Daniel Marbach

I learned .NET performance by sending PRs to the Azure SDK. The rejected ones taught me the most, because a maintainer would ask: is this complexity worth it? New series on what I picked up, starting with when to bother at all. www.planetgeek.ch/2026/10/27/w... #dotnet #performance

It's still alive and useful

How to keep enjoying programming in a world of LLMs discourse.haskell.org/t/how-to-kee...

My vacation experiment... Makes your AI agent think like the architect everyone rolls their eyes at, until they're right. danielmarbach.github.io/turtleneck/ #AgentSkills #aiagent

I published a new article: the hidden trap of fixed buffers in C#. It explains a quirk of fixed buffers that could easily bite you, if you're one of the few people who still have to use that feature. minidump.net/the-hidden-t...

Azure Service Bus cannot autoforward a session-enabled subscription. I explored a transactional bridge that keeps one session-enabled endpoint queue and a recoverability model. www.planetgeek.ch/2026/09/21/a... #azure #dotnet

Delayed retries can break Azure Service Bus session ordering. If A1 fails, A2 and A3 may overtake it. Strict order may require a hold-back. www.planetgeek.ch/2026/09/15/a... #azure #dotnet

Topology migrations are safest when they are boring. While helping a customer migrate an Azure Service Bus topology, we moved one event stream at a time: prepare the new path, switch publishers, observe, then remove the old path. www.planetgeek.ch/2026/09/02/a... #azure #dotnet

One backed-up event stream on a shared Service Bus topic can send unrelated API latency through the roof. I've seen it happen. A shared topic concentrates risk. Design topics as failure boundaries. www.planetgeek.ch/2026/08/25/a... #azure #dotnet

One topic, many subscriptions in Azure Service Bus. A shared topic can be a good trade-off. But filters, fan-out, and storage work accumulate there, and topic depth shows when delivery falls behind. www.planetgeek.ch/2026/08/14/a... #AzureServiceBus #NServiceBus

I’ve been using Azure Service Bus since the Service Bus for Windows Server days. My new series covers Azure Service Bus lessons learned the hard way. First up: filter count. At scale, the number of rules can matter more than the filter type. www.planetgeek.ch/2026/08/02/a... #azure

1/ The Chinese Open Source model Kimi-k3 from Moonshot AI is claiming it will release it’s weights on Monday. «The full model weights will be released by July 27, 2026.» What does this mean in normal speak and what are the possible implications on stocks and politics? www.kimi.com/blog/kimi-k3

Finally something that makes the open router added markup worth it openrouter.ai/docs/guides/...

How do you keep performance gains without fooling yourself? The final post in my performance and benchmarking series covers useful regression gates, benchmark variance, noisy CI runners, and why human judgment still matters. www.planetgeek.ch/2026/07/20/k... #dotnet #performance

So happy to have @debbie.codes joining us this September 💛 Platform Engineer doing Applied AI at Zephyr Cloud, ex-Microsoft Playwright wizard, and just genuinely one of the good ones in this community. Come say hi and catch her talk!

UEFA www.uefa.com/news-media/n...

I wrote about what happens when a message handler outlives the queue lease. Renewing sounds easy until you need a renewer, mutating receipts, coordinated delete, and shutdown juggling. The first loop is easy. The edges are where the work lives. www.planetgeek.ch/2026/06/29/w...

A benchmark win is not the finish line. The real workload may tell a different story. Profile the larger execution path again to see whether the improvement compounds. www.planetgeek.ch/2026/06/22/a...

The first version of a message pump is easy. The tenth version contains: retries idempotency transactions topology monitoring The hard part isn’t the loop. It’s owning every failure mode behind the loop. www.planetgeek.ch/2026/06/20/m... #dotnet #messaging

The biggest red bar isn’t always the biggest problem. Profilers reveal costs. We set priorities. www.planetgeek.ch/2026/06/08/r... #dotnet #performance

We inherited a legacy medical invoicing system. The business wanted to expand into web shops. Same invoices. Very different failure modes. Here’s what a message queue taught us about temporal decoupling 🧵👇 www.planetgeek.ch/2026/06/13/l...

Production code is too noisy. Benchmarks are too focused. Between them sits the profiling harness. Small enough to isolate a code path. Realistic enough to expose allocations and CPU costs. Visibility first. Comparison second. www.planetgeek.ch/2026/06/01/b... #dotnet #performance

The first benchmark I wrote looked deceptively easy. A class. A few attributes. A method. The hard part isn't writing benchmarks. It's knowing what deserves one. Profiles identify. Benchmarks validate. Production teaches. www.planetgeek.ch/2026/05/27/s... #dotnet #performance

Openclaw Patch has now #dotnet support thanks to a collaboration between me github.com/openclaw/cla... and Simon github.com/openclaw/cla...

😂

Proposal: Open Source Maintenance Fee for Verify github.com/orgs/VerifyT... Any feedback is appreciated #dotnet

Preparing for a CfP? Read this first einarwh.no/blog/2026/04...

It's not too late to register for Poornima's workshop - Beyond Publish/Subscribe: Messaging Patterns in Practice

.NET has an out of band update today to fix CVE-2026-40372, an Elevation of Privilege, which, in some cases, could allow an attacker to forge authentication tickets, or decode authentication tickets or other protected data. github.com/dotnet/annou...

Most engineers undervalue their time. You have more important work to do than re-inventing the wheel.

Mortal Kombat was actually based on a Scandinavian church song. It was a Finnish hymn

We don't need another DDD intro talk. We need your stories. The refactoring that almost sank the project. The EventStorming that exposed real org structure. The model that collapsed under load. KanDDDinsky 2026 is built on experience reports. CFP closes March 21: sessionize.com/kandddinsky-...

PerfView can record all managed exceptions in all processes system-wide thanks to the .NET ETW provider, with callstacks. I built a viewer for these .etl files:

I like @willvelida.com's definition of AI coding as HVE (hyper velocity engineering). Important point being velocity which implies *direction* not just speed. #DDDMelb

We are asking developers to do more with less, including less pay. Either we have managed to cut cost without reducing output, or we have increased output, but have very little to show for it. I'm sure there is another narrative around creating new opportunities, but I'm not hearing about those.

inspired by CLAUDE.md, I’ve started putting markdown files named after coworkers into work code repos so I can remind them to stop doing shit to the codebase that annoys me for some reason they’re all mad at me now, which means ill be adding commands to JEREMY.md for an attitude adjustment

The enshitification of chatgpt medium.com/write-a-cata...

Vercel's AGENTS.md approach outperforms skills by embedding comprehensive Next.js docs into the agent context, avoiding decision points and ordering issues while ensuring consistent availability across turns — though skills still shine for focused, user-triggered tasks like upgrades or migrations.

Join @jasontaylordev for a live webinar: Effortless Distributed Systems with Aspire, February 4 at 01:00 UTC. Learn how Aspire orchestrates services with reliability & observability, NServiceBus improves resilience, and Azure Developer CLI streamlines dev→cloud.

I'd wager this is the angriest statement ever issued by the Nobel Peace Prize people...

Neat view but super crowded today

Interesting Azure ☁ update -> [Launched] Generally Available: Geo-Replication for #Azure Service Bus Premium

Update: I stopped. I no longer have a blog. Peaked early.

I love how this person with a vested interest in selling AI solutions is acknowledging that AI writes shit code and, instead of improving it, we should just lower our standards. This is how you get the 737 Max 8.

The temporary ignorance superpower www.davidpoll.com/2025/12/igno...

🐘 Oh, that's nice: Postgres 19 is going to ship read-your-writes for standbys when using asynchronous replication, via a new command WAIT FOR LSN (similar to WAIT_FOR_EXECUTED_GTID_SET in MySQL). Very cool! www.postgresql.org/docs/devel/w...

Malicious Fody package thehackernews.com/2025/12/rogu...