Neo Kim

22 Jan 2025

Give me 2 minutes, and I'll teach you how @bsky.app works (not joking):

8 May 2025

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?

5 May 2025

If you want to reduce latency, learn these 12 rules:

2 May 2025

Give me 2 mins and I'll teach you how DNS works:

newsletter.systemdesign.oneHow DNS Works 🔥#70: Distributed Hierarchical Database for 5.35B Users (2 Minutes)

2 May 2025

👋 PS - I wrote a more detailed article about DNS in my newsletter (with visuals): → newsletter.systemdesign.one/p/what-is-a-dns-server-and-how-does-it-work

14 Apr 2025

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...

11 Apr 2025

Give me 2 mins and I'll teach you how Disney+ Hotstar scaled to 25M concurrent users—no fluff:

10 Apr 2025

How I’d scale a site to 1 million users—step by step:

7 Apr 2025

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.

6 Apr 2025

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.

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.

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.

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.

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.

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.

I'm Type 3 and You?

How to write clean code. The KYD-DTC Playbook:

1 Apr 2025

Give me 2 mins and I'll teach you how a database stores passwords securely (not kidding):

29 Mar 2025

Give me 2 mins and I'll teach you how Amazon S3 (actually) works:

27 Mar 2025

I spent hours studying how Apple Pay works, so you don't have to. Here's what I learned distilled into 9 sentences:

newsletter.systemdesign.oneHow Apple Pay Handles 41 Million Transactions a Day Securely 💸#68: Break Into Apple Pay Architecture (5 Minutes)

27 Mar 2025

👋 PS - I wrote an article with visuals about this case study in my newsletter: → newsletter.systemdesign.one/p/how-does-a...

24 Mar 2025

Popular apps and open-source alternatives: What else should make this list? • Microsoft Office → Libre Office • WhatsApp → Signal • Google Chrome → Mozilla Firefox • Adobe Photoshop → Krita • Google → DuckDuckGo • Windows / Mac → GNU Linux

24 Mar 2025

• Google Drive → Nextcloud • Microsoft Outlook → Thunderbird • LastPass → KeePass • YouTube → PeerTube • Adobe Premiere Pro → Kdenlive • Visual Studio → Vim • Trello → Taiga • Evernote → Joplin

23 Mar 2025

Give me 2 minutes and I'll teach you how YouTube supports 2.49 billion users with MySQL (not kidding):

22 Mar 2025

I spent hours studying how Amazon S3 achieves 99.999999999% durability — because S3 is the new norm. Here's what I learned distilled into 12 sentences (not kidding):

21 Mar 2025

Git has 152 commands. But most people don't know the powerful ones. Here are the 4 must learn Git commands (bookmark this):

20 Mar 2025

Give me 2 minutes, and I'll teach you how Uber computes ETA (not kidding):

19 Mar 2025

I spent hours studying how Amazon Lambda works — because Serverless is the new norm. Here's what I learned distilled into 11 sentences (you'll thank me later):

newsletter.systemdesign.oneThe System Design Newsletter | Neo Kim | SubstackWeekly newsletter to help you become good at work. Click to read The System Design Newsletter, by Neo Kim, a Substack publication with hundreds of thousands of subscribers.

If you want to become good at system design (I'm not joking), learn these case studies:

👋 PS - Join 100,000 and get the powerful system design template (it's free): → newsletter.systemdesign.one

♻ Repost to help others learn system design ➕ Follow @systemdesign.one

If you want to become good at system design (I'm not joking), learn these case studies:

11 How Tinder Scaled to 1.6 Billion Swipes per Day ↳ newsletter.systemdesign.one/p/tinder-arc... 12 URL Shortener System Design ↳ systemdesign.one/url-shorteni...

13 How Zoom Works ↳ newsletter.systemdesign.one/p/zoom-archi... 14 How Meta Achieves 99.99999999% Cache Consistency ↳ newsletter.systemdesign.one/p/cache-cons... 15 How to Scale an App to 10 Million Users on AWS ↳ newsletter.systemdesign.one/p/aws-scale

If you want to become good at system design (I'm not joking), learn these case studies:

7 How Cloudflare Handles 55 Million RPS With Only 15 Postgres Clusters ↳ newsletter.systemdesign.one/p/postgresql... 8 Slack System Design ↳ systemdesign.one/slack-archit...

9 Distributed Counter Architecture ↳ systemdesign.one/distributed-... 10 Pastebin System Design ↳ systemdesign.one/system-desig...