Sylvain Wallez
@swallez.com
Software engineer, from big servers to tiny microcontrollers. Member of @apache.org, working at @rerun.io, ex-Elastic. Blogging (sometimes) at https://bluxte.net
🌐 Toulouse, France, Europe
🌐 Toulouse, France, Europe
Reposted by Sylvain Wallez
System design 101 (or even before): never use the email as the PK for a user account. What if the user needs to change their email?
Better make it a regular column with a UNIQUE constraint.
Better make it a regular column with a UNIQUE constraint.
December 29, 2025 at 3:00 PM
System design 101 (or even before): never use the email as the PK for a user account. What if the user needs to change their email?
Better make it a regular column with a UNIQUE constraint.
Better make it a regular column with a UNIQUE constraint.
Reposted by Sylvain Wallez
Binaires au delà de 25GiB et le principe de "Relocation Barrier". Très intéressant.
fzakaria.com/2025/12/28/h... (cc @ponceto91.bsky.social et @imil.net)
fzakaria.com/2025/12/28/h... (cc @ponceto91.bsky.social et @imil.net)
Huge binaries
A problem I experienced when pursuing my PhD and submitting academic articles was that I had built solutions to problems that required dramatic scale to be effective and worthwhile. Responses to my pu...
fzakaria.com
December 29, 2025 at 6:21 AM
Binaires au delà de 25GiB et le principe de "Relocation Barrier". Très intéressant.
fzakaria.com/2025/12/28/h... (cc @ponceto91.bsky.social et @imil.net)
fzakaria.com/2025/12/28/h... (cc @ponceto91.bsky.social et @imil.net)
Reposted by Sylvain Wallez
The Advent of Compiler Optimisation 2025.
Matt Godbolt, le créateur de compiler explorer, nous partage 25 tricks utilisés par les compilateurs. Passionnant ⬇️
xania.org/AoCO2025-arc...
Matt Godbolt, le créateur de compiler explorer, nous partage 25 tricks utilisés par les compilateurs. Passionnant ⬇️
xania.org/AoCO2025-arc...
AoCO2025 Archive — Matt Godbolt’s blog
xania.org
December 28, 2025 at 9:49 AM
The Advent of Compiler Optimisation 2025.
Matt Godbolt, le créateur de compiler explorer, nous partage 25 tricks utilisés par les compilateurs. Passionnant ⬇️
xania.org/AoCO2025-arc...
Matt Godbolt, le créateur de compiler explorer, nous partage 25 tricks utilisés par les compilateurs. Passionnant ⬇️
xania.org/AoCO2025-arc...
Tu sais que tu es revenu à Toulouse quand tu entends tous les passagers dire "merci, au revoir" au chauffeur en descendant du bus. #Toulouse
December 27, 2025 at 2:34 PM
Tu sais que tu es revenu à Toulouse quand tu entends tous les passagers dire "merci, au revoir" au chauffeur en descendant du bus. #Toulouse
Current status: experimenting with Apache Arrow's C Data Interface to do heavy calculation in Rust from a Java program with zero overhead (testing both JNI and FFM). The Rust and Java implementations handle automatic memory reclamation very nicely! I keep being impressed by the Arrow ecosystem.
The Arrow C data interface — Apache Arrow v22.0.0
arrow.apache.org
December 27, 2025 at 1:37 PM
Current status: experimenting with Apache Arrow's C Data Interface to do heavy calculation in Rust from a Java program with zero overhead (testing both JNI and FFM). The Rust and Java implementations handle automatic memory reclamation very nicely! I keep being impressed by the Arrow ecosystem.
"A startup can ship fast and break things for a time, but eventually someone has to pay the bill. Usually it's the maintainers, the ones who arrive after the Hero Developers have departed for greener pastures, the ones left to untangle spaghetti code" www.joanwestenberg.com/the-rime-of-...
The Rime of the Ancient Maintainer
Every culture produces heroes that reflect its deepest anxieties. The Greeks, terrified of both mortality and immortality, gave us Achilles. The Victorians, haunted by social mobility, gave us the sel...
www.joanwestenberg.com
December 27, 2025 at 8:37 AM
"A startup can ship fast and break things for a time, but eventually someone has to pay the bill. Usually it's the maintainers, the ones who arrive after the Hero Developers have departed for greener pastures, the ones left to untangle spaghetti code" www.joanwestenberg.com/the-rime-of-...
Reposted by Sylvain Wallez
As a consultant I highly endorse the og post, you might not like it but this is what peak job security looks like
Can't wait for the loosened up, non-perfect, but quickly shipped AI-enhanced updates to hit my banking and insurance services next year.
Im sure there will be no issues there at all.
Im sure there will be no issues there at all.
December 26, 2025 at 5:56 PM
As a consultant I highly endorse the og post, you might not like it but this is what peak job security looks like
Reposted by Sylvain Wallez
𝗠𝘆 𝗟𝗶𝘁𝘁𝗹𝗲 𝗔𝗿𝗿𝗮𝗻𝗴𝗲𝗺𝗲𝗻𝘁𝘀 𝘄𝗶𝘁𝗵 𝗖𝗹𝗮𝘂𝗱𝗲 𝗖𝗼𝗱𝗲
I've been working for a few weeks on a Go library for coding AI agents (it's kind of the result of 2+ years of experimentation).
I've been working for a few weeks on a Go library for coding AI agents (it's kind of the result of 2+ years of experimentation).
December 26, 2025 at 2:54 PM
𝗠𝘆 𝗟𝗶𝘁𝘁𝗹𝗲 𝗔𝗿𝗿𝗮𝗻𝗴𝗲𝗺𝗲𝗻𝘁𝘀 𝘄𝗶𝘁𝗵 𝗖𝗹𝗮𝘂𝗱𝗲 𝗖𝗼𝗱𝗲
I've been working for a few weeks on a Go library for coding AI agents (it's kind of the result of 2+ years of experimentation).
I've been working for a few weeks on a Go library for coding AI agents (it's kind of the result of 2+ years of experimentation).
I discovered @marcggauthier.bsky.social's blog today. And it's really a collection of gems on engineering team organization and management that will lead you to think about your organization, team dynamics, and of course yourself. The book review section is also worth looking at. marcgg.com/blog/
Marc G Gauthier - Blog
Blog with articles about ruby, management, startups, teaching, javascript, philosophy and more.
marcgg.com
December 24, 2025 at 8:12 AM
I discovered @marcggauthier.bsky.social's blog today. And it's really a collection of gems on engineering team organization and management that will lead you to think about your organization, team dynamics, and of course yourself. The book review section is also worth looking at. marcgg.com/blog/
Reposted by Sylvain Wallez
Very good article that shows the limitations of each organizational structure (silo, squad, core team, etc.). It ends an overly optimistic note with the introduction of staff eng.
(I know by experience that the story does not end with the last chapter... unfortunately).
marcgg.com/blog/2025/11...
(I know by experience that the story does not end with the last chapter... unfortunately).
marcgg.com/blog/2025/11...
Startup Engineering Team Organisation
Pros and cons of various team structures for startups.
marcgg.com
December 23, 2025 at 2:39 PM
Very good article that shows the limitations of each organizational structure (silo, squad, core team, etc.). It ends an overly optimistic note with the introduction of staff eng.
(I know by experience that the story does not end with the last chapter... unfortunately).
marcgg.com/blog/2025/11...
(I know by experience that the story does not end with the last chapter... unfortunately).
marcgg.com/blog/2025/11...
Reposted by Sylvain Wallez
Many people want to be managers to grow their careers but in reality being a leader is more important in the long run. A leader is someone whose authority is earned and people choose to follow as opposed to someone people have to follow because it’s their job.
Good leaders are…
Good leaders are…
December 22, 2025 at 5:30 PM
Many people want to be managers to grow their careers but in reality being a leader is more important in the long run. A leader is someone whose authority is earned and people choose to follow as opposed to someone people have to follow because it’s their job.
Good leaders are…
Good leaders are…
Reposted by Sylvain Wallez
Mesdames et Messieurs, ceci est un message de haute importance, nous arrivons en période de Noël, période de retrouvaille en famille, de discussions autour d'un bon repas. Cette période est très importante. Soyez ferme: Quoiqu'il arrive : VOUS NE SAVEZ PAS DÉPANNER UNE IMPRIMANTE !
December 8, 2025 at 2:19 PM
Mesdames et Messieurs, ceci est un message de haute importance, nous arrivons en période de Noël, période de retrouvaille en famille, de discussions autour d'un bon repas. Cette période est très importante. Soyez ferme: Quoiqu'il arrive : VOUS NE SAVEZ PAS DÉPANNER UNE IMPRIMANTE !
Reposted by Sylvain Wallez
En ce moment je contacte des gens qui ont un blog pour comprendre leur process d'écriture, plateforme idéale etc...
Je construis une alternative européenne à medium, substack etc... Si ca vous dit de tester, ou juste discuter de ce que vous aimeriez trouver ou pas ne pas trouver. N'hésitez pas :)
Je construis une alternative européenne à medium, substack etc... Si ca vous dit de tester, ou juste discuter de ce que vous aimeriez trouver ou pas ne pas trouver. N'hésitez pas :)
December 21, 2025 at 2:02 PM
En ce moment je contacte des gens qui ont un blog pour comprendre leur process d'écriture, plateforme idéale etc...
Je construis une alternative européenne à medium, substack etc... Si ca vous dit de tester, ou juste discuter de ce que vous aimeriez trouver ou pas ne pas trouver. N'hésitez pas :)
Je construis une alternative européenne à medium, substack etc... Si ca vous dit de tester, ou juste discuter de ce que vous aimeriez trouver ou pas ne pas trouver. N'hésitez pas :)
Weekend rangement à la maison : on a encore des cassettes VHS et des DVD de films qu'on trouve facilement sur les internets (et en bien meilleure qualité). Vous en feriez quoi à part des funérailles à la déchetterie ?
December 21, 2025 at 9:57 AM
Weekend rangement à la maison : on a encore des cassettes VHS et des DVD de films qu'on trouve facilement sur les internets (et en bien meilleure qualité). Vous en feriez quoi à part des funérailles à la déchetterie ?
Anna's Archive has archived most of Spotify 🤯 annas-archive.org/blog/backing...
Backing up Spotify
We backed up Spotify (metadata and music files). It’s distributed in bulk torrents (~300TB). It’s the world’s first “preservation archive” for music which is fully open (meaning it can easily be mirro...
annas-archive.org
December 21, 2025 at 8:45 AM
Anna's Archive has archived most of Spotify 🤯 annas-archive.org/blog/backing...
"Disagree and commit": we can do better. duncan.dev/post/beyond-...
Beyond disagree and commit
Before you disagree and commit, get curious. A mental model for turning zero-sum arguments into positive-sum understanding.
duncan.dev
December 21, 2025 at 8:41 AM
"Disagree and commit": we can do better. duncan.dev/post/beyond-...
Reposted by Sylvain Wallez
Ma conf « Veille technologique : ma méthode pour rester à jour », donnée au @devfesttoulouse.fr, est dispo.
RSS, zéro algo, zéro FOMO, agrégateurs, filtres, rituels…
Une méthode pragmatique pour une veille qui sert vraiment.
www.youtube.com/watch?v=d8nL...
RSS, zéro algo, zéro FOMO, agrégateurs, filtres, rituels…
Une méthode pragmatique pour une veille qui sert vraiment.
www.youtube.com/watch?v=d8nL...
Veille technologique ma méthode pour rester à jour
YouTube video by GDG France
www.youtube.com
December 19, 2025 at 2:18 PM
Ma conf « Veille technologique : ma méthode pour rester à jour », donnée au @devfesttoulouse.fr, est dispo.
RSS, zéro algo, zéro FOMO, agrégateurs, filtres, rituels…
Une méthode pragmatique pour une veille qui sert vraiment.
www.youtube.com/watch?v=d8nL...
RSS, zéro algo, zéro FOMO, agrégateurs, filtres, rituels…
Une méthode pragmatique pour une veille qui sert vraiment.
www.youtube.com/watch?v=d8nL...
Reposted by Sylvain Wallez
Merci à l'équipe, discussion très sympa entre passionnés !
[𝗠𝗔𝗖𝗜] Java continue d’évoluer !
Dans ce MACI #149, on explore ce que changent Java 22→25 pour les développeurs : perf, API modernes et nouvelles façons de structurer son code.
🎙️ @josepaumard.bsky.social, @lostinbrittany.bsky.social, A. Hébert, T. Mazé
youtu.be/9B8apP6R76Y
Dans ce MACI #149, on explore ce que changent Java 22→25 pour les développeurs : perf, API modernes et nouvelles façons de structurer son code.
🎙️ @josepaumard.bsky.social, @lostinbrittany.bsky.social, A. Hébert, T. Mazé
youtu.be/9B8apP6R76Y
December 19, 2025 at 1:02 PM
Merci à l'équipe, discussion très sympa entre passionnés !
Reposted by Sylvain Wallez
Ça vient d'ouvrir ! Ils avaient planqué l'adresse jusque-là, on savait juste que c'est à Arcueil, RER Laplace. J'irai dès que possible. museedujeuvideo.org/fr
Le musée du jeu vidéo
Préserver, comprendre, transmettre : l'héritage du jeu vidéo
museedujeuvideo.org
December 19, 2025 at 11:13 AM
Ça vient d'ouvrir ! Ils avaient planqué l'adresse jusque-là, on savait juste que c'est à Arcueil, RER Laplace. J'irai dès que possible. museedujeuvideo.org/fr
La dérive des enquêtes de satisfaction : une note sur 10, mais si c'est pas 9 ou 10, alors il y a un problème. Du coup on affiche par tiers, avec 1 à 6 tassés dans le premier. Et si on mettait juste "pas content, neutre, content" ? Ou même, soyons fous, et si on arrêtait de nous emmerder avec ça ?
December 18, 2025 at 5:34 PM
La dérive des enquêtes de satisfaction : une note sur 10, mais si c'est pas 9 ou 10, alors il y a un problème. Du coup on affiche par tiers, avec 1 à 6 tassés dans le premier. Et si on mettait juste "pas content, neutre, content" ? Ou même, soyons fous, et si on arrêtait de nous emmerder avec ça ?
My former team at Elastic is hiring a .Net developer to work on client libraries and integrations with the .Net ecosystem. Great job, full remote, all in the open!
Want to work at a fully remote company doing #opensource #dotnet ?
Unique opportunity to join Elastic's Dev Tools team!
jobs.elastic.co/jobs/enginee...
Unique opportunity to join Elastic's Dev Tools team!
jobs.elastic.co/jobs/enginee...
Search - Developer Tooling - C#/.NET Senior Software Engineer
Elastic, the Search AI Company, enables everyone to find the answers they need in real time, using all their data, at scale — unleashing the potential of businesses and people. The Elastic Search AI P...
jobs.elastic.co
December 18, 2025 at 7:25 AM
My former team at Elastic is hiring a .Net developer to work on client libraries and integrations with the .Net ecosystem. Great job, full remote, all in the open!
Reposted by Sylvain Wallez
How have servers and the cloud evolved in the last 30 years, and what might be next? @bcantrill.bsky.social has been at the thick of the industry since the Dotcom Boom, and shares fascinating stories.
Bryan is one of my all-time favorite people to talk with - don't miss this one.
(cont'd)
Bryan is one of my all-time favorite people to talk with - don't miss this one.
(cont'd)
December 17, 2025 at 9:02 PM
How have servers and the cloud evolved in the last 30 years, and what might be next? @bcantrill.bsky.social has been at the thick of the industry since the Dotcom Boom, and shares fascinating stories.
Bryan is one of my all-time favorite people to talk with - don't miss this one.
(cont'd)
Bryan is one of my all-time favorite people to talk with - don't miss this one.
(cont'd)
Reposted by Sylvain Wallez
Our friends on the Music Assistant team have released their latest hit: Music Assistant 2.7! 💃🏻
They've jazzed up the UI & UX with a chart-topping lineup of new features & providers, and introduce a new streaming protocol they're spinning up! 💿 Catch up on all that's new 👇🏼
They've jazzed up the UI & UX with a chart-topping lineup of new features & providers, and introduce a new streaming protocol they're spinning up! 💿 Catch up on all that's new 👇🏼
Music Assistant 2.7 - Taking over the airwaves
With a visual overhaul, new features and providers, and a custom-built streaming protocol, it's our biggest update yet!
www.home-assistant.io
December 17, 2025 at 10:00 PM
Our friends on the Music Assistant team have released their latest hit: Music Assistant 2.7! 💃🏻
They've jazzed up the UI & UX with a chart-topping lineup of new features & providers, and introduce a new streaming protocol they're spinning up! 💿 Catch up on all that's new 👇🏼
They've jazzed up the UI & UX with a chart-topping lineup of new features & providers, and introduce a new streaming protocol they're spinning up! 💿 Catch up on all that's new 👇🏼
Nouveau : le 2FA par courrier postal sur l'espace client de AG2R !
December 17, 2025 at 8:55 AM
Nouveau : le 2FA par courrier postal sur l'espace client de AG2R !