Howard van Rooijen
@hvr.endj.in
Founder @endjin.com Microsoft #MVP for Azure & Developer Technologies. Try to help people and orgs to become the best versions of themselves.
Yet another misstep by the .NET PG. Polyglot Notebooks was a fantastic tool. Getting a bit tired of AI draining all the resources...
github.com/dotnet/inter...
github.com/dotnet/inter...
📢 DEPRECATION ANNOUNCEMENT: Polyglot Notebooks · Issue #4163 · dotnet/interactive
📢 DEPRECATION ANNOUNCEMENT: Polyglot Notebooks The Polyglot Notebooks Extension will be deprecated on March 27th, 2026. ❓What This Means The extension will not be disabled or uninstalled from your ...
github.com
February 13, 2026 at 8:20 AM
Yet another misstep by the .NET PG. Polyglot Notebooks was a fantastic tool. Getting a bit tired of AI draining all the resources...
github.com/dotnet/inter...
github.com/dotnet/inter...
Spent Wednesday in Bristol with Barry & Carmel, as Barry was presenting his talk "No-Compromise Data Apps: Why Streamlit is the Missing Piece in Your Analytics Stack" at Data Bristol. We also had a cracking lunch at Yakinori - highly recommended www.yakinori.co.uk
February 13, 2026 at 8:16 AM
Spent Wednesday in Bristol with Barry & Carmel, as Barry was presenting his talk "No-Compromise Data Apps: Why Streamlit is the Missing Piece in Your Analytics Stack" at Data Bristol. We also had a cracking lunch at Yakinori - highly recommended www.yakinori.co.uk
New post which uses a retail example - analysing customer reviews about delivery to explain RAG.
endjin.com/blog/2026/02...
endjin.com/blog/2026/02...
What is Retrieval-Augmented Generation (RAG)? | endjin
What is RAG? Learn how RAG combines retrieval, augmentation & generation to ground GenAI responses in your data while reducing hallucinations & improving accuracy.
endjin.com
February 13, 2026 at 8:10 AM
New post which uses a retail example - analysing customer reviews about delivery to explain RAG.
endjin.com/blog/2026/02...
endjin.com/blog/2026/02...
Reposted by Howard van Rooijen
"Wonder Man is the most distinctive MCU entry since WandaVision and among the highest quality Disney+ shows that Marvel has produced."
It's a standalone, the show's heart is in its grounded relationships, and Josh Gad plays Olaf in the club. If you're not watching Wonder Man, you're missing out:
It's a standalone, the show's heart is in its grounded relationships, and Josh Gad plays Olaf in the club. If you're not watching Wonder Man, you're missing out:
Wonder Man Brings a Cozy Hollywood Bromance to the MCU - Reactor
Wonder Man offers the freshest take on the MCU since WandaVision
reactormag.com
February 2, 2026 at 6:46 PM
"Wonder Man is the most distinctive MCU entry since WandaVision and among the highest quality Disney+ shows that Marvel has produced."
It's a standalone, the show's heart is in its grounded relationships, and Josh Gad plays Olaf in the club. If you're not watching Wonder Man, you're missing out:
It's a standalone, the show's heart is in its grounded relationships, and Josh Gad plays Olaf in the club. If you're not watching Wonder Man, you're missing out:
1/4 We've been overhauling our data engineering processes as we got tired of waiting for clusters to spin up, bad web-based dev UX,& tests taking hours to complete. We migrated our dataframe orientated workloads from #Spark to #Polars and immediately felt the benefits.
endjin.com/blog/2026/01...
endjin.com/blog/2026/01...
Polars: Faster Pipelines, Simpler Infrastructure, Happier Engineers | endjin
Discover how Polars is revolutionizing DataFrame operations with up to 20x faster performance than Pandas, efficient memory use, and an intuitive API that leverages modern hardware for data analysis a...
endjin.com
January 31, 2026 at 8:51 AM
1/4 We've been overhauling our data engineering processes as we got tired of waiting for clusters to spin up, bad web-based dev UX,& tests taking hours to complete. We migrated our dataframe orientated workloads from #Spark to #Polars and immediately felt the benefits.
endjin.com/blog/2026/01...
endjin.com/blog/2026/01...
Absolutely loving Wonder Man. It's up there with Loki. Sir Ben Kingsley is obviously having an absolute blast playing Trevor Slattery again. Yahya Abdul-Mateen II is great.
Marvel content always shines when they focus on the characters and everything fantastical is just the context to explore them.
Marvel content always shines when they focus on the characters and everything fantastical is just the context to explore them.
January 30, 2026 at 9:43 AM
Absolutely loving Wonder Man. It's up there with Loki. Sir Ben Kingsley is obviously having an absolute blast playing Trevor Slattery again. Yahya Abdul-Mateen II is great.
Marvel content always shines when they focus on the characters and everything fantastical is just the context to explore them.
Marvel content always shines when they focus on the characters and everything fantastical is just the context to explore them.
Reposted by Howard van Rooijen
North East Data Scientists is back with the first meetup of the year.
🔍 Roy Ruddle on investigating data quality
📊 Barry Smart on building interactive Streamlit apps
For anyone working with R, Python, analytics, or data science in the North East.
🗓 29 Jan 2026 | Newcastle
🔍 Roy Ruddle on investigating data quality
📊 Barry Smart on building interactive Streamlit apps
For anyone working with R, Python, analytics, or data science in the North East.
🗓 29 Jan 2026 | Newcastle
January Meetup, Thu, Jan 29, 2026, 6:00 PM | Meetup
We're delighted to welcome you to our first meetup of 2026!
Pizza and soft drinks will be provided on a first-come-first-served basis from 6pm as usual. There will be no p
www.meetup.com
January 16, 2026 at 10:53 AM
North East Data Scientists is back with the first meetup of the year.
🔍 Roy Ruddle on investigating data quality
📊 Barry Smart on building interactive Streamlit apps
For anyone working with R, Python, analytics, or data science in the North East.
🗓 29 Jan 2026 | Newcastle
🔍 Roy Ruddle on investigating data quality
📊 Barry Smart on building interactive Streamlit apps
For anyone working with R, Python, analytics, or data science in the North East.
🗓 29 Jan 2026 | Newcastle
Discovered that Phantasm I - IV are on Amazon Prime over the weekend. The spheres are nowhere near as scary as I remember - I must have conflated them with knife missiles from The Culture. A reboot with a more cosmic horror vibe could be really good.
January 26, 2026 at 5:02 PM
Discovered that Phantasm I - IV are on Amazon Prime over the weekend. The spheres are nowhere near as scary as I remember - I must have conflated them with knife missiles from The Culture. A reboot with a more cosmic horror vibe could be really good.
Reposted by Howard van Rooijen
Any senior .NET devs looking for a new gig? We’ve got openings doing some pretty impactful stuff.
My DMs are open.
My DMs are open.
January 20, 2026 at 4:48 PM
Any senior .NET devs looking for a new gig? We’ve got openings doing some pretty impactful stuff.
My DMs are open.
My DMs are open.
Reposted by Howard van Rooijen
Gain even more trust and compliance with OneLake diagnostics immutability (Generally Available) by Tom Peplow blog.fabric.microsoft.com/en-GB/blog/g...
Gain even more trust and compliance with OneLake diagnostics immutability (Generally Available) | Microsoft Fabric Blog | Microsoft Fabric
In October 2025, we introduced OneLake diagnostics—a powerful capability that helps teams “answer who accessed what, when, and how” across your Fabric Lakehouse environment. OneLake diagnostics...
blog.fabric.microsoft.com
January 20, 2026 at 6:30 PM
Gain even more trust and compliance with OneLake diagnostics immutability (Generally Available) by Tom Peplow blog.fabric.microsoft.com/en-GB/blog/g...
I was actually really impressed with the Star Trek: Starfleet Academy pilot. It did all the things a pilot should do (but most really don't), and it did them really well. I like that they've maintained some of the Lower Decks humour. Really looking forward to seeing Ep 2 tonight.
January 16, 2026 at 11:52 AM
I was actually really impressed with the Star Trek: Starfleet Academy pilot. It did all the things a pilot should do (but most really don't), and it did them really well. I like that they've maintained some of the Lower Decks humour. Really looking forward to seeing Ep 2 tonight.
Reposted by Howard van Rooijen
Happy birthday to me. 2025 in review... joeabercrombie.com/2025-in-revi...
2025 in Review - Joe Abercrombie
Happy Birthday to me, happy birthday to me, happy birthday dear me-eee, yes indeed, 51 years old today and STILL a fresh new voice in this genre etc. etc. A YEAR IN BOOKSELLING – This was a big year f...
joeabercrombie.com
December 31, 2025 at 12:00 PM
Happy birthday to me. 2025 in review... joeabercrombie.com/2025-in-revi...
Reposted by Howard van Rooijen
The great @philco.bsky.social has added AOT support for Spectre.Console.Cli, and we've started a discussion on our Discord for anyone interested in trying it out and/or has feedback about the implementation: discord.com/channels/142...
Discord - Group Chat That’s All Fun & Games
Discord is great for playing games and chilling with friends, or even building a worldwide community. Customize your own space to talk, play, and hang out.
discord.com
December 29, 2025 at 5:36 PM
The great @philco.bsky.social has added AOT support for Spectre.Console.Cli, and we've started a discussion on our Discord for anyone interested in trying it out and/or has feedback about the implementation: discord.com/channels/142...
I turned 48 last month. In other news I've just booked in for an eye test on Monday and have ordered a much bigger monitor. This year has been a bit too blurry for my liking.
December 18, 2025 at 6:36 PM
I turned 48 last month. In other news I've just booked in for an eye test on Monday and have ordered a much bigger monitor. This year has been a bit too blurry for my liking.
Reposted by Howard van Rooijen
The first CoreCLR Interpreter benchmarks are out and it’s significantly (magnitudes) slower than Mono. But a good first starting point and should be enough time in the 11.0 timeframe to improve: github.com/dotnet/runti...
Interpreter Performance · Issue #122464 · dotnet/runtime
This issue holds various status information and work items for improving performance on platforms making use of interpreter with CoreCLR. This contains both interpreter performance related work ite...
github.com
December 18, 2025 at 4:14 PM
The first CoreCLR Interpreter benchmarks are out and it’s significantly (magnitudes) slower than Mono. But a good first starting point and should be enough time in the 11.0 timeframe to improve: github.com/dotnet/runti...
It's time for my favourite blog post of the year - the annual performance benchmark of our .NET based AIS (Automatic Identification System) - Marine Vessel Telemetry - parsing library. Every vessel over a certain size has to transmit information (name, location, status, direction etc).
December 10, 2025 at 9:23 AM
It's time for my favourite blog post of the year - the annual performance benchmark of our .NET based AIS (Automatic Identification System) - Marine Vessel Telemetry - parsing library. Every vessel over a certain size has to transmit information (name, location, status, direction etc).
Ian Griffiths (of the Programming C# books) is releasing a series of short videos on all the new features in C# 14... first up... Script Directives...
endjin.com/what-we-thin...
endjin.com/what-we-thin...
C# 14 New Feature: Script Directives | endjin
C# 14 & .NET 10 allow you to write complete programs in a single .cs file using the new Script Directives feature. This talk explores the new feature and how to use it.
endjin.com
November 28, 2025 at 11:23 AM
Ian Griffiths (of the Programming C# books) is releasing a series of short videos on all the new features in C# 14... first up... Script Directives...
endjin.com/what-we-thin...
endjin.com/what-we-thin...
Reposted by Howard van Rooijen
AI has transformed tech interviews into a game of cat and mouse.
November 27, 2025 at 3:35 AM
AI has transformed tech interviews into a game of cat and mouse.
Some thoughts on the UK budget: It seems the UKGOV are happy to class anyone with £5m assets as "wealthy" so why not raise the inheritance tax limit for farms to £5m also? It would remove one of the thorns in their sides...
November 27, 2025 at 7:04 AM
Some thoughts on the UK budget: It seems the UKGOV are happy to class anyone with £5m assets as "wealthy" so why not raise the inheritance tax limit for farms to £5m also? It would remove one of the thorns in their sides...
We've just released a new version of the Interactive Extensions for .NET (Ix.NET). Now that .NET 10.0 offers built-in support for LINQ to IAsyncEnumerable, it's time for Ix.NET's System.Linq.Async to step back.
endjin.com/blog/2025/11...
endjin.com/blog/2025/11...
endjin.com
November 26, 2025 at 7:18 AM
We've just released a new version of the Interactive Extensions for .NET (Ix.NET). Now that .NET 10.0 offers built-in support for LINQ to IAsyncEnumerable, it's time for Ix.NET's System.Linq.Async to step back.
endjin.com/blog/2025/11...
endjin.com/blog/2025/11...
I've been tracking Flatcar for a few years and it's fantastic that it's*finally* supported on AKS. Great article by @pixelrobots.co.uk
Flatcar Container Linux on #AzureKubernetesService: First Look by Richard Hooper pixelrobots.co.uk/2025/11/flat...
Flatcar Container Linux on AKS: First Look - Pixel Robots.
Reading Time: 6 minutesShare:Recently I spotted something new in the AKS CLI preview. Flatcar showed up as a valid OS SKU for Linux node pools. As someone who’s been running AKS clusters for years,...
pixelrobots.co.uk
November 22, 2025 at 7:40 AM
I've been tracking Flatcar for a few years and it's fantastic that it's*finally* supported on AKS. Great article by @pixelrobots.co.uk
Reposted by Howard van Rooijen
Spectre.Console 0.54.0 released! 🎉 spectreconsole.net/blog/posts/2...
Spectre.Console - Spectre.Console 0.54.0 released!
Spectre.Console.Cli has a new home!
spectreconsole.net
November 13, 2025 at 6:41 AM
Spectre.Console 0.54.0 released! 🎉 spectreconsole.net/blog/posts/2...
Reposted by Howard van Rooijen
It's #rejekts2025 day! Lots to learn 💉⚕️🩻🩺
November 8, 2025 at 2:32 PM
It's #rejekts2025 day! Lots to learn 💉⚕️🩻🩺
Some Rx .NET News!
github.com/dotnet/react... has been merged and github.com/dotnet/react... is available.
This PR finally closes:
- github.com/dotnet/react... (5 years old)
- github.com/dotnet/react... (3.5 years old)
You can see the rest of the v7.0 milestones here: github.com/dotnet/react...
github.com/dotnet/react... has been merged and github.com/dotnet/react... is available.
This PR finally closes:
- github.com/dotnet/react... (5 years old)
- github.com/dotnet/react... (3.5 years old)
You can see the rest of the v7.0 milestones here: github.com/dotnet/react...
Rx 7.0 packaging changes by idg10 · Pull Request #2268 · dotnet/reactive
Resolves #1461
Resolves #1745
This moves all of the UI-framework-specific types out of the public API of System.Reactive, and into framework-specific packages:
System.Reactive.Windows.Forms
System...
github.com
November 8, 2025 at 9:36 AM
Some Rx .NET News!
github.com/dotnet/react... has been merged and github.com/dotnet/react... is available.
This PR finally closes:
- github.com/dotnet/react... (5 years old)
- github.com/dotnet/react... (3.5 years old)
You can see the rest of the v7.0 milestones here: github.com/dotnet/react...
github.com/dotnet/react... has been merged and github.com/dotnet/react... is available.
This PR finally closes:
- github.com/dotnet/react... (5 years old)
- github.com/dotnet/react... (3.5 years old)
You can see the rest of the v7.0 milestones here: github.com/dotnet/react...