Jean Deruelle

Founder @soleur_ai
Ex Head of Engineering @osmosis @Polaris_App.
Ex Co-founder and CTO @Telestax.
Ex- @RedHat.

Musings & Observations about life

[Jean Deruelle @deruelle]

@alvaro__data Congratulations to the entire team for this milestone 👏🎉

[Alvaro @alvaro__data]

YC launched ObsessionDB today. We're in the F26 batch.

If you self-host ClickHouse®, one node stops being enough, or it dies and you spend hours restoring from backup. Managed providers quiet the pager, then the bill climbs faster than your data.

We keep the data in S3 and scale compute separately. Customers who moved cut their bill by 40%, and their queries got faster.

https://t.co/JWNeOSINYl

[BreizhCamp @breizhcamp]

Les replays du BreizhCamp 2026 sont enfin disponibles 🎥
Un grand merci à notre partenaire CYIM pour la captation vidéo 🙏
🎬 https://t.co/M9Rc8EbnXB

Retrouvez l'article de blog concernant la publication des replays sur notre site : https://t.co/TueSvOujfN

[Roman @akhtariev]

Interesting fact: as of today, this is powered by the most efficient and practical PIR scheme.

Under the hood, there is a ciphertext compression mechanism called packing.

A paper came out a month ago that optimized the packing throughput by 5x compared to the prior state of the art. It’s called ReInsPIRe.

The buffer introduced by the speed up has allowed us to reduce parameters controlling decryption correctness. The security parameters stay the same.

With more room for noise, we applied a number of tricks such as rounding encryption at the client/server boundaries, which reduced total bandwidth.

There are also GPUs involved for the matrix-vector multiplication of the database by the client query.

The results are sub 200KB total per-query bandwidth and sub 50ms server time on a 1.88 GB database.

The wallet PIR databases are sharded into chunks of under 500 MB. So, in production, the server time and bandwidth are even smaller.

[Mistral AI @MistralAI]

Meet Mistral Large 4, aka Le Chonk.

• 1T parameters, natively multimodal. 49B active.
It is the best open weights model from US or Europe on aggregated benchmarks.
• State-of-the-art on critical workloads, including cyber defense, manufacturing and finance and it surpasses closed frontier models on visual grounding.
• Forged in Europe end-to-end and is deployable from Europe via our own Mistral Cloud infrastructure.
• Available to all via API today. Working with cybersecurity partners privately.

Open weights release end of October.

[josh lee @dogemos]

Honored to be speaking at Zcash Zummit on building a Zcash wallet that requires zero knowledge about zero knowledge.

See you at the Network State Conference!

[Dev @zkDragon]

Zakura v1.5.1 is out!

A small, fun thing in there: it 4x speeds up equihash CPU mining, and 2.5x speeds up equihash verification!

Switch to Zakura to get the best speeds!

[Dev @zkDragon]

Wow 2.8ms block processing times.

Speed era 🏃‍♂️

[Emmanuel Bernard @emmanuelbernard]

The stealth company I co-founded has a name: Hadronic. Java has a strong future, AI and agents are here to stay, and the best way to predict this future is to invent it. Why, and who we are hiring: https://t.co/pI576OqzvC

[Jean Deruelle @deruelle]

@DominickSGerard @Starlink @OmarchyLinux @dhh Thanks for this!

[Dom @DominickSGerard]

My unofficial Starlink plugin is officially listed on the Omarchy Plugin Marketplace. Check it out if you have Starlink and want to keep track of your @Starlink stats in real-time on @OmarchyLinux. Thanks, again @dhh for the awesome OS!

https://t.co/AiO82l9ZaQ

[Dev @zkDragon]

Shielded Ledger txs getting 2x faster soon 👀

ty to @adamleetucker17

https://t.co/T5bhklQZsq

[Charles Guillemet @P3b7_]

🛡️🛡️🛡️Shielded Zcash transactions are now available in Ledger Wallet desktop 🛡️🛡️🛡️

I personally committed to this one. It took far longer than I expected, but it is now delivered, and that is what matters.

Privacy here is not a server setting. To keep your shielded balance private, the scanning and the transaction building happen on your machine: your unified viewing key is stored locally and is never shared with anyone, including us. That is exactly what made the integration trickier.

When it comes to signing the TX, the ZKP is computed on your machine (it's much faster with Ironwood now 🚀), and then the transaction is signed on your device, on a screen you can trust.

Make sure your Ledger Wallet Desktop and Zcash app are up-to-date, and you're good to interact with Ironwood!

Privacy is normal ✊

Stay safe.

[Oleg Agafonov @agaf0x]

I’m still looking for my next opportunity 👋

Primarily interested in CTO, Head of Engineering, Tech Lead, Engineering Manager or Architect roles in DeFi, crypto, trading, stablecoins/payments or fintech.

If you’re building something interesting, let’s talk 🙏

[Jean Deruelle @deruelle]

@moggia @OmarchyLinux Dope @moggia !!! Crazy after all this time to still be tinkering on the same things 😁

[Jean Deruelle @deruelle]

Just installed @OmarchyLinux after spending 20y on Ubuntu/Fedora. Dual booted alongside Ubuntu and still migrating my workloads and setup but it's now my primary OS. I'd recommend anyone running Linux to try it out. It's been a breeze of fresh air with loads of little things making the experience amazing out of the box! Thanks @dhh and team for the work on this!

[Jean Deruelle @deruelle]

@zkDragon This is a huge unlock IMO. Congrats @vizorwallet team!

[Dev @zkDragon]

Shielded ledger support is live for Zcash!!!

[josh lee @dogemos]

@mert

[mert @mert]

huge

one of the biggest things missing from zec has been ledger not having shielded zec support

with this, the shielded pool will go up in size, which will increase total anonymity, which will reduce risk for larger and larger deposits

trillions