Carson Sievert (he/him)

{shinyreact} is promising. #rstats youtu.be/U1Dt0JdpgSo

It was such a joy working with @samuelbharti.com this summer. Absolutely insane what he was able to accomplish during his internship at @posit.co. Please give him a follow and check out this work if you're at all interested in shiny, bioinformatics, and genomics. #rstats #pydata

📦 Introducing shinyreact for R & Python Write your UI natively in React. Shrink your Shiny server to data-only logic. Agent Skills write the React for you. ✨ opensource.posit.co/blog/2026-09... This is the start! Tell us what you build and what breaks. #RStats #Python #Shiny #React

Wicked psyched to share that shinychat v0.5.0 #RStats and v0.7.1 #Python are now available! Check out all the rad new features on the Posit Open Source blog. #PositConf2026 opensource.posit.co/blog/2026-09...

We're excited to share commons, an R and Python package that helps data scientists build trustworthy data agents for their organizations! Read more on the @posit.co open source blog: opensource.posit.co/blog/2026-09...

New beta of #Rstats rig: LOTS of EXCITING stuff: - new: web site: rig.r-lib.org - new: user-mode R installation: rig.r-lib.org/admin-vs-use... - new: manage R packages (CRAN + git): rig.r-lib.org/pkg-guide.html - new: manage R projects and virtual environments: rig.r-lib.org/proj-guide.h...

quarto-hub is really coming together, y'all! I'm so excited to share some of this with you at conf next week. Check out our upcoming collaborative wysiwyg editor working on a fully-styled Quarto 2 page:

I've been working in Markdown and YAML a lot lately, and ended up building Yamark, a fast formatter for both. With LLMs, Markdown + YAML feel like programming languages. I wanted the same kind of tooling for them that I'm used to with code. t-kalinowski.github.io/yamark/

@posit.co Positron Server is now free for academic JupyterHub with a teaching license. Students get a full data science IDE (Python/R, debugger, data viewer) in-browser, no install needed. blog.jupyter.org/positron-ser...

I'm happy to share `ir`, a new command-line tool for running portable R scripts and Quarto documents. It's inspired by my two favorite parts of `uv`: self-describing scripts and tools you can run without installing first. opensource.posit.co/blog/2026-07...

🛡️ Tutorial Spotlight: @cpsievert.bsky.social walks you through building LLM apps that actually work in production. Learn querychat and dodge hallucinations, verifiability issues, and other pitfalls. From cool demo to reliable tool 🧠 #SciPy2026 🔗 scipy2026.scipy.org

Using LLM chat in a browser interface is just the beginning. You can unlock so much more power programmatically! At Pyladies Monterrey, I spoke about chatlas, a lightweight library that connects #Python with LLMs. Check out the slides and summary (in 🇪🇸 and 🇬🇧): ivelasq.rbind.io/talk/connect...

That's a wrap, #PyConUS! I loved all the conversational talks, documentation writing, and PRS this week. If you missed the #python dashboarding tutorial using Shiny, I have all my materials here: chendaniely.github.io/pycon-2026-s... If you missed it, hopefully I'll catch you at #SciPy in July!

The newest release of Posit Assistant, an agent for coding and data analysis, includes a "data cleaning mode." When enabled, the agent will run quality checks and surface decisions about e.g. import issues, factor levels, etc to the user. In the AI Newsletter: opensource.posit.co/blog/2026-05...

Announcing posit::glimpse() May 2026! ✨ Key open-source updates for #RStats, #Python, and now #SQL: 📊 ggsql: Grammar of graphics for SQL 🤖 raghilda: Simplified RAG in Python 🔭 Shiny + pointblank: Built-in OpenTelemetry support 🦀 Quarto 2: A Rust-based future Read more: posit.co/blog/2026-05...

I'm very excited to give my first ever PyLadies talk with PyLadies Monterrey on "Connecting #Python with LLMs"! We'll be exploring chatlas as a lightweight way of working with AI 🐍 📆 Sat, May 9 | 12:30pm CT Hope to see you there! Registration link: docs.google.com/forms/d/e/1F...

I am excited beyond description to lift the veil on what we have been working on in 2026: Please meet ggsql! A new extension of the SQL language for creating visualisations using the grammar of graphics. Read all about it in the blog post or visit the website at ggsql.org

Shiny for Python 1.6 is out! Two big additions: toolbar components for compact, modern UIs (thank you, @enelson5.bsky.social!) and built-in OpenTelemetry support for production observability. Zero Shiny changes required w/ usual OTel config. `pip install -U shiny` 🔗: shiny.posit.co/blog/posts/s...

Quarto v1.9 is out! We'll have an announcement blog post soon, but quarto.org/docs/download/ has the main highlights, including: - PDF accessibility in latex and typst - llms.txt support - third-party engine extensions Give it a whirl, and thanks!

Our list of 2026 #rstats and #python summer internships has been posted. We can't wait to work with you and make great things! tidyverse.org/blog/2026/03...

Shiny for R v1.12 is here with built-in OpenTelemetry support! 🎉 Trace sessions and reactive calculations in production with zero code changes. Just install {otel}/{otelsdk} and set your env vars. Learn more: shiny.posit.co/blog/posts/s... #RStats #RShiny #OpenTelemetry

I am super hyped to finally share the first release of plumber2 with all of you. This has been the center of my attention for a big part of 2025 and I hope you'll find it a worthy update to the venerable plumber package. The blog post will tell you more #rstats

On the blog: building an AI-powered location explorer with Shiny and Claude Intrigued by apps you’ve seen that bridge GIS and LLMs? You can build them yourselves in #rstats! Read the post: walker-data.com/posts/ai-loc...

Announcing Orbital for Python! For Scikit-learn users, this tool transforms your ML pipelines into SQL queries, letting predictions run directly in your database without a #Python environment. Learn more: posit.co/blog/introdu...

At Posit, we love @typst.app: ⚡ Make PDFs in milliseconds, not minutes ✨ The power of LaTeX with today's technologies ✍️ Modern typography (including emojis!) 🧠 Clear mental model So I'm thrilled to announce that we're now supporting its development: posit.co/blog/posit-a... #rstats

Risky post! (This is great, fun to read and the frustrated tone throughout really does capture how it feels sometimes to be an experienced programmer trying to argue that "LLMs are actually really useful" in many corners of the internet)

Wow, this talk-to-the-data #RStats dashboard of terminated #NSF grants is really something.

Shiny v1.4 is now on PyPI! 🎉 Highlights include bookmarking and new Generative AI documentation. 🔖🤖 Read here for more. 👀 shiny.posit.co/blog/posts/s...

Want to work with me on the Shiny team at @posit.co alongside @jcheng5.bsky.social @winstonchang.bsky.social @schloerke.bsky.social @grrrck.xyz? We're looking for another engineer, apply here posit.co/job-detail/?... #rstats #rshiny #ShinyConf #python #pydata

Slides from my #ShinyConf talk earlier today: "LLM-Powered Shiny apps with ellmer and chatlas" docs.google.com/presentation... #rstats #rshiny #python #ai

We are thrilled to announce chatlas, a Python package that simplifies working with large language models (LLM) in Python! Chat, tool call, stream API calls, RAG, and more, with developer details like typing support and rich console output. Read the post: posit.co/blog/announc... #Python #AI

We're excited for #ShinyConf2025! Posit's Carson Sievert will talk about "Building LLM-Powered Shiny apps via ellmer and chatlas" Learn more and see the full agenda at www.shinyconf.com/agenda. #RShiny #ShinyForPython #rstats

Test BFGS, Nelder-Mead & other numerical optimization algorithms on classic functions like Rosenbrock & Ackley. Compare paths & landscapes in real-time. Built with #rstats #rshiny 🔗 App: shiny.thecoatlessprofessor.com/numerical-op... 💻 Code: github.com/coatless-shi...

Recently I've been working on getting #polars running in #pyodide. This was a fun one, even requiring patches to LLVM's #wasm writer! Everything has now been upstreamed and earlier this week Pyodide v0.27.0 released, including a Wasm build of Polars usable in Pyodide, Shinylive and Quarto Live 🎉

Great work by @halleeshearer.bsky.social in her first first-author paper. With 🎀 shiny app 🎀 to explore how FC reliability fares ACROSS DIFFERENT movies versus rest, region-by-region. Thanks @sneuroble.bsky.social @tingsterx.bsky.social @ninetlab.bsky.social for 👍 collab. doi.org/10.1162/imag...

I finally tried the {shinychat} #RStats 📦 and it's nice to see LLM streaming responses in an R Shiny app! By @jcheng5.bsky.social & @cpsievert.bsky.social at @posit.co github.com/posit-dev/sh... #RShiny #GenAI 1/2

I've been working with a variety of #LLM / #GenAI interfaces in #Python, but I haven't found one that does exactly what I need in a streamlined way. The new chatlas package from Posit may be just that. It supports multiple providers, structured data outputs, and more! posit-dev.github.io/...