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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!

A dataset hub for LLM serving research

https://data.freeinference.org/
1•Anon84•1m ago•0 comments

MCP was always a bad idea?

https://simonwillison.net/2026/Sep/20/hn-49779718/
1•hnp9j9qtda•3m ago•0 comments

Ask HN: Business Logic in the Database?

1•boxesnlines•3m ago•0 comments

EU Transformative AI Strategy

https://transformative-ai.eu/
1•cc62cf4a4f20•4m ago•0 comments

Simurg – Kills LLM hallucinations mid-stream, with free web search built in

https://huggingface.co/MergenAI/SIMURG
1•lebagetdefrance•4m ago•0 comments

Show HN: Matcha – fresh job postings pulled directly from company career pages

https://matchajobs.co/
1•jpercy•7m ago•1 comments

The backend that ran every game we made, ten years and counting

https://www.m2h.nl/writing/the-toolkit-behind-ten-years-of-games/
1•MikeHer•9m ago•0 comments

Named and optional function arguments might be awesome in Rust

https://botahamec.dev/named-optional-args
1•fanf2•9m ago•0 comments

Built a Memory-Test Game Inspired by the Chimp Test

https://puzznest.com/memory-test
1•puzznest•11m ago•0 comments

Show HN: OmniUil AI – PQC Scanner/Taint Analysis and Migration Intelligence Rust

https://github.com/Uilcol/omniuil-ai
1•UilCol•12m ago•0 comments

Reupsell – AI Product Accessories for Shopify

https://apps.shopify.com/reupsell
1•motion-hero•15m ago•0 comments

The Hyperlocal Customs of the Country

https://www.nytimes.com/2026/09/05/opinion/unique-american-local-festivals.html
1•paulpauper•15m ago•0 comments

Analyzing Jev, a new AI model

https://blog.senko.net/analyzing-jev-a-new-ai-model
1•taubek•15m ago•0 comments

Solitaire Alone Together

https://solitairealonetogether.com/
1•fratellobigio•15m ago•0 comments

Could Latin become Europe's common language? A young group thinks it can

https://www.lrt.lt/en/news-in-english/19/3055161/could-latin-become-europe-s-common-language-a-yo...
1•paulpauper•15m ago•0 comments

DotFly – a fruit fly's brain, simulated in C#

https://kokosa.dev/blog/2026/dotfly/
1•stared•16m ago•0 comments

Banning self-recursive improvement in AI models?

https://marginalrevolution.com/marginalrevolution/2026/09/banning-self-recursive-improvement-in-a...
1•paulpauper•16m ago•0 comments

Parallel Algorithms [pdf]

https://www.cs.cmu.edu/~guyb/paralg/paralg/parallel.pdf
1•Ir0n•16m ago•0 comments

Putin's party would have won only 34% without ballot stuffing, analysis suggests

https://novayagazeta.eu/en/articles/2026/09/22/putin-s-party-would-have-won-only-34-without-ballo...
2•giuliomagnifico•19m ago•0 comments

Type Punning in C and C++

https://blog.pwkf.org/2026/09/21/correct-type-punning-in-c.html
6•ingve•21m ago•0 comments

God told them to sell crypto. Their investors lost everything

https://www.technologyreview.com/2026/09/10/1143588/indxcoin-god-regalados-sell-crypto-investors-...
1•Geekette•24m ago•0 comments

Show HN: Bidslot – one screen, sold by the minute, anyone can take it from you

https://bidslot.io
1•honzaaap•24m ago•1 comments

Show HN: Dvd.club – a community Blu-ray and DVD lending library

https://www.dvd.club/
1•ShinyCyril•26m ago•0 comments

Sunrise due east from everywhere on Earth, 23 September 2026

https://pilgrimapp.org/sunpath/2026-autumn-equinox/
1•momentmaker•26m ago•0 comments

It's Trump's world, and he's accelerating its chaos

https://www.cnn.com/2026/09/22/politics/trump-un-general-assembly-speech
4•dat999zx•28m ago•1 comments

Working-Class Taxpayers Subsidize Billionaires' Climate-Killing Private Jets

https://www.commondreams.org/news/taxpayer-dollars-to-private-jet
2•DefNotAiForSure•28m ago•0 comments

AV1Converter 3.0

https://github.com/framicheli/av1converter
1•francescomi•29m ago•0 comments

PanTilt–desk pan-tilt tracker on Nim+ORT/OpenVINO+Nano(I debug on apples)

https://github.com/olesha-ai/pan-tilt-ai-tracker
1•olesha-ai•31m ago•0 comments

Red5 and Ezdrm Team to Streamline Delivery of Content

https://www.red5.net/blog/red5-and-ezdrm-streamline-delivery-of-content-security/
1•mondainx•31m ago•0 comments

New England RetroFest and the Maine Vintage Computer Society

https://www.goto10retro.com/p/new-england-retrofest-and-the-maine
1•rbanffy•31m ago•0 comments