Open Source contributor, #BenchmarkDotNet maintainer. My job on .NET Team is to make the .NET Core the fastest developer platform on the planet.
Gdańsk, Poland
Joined December 2014
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Adam Sitnik retweeted
AI now finds bugs that survived decades of human review, and writes code that looks right but isn’t. Tests can’t keep up.
LeanCIL: formal verification for .NET
Proofs about compiled C# and F# (any dotnet lang), for every input, checked by @leanprover
github.com/NethermindEth/Lea…
Adam Sitnik retweeted
Building RAG or semantic search in .NET? 🧠🔎
Microsoft.Extensions.VectorData abstracts the vector store so your app can upsert embeddings, run similarity searches, filter with LINQ + switch database providers (cont) msft.it/l/6013a0kST
ALT A gradient background transitioning from yellow to purple. On the left, an illustration of code symbols with a document icon. The text reads: 'Use vector stores in .NET AI apps' and 'Read the docs'.
Adam Sitnik retweeted
A single .md file with tips & tricks for high-performance .NET/C# code, mostly meant for AI, and mostly aimed at benchmarks against the crustaceans 🙃 github.com/EgorBo/BlazingFas… (no unsafe!)
Contributions welcome if anything's missing, cc @axeng200 @ben_a_adams
Adam Sitnik retweeted
When in doubt, just use C# and ASP.NET Core.
It's blazing fast.
.NET 11 RC2 is even faster.
For me, it's the best overall major web framework - auth, config, logging, perf, modular middleware, DI, cross-plat, etc.
But I didn't expect this:
Przepraszam wszystkich najmocniej, ale muszę odwołać moją dzisiejszą prezentację (syn dostał zapalenia ucha i muszę ugasić ten pożar).
Zapraszam wszystkich z Trójmiasta i okolic na moją prezentację w środę na TG.NET gdzie opowiem o zmianach które wprowadziliśmy w Process w .NET 11. meetup.com/pl-pl/tg-net/even…
Zapraszam wszystkich z Trójmiasta i okolic na moją prezentację w środę na TG.NET gdzie opowiem o zmianach które wprowadziliśmy w Process w .NET 11. meetup.com/pl-pl/tg-net/even…
Adam Sitnik retweeted
It's faster. It's not rewritten in Rust.
We are making large changes to C# Dev Kit, so it's faster and lighter than ever before.
It's available in pre-release today.
Here's a blog post with more information:
devblogs.microsoft.com/dotne…
Adam Sitnik retweeted
PolyType v2.0.0-rc.1 includes preview support for C# 15 union types and closed hierarchies. Your feedback would be appreciated.
github.com/eiriktsarpalis/Po…
#dotnet
Adam Sitnik retweeted
The Aspire 13.6 dashboard now uses Native AOT 💫 That means 66% faster median page-visible startup and no separately installed .NET runtime for the native dashboard executable. @JamesNK walks through how the team got there: devblogs.microsoft.com/aspir…
Adam Sitnik retweeted
The upcoming release of System.Text.Json sees a swath of new features focusing on C# and F# union support, JSONL, and further narrowing the functional gap between reflection and the source generator:
learn.microsoft.com/en-us/do…
#dotnet
Adam Sitnik retweeted
I have a new JSON-RPC library for .NET, it's PolyType-based, NativeAOT ready, user-friendly, and much faster than StreamJsonRpc. It supports UTF-8 JSON and MsgPack encoding. Let me know what you think.
aarnott.github.io/Nerdbank.J…
Adam Sitnik retweeted
C# FTW
Everyone doing performance tests: please stop excluding C#. Thanks.
After all, this is a top language in Age of Agents. Along with Rust.
github.com/devmobasa/lemire-…
Adam Sitnik retweeted
New Video / Blog Post: "Run Local Akka .NET Clusters with .NET Aspire"
The biggest win here is that debugging / orchestrating a cluster is trivial now thanks to Aspire + Akka .Management.
Links in next post.
ALT Akka.NET Aspire AppHost example
Adam Sitnik retweeted
C#/.NET being pushed hard running infrastructure at Ethereum's scale.
Nethermind runs on ~3k nodes and accounts for ~33% of staked nodes - supporting a ~$334B native asset, ~$146B of stablecoins and ~$54B deposited in DeFi apps.
Nethermind 2.0 has some amazing performance work in it: up to 2.55x block throughput, p99 block processing from 1.65s to 208ms, eth_call RPC 15-27% faster and Keccak-256 ~30% faster with platform intrinsics.
Nethermind Client 2.0.0 is out. It changes how the node stores Ethereum's state: archive nodes drop from ~30 TB to ~2 TB, you choose the history you keep, and blocks process 2–3× faster than the previous release on a fresh node.
Nine years since the first commit. The fastest execution software we've ever built.
Breaking changes; read the notes before upgrading. Release: github.com/NethermindEth/net…
It's been a while since I've contributed to ASP.NET, but this time I have an idea that keeps me up at night (io_uring_multishot).
Adam Sitnik retweeted
🎸 .NET 11 goes to 11. 🔥
Smarter JIT deabstraction, fewer allocations, fewer bounds checks, tighter loops, SIMD boosts, and hundreds of runtime/library optimizations. ⚡
Your code may get faster without changing a line.
📖 Read: msft.it/6011abvXZ
ALT A cartoon character, resembling a robot, rides a pink rocket labeled '.NET 11' against a purple background. The text 'Performance Improvements in .NET 11' appears prominently to the left.
Adam Sitnik retweeted
Reminder: /r/moderndotent's monthly .NET user group thread is up - promote your September 2026 meetups!
reddit.com/r/moderndotnet/co…
