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Show HN: Reaktiv – I built Excel-like reactive programming for Python

https://bui.app/when-frontend-reactivity-meets-backend-python-the-story-of-my-first-1-000-download-library/
2•buibuibui•1y ago
Hi HN! I created Reaktiv, a Python library bringing reactive programming to the backend world that recently hit 1,000+ monthly downloads.

I'm actively promoting it because I believe signal-based reactivity (a concept that spread rapidly in frontend development) has huge untapped potential in Python. My breakthrough came when I stopped describing it as "Angular signals for Python" and started calling it "Excel-like computation graphs" - suddenly Python developers understood the value.

The library automatically tracks dependencies between computations, only recalculating values when dependencies change. This eliminates manual dependency tracking, prevents synchronization bugs, and reduces cognitive load when managing complex state.

Interestingly, I've noticed some initial interest from data scientists, though I'm still exploring what specific problems it might solve for them. I also believe the Home Assistant/IoT communities could benefit greatly from this approach.

Would love your thoughts on bringing frontend patterns to backend development!

AI digital sovereignty risk doesn't exist

https://pluralistic.net/2026/06/18/their-trillions-our-billions/
1•hn_acker•1m ago•0 comments

Project Valhalla Explained: How a Decade of Work Arrives in JDK 28

https://www.jvm-weekly.com/p/project-valhalla-explained-how-a
2•theanonymousone•1m ago•0 comments

Garmin Needs to Do Better

https://mijndertstuij.nl/posts/garmin-needs-to-do-better/
1•jandeboevrie•2m ago•0 comments

Astronauts on the ISS drill a hole through the pressure hull

https://twitter.com/DJSnM/status/2067106583042269522
2•vmg12•5m ago•0 comments

SSH port knocking with OpenBSD 7.9

https://dgl.cx/2026/06/ssh-port-knocking-with-openbsd
1•jandeboevrie•5m ago•0 comments

One of the best C++29 features is available?

https://www.meetingcpp.com/blog/items/One-of-the-best-Cpp29-features-is-already-available-.html
1•jandeboevrie•7m ago•0 comments

Ask HN: How do you effectively communicate or present?

2•hnthrow10282910•9m ago•0 comments

The AI subsidy is ending, and waste is about to become a line item

https://www.speakeasy.com/blog/rising-price-of-ai
1•mooreds•9m ago•0 comments

Writing a Keyboard Disabler for macOS

https://idian.io/posts/2026/writing-a-keyboard-disabler-for-macos/
1•idianal•9m ago•0 comments

That Untravell'd World

https://www.hyperdimensional.co/p/that-untravelld-world
1•yurivish•10m ago•0 comments

A website that consolidates degree apprenticeships from across the web

https://www.apprentifinder.co.uk/browse
1•adamofeden•10m ago•0 comments

Show HN: A photography app with nicer colors

https://testflight.apple.com/join/4YYy1yhR
1•Marius77•11m ago•0 comments

G7 aims to see China supply no more than 60% of rare earths

https://www.mining.com/web/g7-aims-to-see-china-supply-no-more-than-60-of-rare-earths/
3•ironyman•11m ago•0 comments

Hacked POS terminals as live instruments and Open source browser interfaces

https://vlasvlasvlas.github.io/interfaces/
1•posnetes•12m ago•0 comments

My anxiety about layoffs has settled

https://twitter.com/romuloalves/status/2067653158176800771
1•romuloalves•12m ago•0 comments

Bezos Called Post His Worst Investment and Staff He Laid Off 'Terrible' People

https://gizmodo.com/jeff-bezos-called-washington-post-his-worst-investment-and-staff-he-laid-off-...
3•moonka•13m ago•0 comments

Barack Obama has built a monument to himself

https://economist.com/culture/2026/06/18/barack-obama-has-built-a-monument-to-himself
1•andsoitis•13m ago•0 comments

WhatsApp for Windows WebView2 inefficiencies and performance issues

https://www.windowslatest.com/2026/06/13/whatsapp-is-eating-1-2gb-ram-on-windows-11-even-as-micro...
1•alok-g•15m ago•0 comments

Physical AI lab automation investment thesis

https://skydeckconnect.com/telescope-innovations-telif
1•hairoglyphics•17m ago•0 comments

The Stock Manipulator's Sneaky Math to Beat Chaos [video]

https://www.youtube.com/watch?v=-jF9gW2r_bk
1•CGMthrowaway•20m ago•0 comments

Getting over the Nebulosity of Agents

https://text-incubation.com/getting-over-the-nebulosity-of-agents?1
1•krrishd•21m ago•0 comments

IP Crawl: Exposing the Open Webcam Crisis

https://alec.is/posts/ip-crawl-exposing-the-massive-open-webcam-crisis/
1•arm32•21m ago•0 comments

Show HN: A website to understand and study AI papers

https://intuitivepapers.ai/
1•skzv•23m ago•0 comments

'Popa' Botnet Linked to Publicly-Traded Israeli Firm

https://krebsonsecurity.com/2026/06/popa-botnet-linked-to-publicly-traded-israeli-firm/
3•gpi•23m ago•0 comments

Show HN: Agirails – Two AI agents negotiated and settled USDC payment over email

https://www.agirails.io/cases/email-escrow/
1•dmujic•23m ago•0 comments

Global Leyline Simulator

https://maps.leylines.net
1•nephihaha•25m ago•1 comments

Show HN: Maiweb – a personalized feed of the public web

https://maiweb.up.railway.app/
1•rcanand2025•25m ago•0 comments

Just Co-Locate Data in Postgres

https://www.dbos.dev/blog/co-locating-workflow-state-with-your-data
1•KraftyOne•27m ago•0 comments

I Play Video Games with Spinal Muscular Atrophy

https://www.openassistivetech.org/how-i-actually-play-video-games-with-sma-the-tools-i-use-every-...
2•dannyobrien•28m ago•2 comments

A Deadly Outbreak of Plague

https://www.nytimes.com/2026/06/17/science/oldest-plague-siberian-skeletons.html
1•janandonly•28m ago•0 comments