Alex Xu (@alexxubyte) / X

Alex Xu

5,142 posts

Alex Xu

@alexxubyte

Co-Founder of ByteByteGo | Author of the bestselling book series: ‘System Design Interview’ | YouTube: youtube.com/@ByteByteGo

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Joined July 2010

Alex Xu
@alexxubyte
Sep 21, 2022
/1 How do Apple Pay and Google Pay handle sensitive card info? The diagram below shows the differences. Both approaches are very secure, but the implementations are different. To understand the difference, we break down the process into two flows.
Alex Xu
@alexxubyte
Nov 19, 2022
Twitter Architecture 2022 vs. 2012. What’s changed over the past 10 years? Thank you, @elonmusk for the transparency. {1/2}
Alex Xu
@alexxubyte
Oct 2, 2023
Explaining 8 Popular Network Protocols in 1 Diagram. The method to download the high-resolution PDF is available at the end. Network protocols are standard methods of transferring data between two computers in a network. 1. HTTP (HyperText Transfer Protocol) HTTP is a protocol
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Alex Xu
@alexxubyte
Aug 11, 2022
/1 Why is the credit card called “𝐭𝐡𝐞 𝐦𝐨𝐬𝐭 𝐩𝐫𝐨𝐟𝐢𝐭𝐚𝐛𝐥𝐞 product in banks”? How does VISA/Mastercard make money? The diagram below shows the economics of the credit card payment flow. 1. The cardholder pays a merchant $100 to buy a product.
Alex Xu
@alexxubyte
Mar 8, 2023
/1 Want to know the secret to optimizing your SQL queries? Understanding the execution order is key.
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Alex Xu
@alexxubyte
Sep 22, 2022
1/ The Unified Payments Interface (UPI) for real-time transactions in India is a good case study for other nations in the payment space.
Alex Xu
@alexxubyte
Sep 12, 2022
/1 𝐖𝐡𝐚𝐭 𝐀𝐫𝐞 𝐭𝐡𝐞 𝐆𝐫𝐞𝐞𝐧𝐞𝐬𝐭 𝐏𝐫𝐨𝐠𝐫𝐚𝐦𝐦𝐢𝐧𝐠 𝐋𝐚𝐧𝐠𝐮𝐚𝐠𝐞𝐬 [1]? The study below runs 10 benchmark problems in 28 languages. It measures the runtime, memory usage, and energy consumption of each language. The abstract of the paper is shown below.
Alex Xu
@alexxubyte
Dec 27, 2022
/1 Why is a credit card called a “𝐜𝐫𝐞𝐝𝐢𝐭” card? Why is a debit card called a “𝐝𝐞𝐛𝐢𝐭” card? An example of a debit card payment is shown in the diagram below. 👇
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Alex Xu
@alexxubyte
Dec 28, 2024
The 9 Algorithms That Dominate Our World
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Alex Xu
@alexxubyte
Oct 10, 2023
How do companies ship code to production? The method to download the high-resolution PDF is available at the end. The diagram below illustrates the typical workflow. Step 1: The process starts with a product owner creating user stories based on requirements. Step 2: The dev
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Alex Xu
@alexxubyte
Jan 13, 2023
Really cool neovim plugin. I hope everyone takes a break from coding and has a great weekend. Github repo: github.com/Eandrju/cellul…
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Alex Xu
@alexxubyte
Sep 11, 2023
My recommended materials for cracking your next technical interview: Coding - Leetcode - Cracking the coding interview book - Neetcode System Design Interview - System Design Interview book 1, 2 by Alex Xu - Grokking the system design by Design Guru - Design Data-intensive
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Alex Xu
@alexxubyte
Oct 5, 2022
/1 How will you design the Stack Overflow website? If your answer is on-premise servers and monolith (bottom), you would likely fail the interview, but that's how it is built in reality!
Alex Xu
@alexxubyte
Jun 20, 2022
Would it be nice if the code we wrote automatically turned into architecture diagrams? I recently discovered a Github repo that does exactly this: Diagram as Code for prototyping cloud system architectures.