Daffe Mouctar

Hope to be a better person❤️🙏

[Spencer Baggins @bigaiguy]

A French engineer who lives quietly in Paris has spent 30 years writing software that the entire internet now runs on without knowing his name.

He wrote the code that streams every YouTube video, every Netflix show, every TikTok clip. He wrote the code that runs the virtual servers underneath AWS, Google Cloud, and Microsoft Azure. He calculated more digits of pi than anyone in history. He has no Twitter. He has no marketing. He just keeps shipping.

His name is Fabrice Bellard.

Here is the story, because almost nobody outside the systems programming world knows what one man has built.

Fabrice was born in 1972 in Grenoble, France. He studied at École Polytechnique, the top French engineering school. He never went to Silicon Valley. He never built a startup empire. He just wrote code.

In 2000 he started a project called FFmpeg, an open-source multimedia framework for encoding, decoding, and streaming video. He was 28. The project did one thing nobody else had done well. It handled every video and audio format that existed, in one library, on every operating system. He led it himself for years.

Today FFmpeg is the invisible engine of the internet. YouTube uses it. Netflix uses it. VLC uses it. Chrome and Firefox use parts of it. Every Android phone, every iPhone, every smart TV, every video editing tool you have ever touched runs FFmpeg somewhere underneath. If you have watched a video on a screen in the last 20 years, Fabrice's code processed it.

He was not done.

In 2003 he started QEMU, a machine emulator and virtualizer. He wrote it solo until version 0.7.1 in 2005. QEMU lets you run any operating system on any other operating system. It became the foundation of modern virtualization. KVM, the Linux kernel hypervisor, runs on top of QEMU. Every major cloud provider, AWS, Google Cloud, Microsoft Azure, IBM Cloud, runs virtual machines on infrastructure built around it. The Quick Emulator is the most cited piece of cloud infrastructure code on Earth.

He kept going.

In 2001 he won the International Obfuscated C Code Contest with a small C compiler that grew into TCC, the Tiny C Compiler. TCC can compile and boot a Linux kernel from source in under 15 seconds. In 2004 he calculated the most digits of pi ever computed at the time, using a personal desktop computer and an algorithm he derived himself called Bellard's formula. In 2011 he wrote a complete PC emulator in pure JavaScript that runs Linux in your browser, a project called JSLinux that engineers still cannot believe is real.

In 2019 he released QuickJS, a small but complete JavaScript engine that fits where V8 cannot. In 2021 he released NNCP, a neural network based lossless data compressor that immediately took the lead on the Large Text Compression Benchmark.

Then he turned his attention to large language models. He built TextSynth Server, a web server with a REST API for running LLMs locally. He released ts_zip and ts_sms, compression utilities that use language models to compress text and short messages at ratios traditional algorithms cannot reach. He released TSAC, a very low bitrate audio compression system. In December 2025 he released Micro QuickJS, a new JavaScript engine for microcontrollers, separate from QuickJS, designed for environments with almost no memory.

Fabrice co-founded a telecom company called Amarisoft in 2012, where he serves as CTO. Amarisoft builds 4G and 5G base station software used by carriers and labs around the world. He has been running it for over a decade while continuing to ship personal projects from his own home page at bellard dot org

He has no Twitter. He has no Instagram. He gives almost no interviews. His personal website is a flat list of projects with no styling, no fonts, no marketing copy. Just titles and links.

A quiet French engineer who never moved to Silicon Valley wrote the code that quietly runs the internet.

He is still shipping.

[Daffe Mouctar @MouctarDaffe]

@misteraliouba WTF, really ?

[Daffe Mouctar @MouctarDaffe]

@blueiscolor99 @misteraliouba https://t.co/yXnv6CSS15

Je crois celle-ci, la dernière fois il avait partagé ça.

[Daffe Mouctar @MouctarDaffe]

Merci d’encourager les étudiants. C’est réconfortant 😊🙏

[Networking Academy @CiscoNetAcad]

You don’t need to know everything today—just start learning.

[Daffe Mouctar @MouctarDaffe]

@misteraliouba Je pensais être le seul 😪. Ce truc est simple et mesquin à la fois je mélange tout le temps

[Daffe Mouctar @MouctarDaffe]

@liam_turner_ai Ready

[Daffe Mouctar @MouctarDaffe]

🤣🤣

[sysxplore @sysxplore]

I will not force my kids to love Linux. They’ll have the freedom to choose between Linux or leaving my house.

[SaxX ¯\_(ツ)_/¯ @_SaxX_]

Quelqu'un va encore sur stackoverflow ?

[Daffe Mouctar @MouctarDaffe]

@Xdinghur @CommeIvoir Si tu le dis chef 🤷‍♂️

[Daffe Mouctar @MouctarDaffe]

@Coraliiie10 J’entends l’excuse de c’est la faute de Perez mais j’y crois pas trop. Il y’a bien pour ça un entraîner et son équipe technique, s’ils ne sont pas capables de dire leurs besoin au président alors c’est plus la peine de recruter ces gens. Que Perez se charge de l’équipe alors.3/3

[Daffe Mouctar @MouctarDaffe]

@Coraliiie10 Parce qu’à ce niveau c’est de l’incompétence ou je ne sais quoi. Il faut avouer qu’aucun de nos milieux n’est bon pour jouer relayeur, soit il n’a pas été formé à ce poste, soit il n’a pas le bagage technique, soit il n’a l’intelligence de jeu ou encore pire les 3. 2/3

[Daffe Mouctar @MouctarDaffe]

@Big_Mz064 Mais est-ce que vous savez que c’est des votes ? C’est comme une élection, celui qui gagne est élu ! Qu’est-ce que le club a à avoir dans ça ?

[Daffe Mouctar @MouctarDaffe]

@luca_varan @LucaVaran Ca m’énerve mais il faut arrêter de dire n’importe quoi. Le club n’a rien à avoir la dedans, c’est les supporters qui votent et basta. Le peut pas contrôler les votes, celui qui gagne est désigné. Bonsoir

[Daffe Mouctar @MouctarDaffe]

@Adammser 🤣c’est tellement vrai

[Daffe Mouctar @MouctarDaffe]

@_forelsket34 @haberiamedya Too true 🤣

[Doudou BA, PhD. @doudou_octopus]

Name: Doudou
From: 🇸🇳
Based: 🇸🇪
Startup: OctOpus
Link: https://t.co/qaaEOd4Zyv
Pitch: OctOpus is an AI that does the actual data science work. Give it data and a goal e.g fine-tune LLM or train ML models and it does it…

What are you building? Use same template- let’s go viral : )

#Startups #Founders #Tech #AI #Unicorn #SilliconValley #SF #Stockholm

[Microsoft Learn @MicrosoftLearn]

Do one thing your future self will thank you for: start that certification course.

[Daffe Mouctar @MouctarDaffe]

@Coraliiie10 Oui je suis d’accord aussi, c’est mieux, et il faudra arrêter de toujours se trouver des excuses et faire mieux, c’est obligé