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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!

Ask HN: How do you do invoicing?

1•lasvejas•18s ago•0 comments

Show HN: I tracked 47 flights with a smart ring to quantify IMSAFE's blind spot

https://jay9185.github.io/Ultrahuman-heatmaps/
1•jerr12939•24s ago•0 comments

Mlibc: A fukk-featured portable C standard library

https://github.com/managarm/mlibc
1•fanf2•1m ago•0 comments

A Curl Mountain Movie

https://daniel.haxx.se/blog/2026/06/26/a-curl-mountain-movie/
1•HieronymusBosch•1m ago•0 comments

Study: One fake web page can be enough to trick AI shopping recommendations

https://www.fastcompany.com/91562049/one-fake-webpage-can-be-enough-to-trick-ai-shopping-recommen...
1•giuliomagnifico•2m ago•0 comments

Standby –> Intervention

https://seths.blog/2026/06/standby-intervention/
1•mooreds•2m ago•0 comments

I Shipped Feature So Fast Sheryl Sandberg Called an Emergency Meeting to Stop Me

https://michaelnovati.substack.com/p/i-shipped-a-facebook-feature-so-fast
1•kiyanwang•3m ago•0 comments

The Copy and the Guru

https://om.co/2026/05/26/the-copy-and-the-guru/
1•mooreds•6m ago•0 comments

The Shit Umbrella – a rant (2019)

https://medium.com/@ElizAyer/the-shit-umbrella-a-rant-3c0960f92bcb
1•mooreds•6m ago•0 comments

Fan Speed Offset Explained

https://www.noctua.at/en/expertise/tech/fan-speed-offset-explained
2•tosh•8m ago•0 comments

Show HN: Git-lazy-mount mount a repo without cloning it. Works with ordinary Git

https://github.com/mohsen1/git-lazy-mount
4•mohsen1•13m ago•3 comments

Battery-Powered Air Conditioners Take a Load Off the Grid

https://spectrum.ieee.org/battery-powered-air-conditioning
1•defrost•13m ago•0 comments

Ex-NOAA employees re-create a valuable climate data site shut down by Trump

https://www.npr.org/2026/06/26/nx-s1-5869615/climate-noaa-data-trump-doge
5•geox•13m ago•0 comments

Show HN: Kapient – Website monitoring that tells you what to fix

https://kapient.com
1•anwarfirst•13m ago•0 comments

The tick that makes you allergic to meat is spreading across Massachusetts

https://newbedfordlight.org/the-bugs-that-make-you-allergic-to-meat-are-spreading-across-mass/
1•georgecmu•14m ago•0 comments

What do people think of shadow AI? Security folk seem to love talking about it

https://old.reddit.com/r/cybersecurity/comments/1s55dw6/are_we_overfocused_on_ai_controls_while_s...
1•Ishaan0075•15m ago•0 comments

Ask HN: Who remembers Fry's Electronics – the "church" of IT people?

2•netfortius•15m ago•0 comments

Treaty of Versailles

https://en.wikipedia.org/wiki/Treaty_of_Versailles
1•chistev•17m ago•0 comments

Underpromise, overdeliver? Hands-on with the $24,950 Slate auto

https://arstechnica.com/features/2026/06/we-take-a-ride-in-slates-24950-electric-pickup/
1•rbanffy•17m ago•0 comments

Polymarket says hackers stole users' funds

https://techcrunch.com/2026/06/25/polymarket-says-hackers-stole-users-funds/
2•croes•18m ago•0 comments

Show HN: LWDT – A Zephyr-inspired device-tree framework for ESP-IDF

https://github.com/oldrev/lwdt
2•oldrev•19m ago•0 comments

Marine expedition uncovers 31 new species in two weeks

https://www.theguardian.com/environment/2026/jun/26/marine-expedition-uncovers-31-new-species-two...
1•tosh•20m ago•0 comments

Volkswagen weighs up to 100k job cuts and four plant closures

https://www.reuters.com/business/autos-transportation/volkswagen-ceo-aims-cut-up-100000-jobs-next...
2•theanonymousone•20m ago•0 comments

Modern GPU Programming Book

https://mlc.ai/modern-gpu-programming-for-mlsys/index.html
1•fuy•20m ago•1 comments

Why Are Women Different? (1995)

https://www.cs.ucdavis.edu/~vemuri/EngPopsci/women.htm
1•jruohonen•21m ago•0 comments

Context engineering: shifting from "tokenmaxxing" to deliberate curation

https://corti.com/from-tokenmaxxing-to-token-discipline-the-2026-reckoning-in-ai-assisted-enginee...
2•TechPreacher•24m ago•0 comments

The Bottleneck Strikes Again

https://cutlefish.substack.com/p/tbm-427-the-bottleneck-strike-again
2•disgruntledphd2•27m ago•1 comments

Show HN: Lofinity – an endless lo-fi track, tuned to you

https://lofinity.ai
1•rouley•27m ago•0 comments

I built a global supplier discovery engine form raw materials to everything

https://suppliers.run/
1•rayluminarch•30m ago•0 comments

Show HN: Font Finder Chrome Extension

https://chromewebstore.google.com/detail/font-detector/lpgiclolinhgkampahomomlhbcngafek
1•chernikovalexey•33m ago•0 comments