Mohamed SAID

Lead Software Engineer
Weekender Surfer
Mentalism Lover

[Tom Dörr @tom_doerr]

Turns Claude into a specialized reconnaissance operator

https://t.co/8HknvW6sTm

[Neo Kim @systemdesignone]

If you want to become a world-class software engineer, learn these 19 system design case studies:

1 How Stock Exchange Works:
↳ https://t.co/iFNSX9TM9O

2 How Payment System Works:
�� https://t.co/ARiLxGR43G

3 How YouTube Works:
↳ https://t.co/kHk3g6jz6t

4 How Google Docs Works:
↳ https://t.co/W57IkAjXpT

5 How Kafka Works:
↳ https://t.co/8rOy9KgCMo

6 How Pastebin Works:
↳ https://t.co/8NSUNlYM7q

7 How WhatsApp Works:
↳ https://t.co/VScq8QwHMr

8 How Airbnb Works:
↳ https://t.co/Bi5SAjfv5S

9 How Spotify Works:
↳ https://t.co/BxrH3oHIFS

10 How Slack Works:
↳ https://t.co/eIo29uOQOJ

11 How Reddit Works:
↳ https://t.co/o6Pw2hhj3T

12 How Google Search Works:
↳ https://t.co/jwOaC4bhnv

13 How Real-Time Leaderboard Works:
↳ https://t.co/HEChNTOHWb

14 How Twitter Works:
↳ https://t.co/pF2RYmPaIG

15 How Uber Computes ETA:
↳ https://t.co/hw1hYJqQmj

16 How Amazon Lambda Works:
↳ https://t.co/lx0BjeSRZt

17 How Amazon S3 Works:
↳ https://t.co/iReWAEHwmj

18 How Do AirTags Work:
↳ https://t.co/upWcgsXwKh

19 How ChatGPT Works:
↳ https://t.co/5lCKxq2g4N

What else should make this list?

——

👋 PS - Want my System Design Playbook (for FREE)?

Join my newsletter with 200K+ software engineers right now:

→ https://t.co/ByOFTtOihX

———

💾 Save this for later & RT to help others become good at system design.

👤 Follow @systemdesignone + turn on notifications.

[Akshay 🚀 @akshay_pachaar]

How to setup your Claude code project?

TL;DR

Most developers skip the setup and just start prompting. That's the mistake.

A proper Claude Code project lives inside a .𝗰𝗹𝗮𝘂𝗱𝗲/ folder. Start with 𝗖𝗟𝗔𝗨𝗗𝗘.𝗺𝗱 as Claude's instruction manual. Split it into a 𝗿𝘂𝗹𝗲𝘀/ folder as it grows. Add 𝗰𝗼𝗺𝗺𝗮𝗻𝗱𝘀/ for repeatable workflows, 𝘀𝗸𝗶𝗹𝗹𝘀/ for context-triggered automation, and 𝗮𝗴𝗲𝗻𝘁𝘀/ for isolated subagents. Lock down permissions in 𝘀𝗲𝘁𝘁𝗶𝗻𝗴𝘀.𝗷𝘀𝗼𝗻.

There are two .𝗰𝗹𝗮𝘂𝗱𝗲/ folders: one committed with your repo, one global at ~/.𝗰𝗹𝗮𝘂𝗱𝗲/ for personal preferences and auto-memory across projects.

The .𝗰𝗹𝗮𝘂𝗱𝗲/ folder is infrastructure. Treat it like one.

The article below is a complete guide to 𝗖𝗟𝗔𝗨𝗗𝗘.𝗺𝗱, custom commands, skills, agents, and permissions, and how to set them up properly.

[Fernando @Franc0Fernand0]

Awesome CTO

A great github repo full of resources for software engineers and aspiring CTOs:

- Software Development Processes
- Hiring for technical roles
- Software Architecture
- Product and Project Management
- Career growth

Check it here:

https://t.co/2l1aCAqv2c

[Raul Junco @RaulJuncoV]

Most engineers overcomplicate locking.

Here’s the truth:

Optimistic Lock → Application-level control
Pessimistic Lock → Database-level control

Optimistic = let everyone edit, check for conflicts on save.
(Think Google Docs.)

Pessimistic = block everyone else until you’re done.
(Think library book.)

Rule of thumb

If retry is cheap → use Optimistic
If retry is expensive → use Pessimistic

[javinpaul @javinpaul]

I have created a GitHub repository to help you learn system design.

And it received 2850+ stars on GitHub

It gives you:
- System design interview tips
- System design fundamentals
- resources

repo - https://t.co/40koHrIZ4Y

[javinpaul @javinpaul]

10 Best System Design Topics Developers Should Learn in 2025
1. Caching
2. Sharding
3. load-balancing
4. replication
5. fault-tolerance
6. high-availability
7. Concurrency
8. scalability
9. Performance
10. Indexing
learn more on DesignGuru - https://t.co/VuZLWnBFWY

[Mushtaq Bilal, PhD @MushtaqBilalPhD]

Libgen, Sci-Hub, and Z-library had millions of pirated academic books and papers.

So, they were shut down. We shouldn't use them anyway.

We should help billion-dollar academic publishers get richer.

Anyway, here's how to access these libraries:

Don't do this!

[Gunter Rotsaert @mydevlprplanet]

When you pull a Docker image, you will notice that it is pulled as different layers. In this post you will get a better understanding of Docker layers.
#docker
https://t.co/Bl906mc6O7

[Mohamed SAID @D4rkCmd]

Finally ...

[GraalVM @graalvm]

Oracle GraalVM container images are now available in Oracle Container Registry!🚀
You can now easily pull Oracle GraalVM container images for building and deploying fast and lightweight Java applications.
Learn more and get started: https://t.co/MFMvs3OkXi

[Mario Fusco @mariofusco]

That's why I reserve the hardest and most complex tasks for the days when I work from home. And also why I feel exhausted at end of one of those days.

[Mohamed SAID @D4rkCmd]

@lvdhoek @mariofusco Fact

[Sahil Bloom @SahilBloom]

Researchers studied the impact of meetings on our brains.

This is fascinating…

[Bytebytego @bytebytego]

How to design a 𝐬𝐞𝐜𝐮𝐫𝐞 web API access for your website?

For weekly tips on system design, subscribe to our newsletter: https://t.co/Grlkpq6I3j

[Oded Shopen @odedia]

Check out my latest article: "Production Considerations for Spring on Kubernetes"
https://t.co/PSg0MJu2mi
#spring #springboot #kubernetes #java #devops

[javinpaul @javinpaul]

System Design Questions
1. URL Shortner - https://t.co/LuBDsnRfNW
2. Youtube Design - https://t.co/vVxyRjMtHC
3. Design an LMS - https://t.co/Bp1LdUFdBm
4. WhatsApp - https://t.co/kmXFPpw3DI
5. Parking Lot - https://t.co/yQ6r3jBy9S
6. Instagram Design - https://t.co/n6j5ITtijE

[Mohamed SAID @D4rkCmd]

#Apple #AirTags #Hacked And Cloned With Voltage Glitching:
https://t.co/GFwvuZ8S8e

[Mohamed SAID @D4rkCmd]

@rapmarocainoff1 TEEKAY The beat is fire 🔥🔥

[Mohamed SAID @D4rkCmd]

Faaaaaact

[Nitesh kumar @Its_nitesh_45]

#facebookdown #instagramdown
Me running to Twitter to confirm that I am not the only one having issues with Facebook and Instagram, whatsapp.

[WhatsApp @WhatsApp]

We’re aware that some people are experiencing issues with WhatsApp at the moment. We’re working to get things back to normal and will send an update here as soon as possible.

Thanks for your patience!