Johannes Weiss
@jweiss.io
Computer programmer (http://github.com/weissi). Distributed systems, ML infrastructure/eval, Swift, previously #SwiftNIO — ♥ snowboarding
London, UK
London, UK
👏 Super cool to get Swift on the server showcased at reInvent
🏎️ While Swift was originally created for iOS/macOS apps, many might not realize that at Apple we run Swift on the server to operate massive services, on Linux, serving billions of requests per day. Check out our VP's keynote at AWS re:Invent for details youtu.be/JeUpUK0nhC0?...
AWS re:Invent 2025 - Keynote with Peter DeSantis and Dave Brown
YouTube video by AWS Events
youtu.be
December 6, 2025 at 9:36 AM
👏 Super cool to get Swift on the server showcased at reInvent
Reposted by Johannes Weiss
🎉 10 years of open source Swift! A decade ago today, we opened Swift to the world with a simple blog post: swift.org/blog/welcome
What's grown since—thanks to an incredible community of contributors—has been extraordinary. Here's to the next ten years. 🧡
What's grown since—thanks to an incredible community of contributors—has been extraordinary. Here's to the next ten years. 🧡
December 4, 2025 at 12:08 AM
🎉 10 years of open source Swift! A decade ago today, we opened Swift to the world with a simple blog post: swift.org/blog/welcome
What's grown since—thanks to an incredible community of contributors—has been extraordinary. Here's to the next ten years. 🧡
What's grown since—thanks to an incredible community of contributors—has been extraordinary. Here's to the next ten years. 🧡
Reposted by Johannes Weiss
We'd be happy to see you at the inaugural Swift for Wasm Community Hour on 3rd of December! More details in this post on Swift Forums: forums.swift.org/t/swift-for-...
Swift for Wasm Community Hour (3rd of December 2025)
I'm excited to announce the inaugural Swift for Wasm Community Hour! We welcome everyone at this event, no matter your background or experience. This is an open space to ask questions and to learn fr...
forums.swift.org
November 21, 2025 at 11:57 AM
We'd be happy to see you at the inaugural Swift for Wasm Community Hour on 3rd of December! More details in this post on Swift Forums: forums.swift.org/t/swift-for-...
Reposted by Johannes Weiss
⚙️ Swift progress on embedded Swift, for memory-safe, fast code in resource-constrained environments. The latest updates are coming to Swift 6.3, and you can read more here: www.swift.org/blog/embedde... #IoT
November 17, 2025 at 9:29 PM
⚙️ Swift progress on embedded Swift, for memory-safe, fast code in resource-constrained environments. The latest updates are coming to Swift 6.3, and you can read more here: www.swift.org/blog/embedde... #IoT
Reposted by Johannes Weiss
Ever since the parliamentary wars of Brexit, the UK media and Westminster bubble craving for drama seems to have increased exponentially.
What is technically still a relatively 'new' Labour government with a huge absolute majority is already (portrayed?) as fighting with its lasts gasps.
What is technically still a relatively 'new' Labour government with a huge absolute majority is already (portrayed?) as fighting with its lasts gasps.
🚨Labour chaos latest:
🔥 Starmer allies accuse Streeting of plotting
🔥 Streeting says "categorically untrue"
🔥 Splits in No10 over high-stakes gamble
🔥 Labour MPs furious
🔥 Government source: "Number ten has gone into full bunker mode"
Story 👇
www.huffingtonpost.co.uk/entry/cabine...
🔥 Starmer allies accuse Streeting of plotting
🔥 Streeting says "categorically untrue"
🔥 Splits in No10 over high-stakes gamble
🔥 Labour MPs furious
🔥 Government source: "Number ten has gone into full bunker mode"
Story 👇
www.huffingtonpost.co.uk/entry/cabine...
Cabinet Splits Erupt As Keir Starmer Allies Accuse Wes Streeting Of Plotting Against Him
Labour MPs left furious by latest bout of party infighting.
www.huffingtonpost.co.uk
November 12, 2025 at 7:08 AM
Ever since the parliamentary wars of Brexit, the UK media and Westminster bubble craving for drama seems to have increased exponentially.
What is technically still a relatively 'new' Labour government with a huge absolute majority is already (portrayed?) as fighting with its lasts gasps.
What is technically still a relatively 'new' Labour government with a huge absolute majority is already (portrayed?) as fighting with its lasts gasps.
Very cool to see AWS and the Swift community work on this together aws.amazon.com/blogs/openso...
The Swift AWS Lambda Runtime moves to AWSLabs | Amazon Web Services
We’re excited to share that the Swift AWS Lambda Runtime project has officially moved to the AWS Labs organization. You can now find it here: 👉 https://github.com/awslabs/swift-aws-lambda-runtime This...
aws.amazon.com
November 6, 2025 at 6:56 PM
Very cool to see AWS and the Swift community work on this together aws.amazon.com/blogs/openso...
Cat's marketing department is ... something. Seems like they're making gas turbines in a facility they call "Solar Turbines". Under the Oil & Gas category, of course.
November 6, 2025 at 7:48 AM
Cat's marketing department is ... something. Seems like they're making gas turbines in a facility they call "Solar Turbines". Under the Oil & Gas category, of course.
Reposted by Johannes Weiss
Observability is the key to understanding how your system performs and where problems are occurring. Moritz Lang and Si Beaumont gives us the run down on how it works in Swift!
www.youtube.com/watch?v=HSxI...
www.youtube.com/watch?v=HSxI...
Observability in Server-Side Swift - Si Beaumont & Moritz Lang
🎥 Recorded at the ServerSide.swift conference in London in 2025.
🙌 Sponsored by Broken Hands: https://www.brokenhands.io
🐥 Twitter: https://twitter.com/swiftserverconf
🐘 Mastodon:…
www.youtube.com
November 5, 2025 at 4:02 PM
Observability is the key to understanding how your system performs and where problems are occurring. Moritz Lang and Si Beaumont gives us the run down on how it works in Swift!
www.youtube.com/watch?v=HSxI...
www.youtube.com/watch?v=HSxI...
Reposted by Johannes Weiss
Nice writeup about plans wrt. the #swift typechecker by @slava@mathstodon.xyz
Roadmap for improving the type checker
Roadmap for improving the type checker In the past, we've released various "manifestos" and "roadmaps" to discuss planned improvements to the language. This post is also a roadmap of sorts, but instead, the focus is on the implementation rather than user-visible language changes (however, I will briefly mention a few potential language changes at the very end). Specifically, I'm going to talk about some work we are doing to improve expression type checking in the Swift compiler. This includes c...
forums.swift.org
October 30, 2025 at 10:47 PM
Nice writeup about plans wrt. the #swift typechecker by @slava@mathstodon.xyz
Reposted by Johannes Weiss
A post from @joannis on the #Swift blog about the new preview of the Android SDK for Swift
www.swift.org/blog/nightly...
www.swift.org/blog/nightly...
Announcing the Swift SDK for Android
Swift has matured significantly over the past decade — extending from cloud services to Windows applications, browser apps, and microcontrollers. Swift powers apps and services of all kinds, and thank...
www.swift.org
October 24, 2025 at 9:33 PM
A post from @joannis on the #Swift blog about the new preview of the Android SDK for Swift
www.swift.org/blog/nightly...
www.swift.org/blog/nightly...
Made a little thing that may help you profile your services from within their own process -- no extra privileges or tools required.
New tooling for profiling performance-critical services with Swift -- introducing the Swift Profile Recorder. More here: www.swift.org/blog/swift-p...
October 6, 2025 at 7:24 PM
Made a little thing that may help you profile your services from within their own process -- no extra privileges or tools required.
Isn't that too beautiful? PM2.5 of an overnight pyrolytic oven clean starting at 1am.
Still woke up at 3am on account of bad air, despite closed doors and open windows in kitchen...
Still woke up at 3am on account of bad air, despite closed doors and open windows in kitchen...
October 6, 2025 at 6:37 AM
Isn't that too beautiful? PM2.5 of an overnight pyrolytic oven clean starting at 1am.
Still woke up at 3am on account of bad air, despite closed doors and open windows in kitchen...
Still woke up at 3am on account of bad air, despite closed doors and open windows in kitchen...
Reposted by Johannes Weiss
It's been an incredible year for the conference. We had attendees from 6(!) continents come together for an amazing 3 days of workshops, talks and meeting each other face to face. Thank you to all the volunteers and speakers, it's been truly special
October 3, 2025 at 9:30 PM
It's been an incredible year for the conference. We had attendees from 6(!) continents come together for an amazing 3 days of workshops, talks and meeting each other face to face. Thank you to all the volunteers and speakers, it's been truly special
Reposted by Johannes Weiss
The new Swift configuration API makes the most of Swift's type checking and expressivity to make it eady to solve common config tasks. @czechboy0.dev walks us through its features @serversideswift.info
forums.swift.org/t/introducin...
forums.swift.org/t/introducin...
October 3, 2025 at 3:29 PM
The new Swift configuration API makes the most of Swift's type checking and expressivity to make it eady to solve common config tasks. @czechboy0.dev walks us through its features @serversideswift.info
forums.swift.org/t/introducin...
forums.swift.org/t/introducin...
Reposted by Johannes Weiss
October 3, 2025 at 4:30 PM
Reposted by Johannes Weiss
If a team that lived in C and Go can build production container infrastructure in Swift, the language is ready for serious server-side systems work. - Eric Ernst, Apple #swiftlang #serversideSwift2025
github.com/apple/contai...
github.com/apple/contai...
GitHub - apple/container: A tool for creating and running Linux containers using lightweight virtual machines on a Mac. It is written in Swift, and optimized for Apple silicon.
A tool for creating and running Linux containers using lightweight virtual machines on a Mac. It is written in Swift, and optimized for Apple silicon. - GitHub - apple/container: A tool for creati...
github.com
October 3, 2025 at 4:03 PM
If a team that lived in C and Go can build production container infrastructure in Swift, the language is ready for serious server-side systems work. - Eric Ernst, Apple #swiftlang #serversideSwift2025
github.com/apple/contai...
github.com/apple/contai...
#ServerSideSwift was so great. Fantastic to (re)connect with people from literally all over the world.
Loved the very positive energy and the buzz around all the new stuff & maturity refinements around the existing tech.
Most importantly thank you @0xtim for putting up this amazing show again!
Loved the very positive energy and the buzz around all the new stuff & maturity refinements around the existing tech.
Most importantly thank you @0xtim for putting up this amazing show again!
October 4, 2025 at 10:17 AM
#ServerSideSwift was so great. Fantastic to (re)connect with people from literally all over the world.
Loved the very positive energy and the buzz around all the new stuff & maturity refinements around the existing tech.
Most importantly thank you @0xtim for putting up this amazing show again!
Loved the very positive energy and the buzz around all the new stuff & maturity refinements around the existing tech.
Most importantly thank you @0xtim for putting up this amazing show again!
Dropped my last coffee beans on the floor this morning. Was desperate enough that I picked them all up and made a coffee. Guess it's 99% arabica & 1% random dirt 🙈
September 26, 2025 at 7:33 AM
Dropped my last coffee beans on the floor this morning. Was desperate enough that I picked them all up and made a coffee. Guess it's 99% arabica & 1% random dirt 🙈
Reposted by Johannes Weiss
Ever wonder how to write safe and fast code to run on your server ?
Ever considered the open source Swift programming language ?
Maybe it's time
Ever considered the open source Swift programming language ?
Maybe it's time
The Growth of the Swift Server Ecosystem
Nearly ten years ago, Swift was open sourced and an official runtime for Linux was released. I’ve been involved with Swift on the server since almost the very beginning, originally picking it up as a way to use a language I really enjoyed for backend development. In that time Swift has come a long way, with stability across platforms, a burgeoning ecosystem and many success stories. It’s matured into a great option for highly-scalable server applications, websites, and lambdas. In this post, I’ll cover how Swift:
www.swift.org
September 24, 2025 at 9:38 PM
Ever wonder how to write safe and fast code to run on your server ?
Ever considered the open source Swift programming language ?
Maybe it's time
Ever considered the open source Swift programming language ?
Maybe it's time
Reposted by Johannes Weiss
The conference has always been about bringing the community together and growing Swift on the server. So to help, we're dropping the price of the beginner workshop to just £25! This workshop from Apple will teach you everything you need to get going!
Tickets - www.serversideswift.info/tickets/
Tickets - www.serversideswift.info/tickets/
September 21, 2025 at 11:00 PM
The conference has always been about bringing the community together and growing Swift on the server. So to help, we're dropping the price of the beginner workshop to just £25! This workshop from Apple will teach you everything you need to get going!
Tickets - www.serversideswift.info/tickets/
Tickets - www.serversideswift.info/tickets/
Reposted by Johannes Weiss
Swift 6.2 is here, including so much 🆕🥳:
⏩Approachable concurrency
🦺Opt-in strict memory safety
📦WebAssembly support
🏃Faster build perf for macros
🐞Enhanced async debugging
📚Inline stack-based arrays
🚇Subprocess support
🧪Test result attachments
www.swift.org/blog/swift-6...
⏩Approachable concurrency
🦺Opt-in strict memory safety
📦WebAssembly support
🏃Faster build perf for macros
🐞Enhanced async debugging
📚Inline stack-based arrays
🚇Subprocess support
🧪Test result attachments
www.swift.org/blog/swift-6...
Swift 6.2 Released
We’re excited to announce Swift 6.2, a release aimed at making every Swift developer more productive, regardless of where or how you write code. From improved tooling and libraries to enhancements in ...
www.swift.org
September 16, 2025 at 5:29 PM
Swift 6.2 is here, including so much 🆕🥳:
⏩Approachable concurrency
🦺Opt-in strict memory safety
📦WebAssembly support
🏃Faster build perf for macros
🐞Enhanced async debugging
📚Inline stack-based arrays
🚇Subprocess support
🧪Test result attachments
www.swift.org/blog/swift-6...
⏩Approachable concurrency
🦺Opt-in strict memory safety
📦WebAssembly support
🏃Faster build perf for macros
🐞Enhanced async debugging
📚Inline stack-based arrays
🚇Subprocess support
🧪Test result attachments
www.swift.org/blog/swift-6...
Reposted by Johannes Weiss
With ✨Swift 6.2 ✨, you can now target WebAssembly, including WASI support. Get started here: www.swift.org/documentatio... #Wasm
September 17, 2025 at 7:36 PM
With ✨Swift 6.2 ✨, you can now target WebAssembly, including WASI support. Get started here: www.swift.org/documentatio... #Wasm
Who else is going to #ServerSideSwift? Two weeks to go, can't wait to hear what y'all have been up to!
To make the deal even sweeter, I hear there's tasty 15% off discount code for www.serversideswift.info/tickets/: COMMUNITY15
To make the deal even sweeter, I hear there's tasty 15% off discount code for www.serversideswift.info/tickets/: COMMUNITY15
Tickets | ServerSide.swift Conference
ServerSide.swift - the conference for server-side Swift developers
www.serversideswift.info
September 16, 2025 at 4:22 PM
Who else is going to #ServerSideSwift? Two weeks to go, can't wait to hear what y'all have been up to!
To make the deal even sweeter, I hear there's tasty 15% off discount code for www.serversideswift.info/tickets/: COMMUNITY15
To make the deal even sweeter, I hear there's tasty 15% off discount code for www.serversideswift.info/tickets/: COMMUNITY15
Yup! I confused a lot of people when I used the UK version in a meeting a few months ago 😛
It’s very confusing that “to table something” has the opposite meaning in the US and UK. 😵💫
September 11, 2025 at 6:18 AM
Yup! I confused a lot of people when I used the UK version in a meeting a few months ago 😛
🤩
When it comes to seamlessly integrating the bike and train, proximity of parking to the platform is everything, with Dutch railways dictating the walk not exceed four minutes. Which is why Tilburg Station has built two bike parking facilities totalling 7,500 spaces—one on either side of the tracks.🧵
September 5, 2025 at 8:18 AM
🤩