rules:
Give me 2 mins and I'll teach you how DNS works:
May 2, 2025 at 9:45 AM
Give me 2 mins and I'll teach you how DNS works:
Meta achieves 99.99999999% cache consistency.
Here’s how they do it (in 2 minutes):
——
👋 PS - I put together a detailed case study with visuals in my newsletter:
→ newsletter.systemdesign.one/p/cache-cons...
Here’s how they do it (in 2 minutes):
——
👋 PS - I put together a detailed case study with visuals in my newsletter:
→ newsletter.systemdesign.one/p/cache-cons...
April 14, 2025 at 1:14 PM
Meta achieves 99.99999999% cache consistency.
Here’s how they do it (in 2 minutes):
——
👋 PS - I put together a detailed case study with visuals in my newsletter:
→ newsletter.systemdesign.one/p/cache-cons...
Here’s how they do it (in 2 minutes):
——
👋 PS - I put together a detailed case study with visuals in my newsletter:
→ newsletter.systemdesign.one/p/cache-cons...
Give me 2 mins and I'll teach you how Disney+ Hotstar scaled to 25M concurrent users—no fluff:
April 11, 2025 at 2:19 PM
Give me 2 mins and I'll teach you how Disney+ Hotstar scaled to 25M concurrent users—no fluff:
How I’d scale a site to 1 million users—step by step:
April 10, 2025 at 12:05 PM
How I’d scale a site to 1 million users—step by step:
HTTP status codes you must know as a web developer in 2025:
Status codes are 3-digit numbers returned by a server in response to HTTP requests.
It tells the client about the request status and indicates problems if any.
So understanding status codes will help you find site errors quickly.
Status codes are 3-digit numbers returned by a server in response to HTTP requests.
It tells the client about the request status and indicates problems if any.
So understanding status codes will help you find site errors quickly.
April 7, 2025 at 1:19 PM
HTTP status codes you must know as a web developer in 2025:
Status codes are 3-digit numbers returned by a server in response to HTTP requests.
It tells the client about the request status and indicates problems if any.
So understanding status codes will help you find site errors quickly.
Status codes are 3-digit numbers returned by a server in response to HTTP requests.
It tells the client about the request status and indicates problems if any.
So understanding status codes will help you find site errors quickly.
This lady:
• Has no tech background
• Couldn't draw well as a kid
• Knew nothing about venture capitalists
Yet she's worth $5.8 Billion - at 37.
• Has no tech background
• Couldn't draw well as a kid
• Knew nothing about venture capitalists
Yet she's worth $5.8 Billion - at 37.
April 6, 2025 at 12:28 PM
This lady:
• Has no tech background
• Couldn't draw well as a kid
• Knew nothing about venture capitalists
Yet she's worth $5.8 Billion - at 37.
• Has no tech background
• Couldn't draw well as a kid
• Knew nothing about venture capitalists
Yet she's worth $5.8 Billion - at 37.
How to write clean code.
The KYD-DTC Playbook:
The KYD-DTC Playbook:
April 2, 2025 at 1:21 PM
How to write clean code.
The KYD-DTC Playbook:
The KYD-DTC Playbook:
Give me 2 mins and I'll teach you how a database stores passwords securely (not kidding):
April 1, 2025 at 1:10 PM
Give me 2 mins and I'll teach you how a database stores passwords securely (not kidding):
Give me 2 mins and I'll teach you how Amazon S3 (actually) works:
March 29, 2025 at 1:10 PM
Give me 2 mins and I'll teach you how Amazon S3 (actually) works:
I spent hours studying how Apple Pay works, so you don't have to.
Here's what I learned distilled into 9 sentences:
Here's what I learned distilled into 9 sentences:
March 27, 2025 at 1:20 PM
I spent hours studying how Apple Pay works, so you don't have to.
Here's what I learned distilled into 9 sentences:
Here's what I learned distilled into 9 sentences: