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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•11mo 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!

Music with Lyrics Interferes with Cognitive Tasks (2023)

https://journalofcognition.org/articles/10.5334/joc.273
1•XzetaU8•1m ago•0 comments

Show HN: Git Shield – local hooks for secrets and PII

1•veke87•3m ago•0 comments

US lawmakers vote to reduce NSF funding by 20%

https://www.nature.com/articles/d41586-026-01427-6
2•warbaker•4m ago•0 comments

A more efficient implementation of Shor's algorithm

https://lwn.net/Articles/1066156/
1•signa11•7m ago•0 comments

Show HN: Global DNS record propagation visualization

https://www.tidelock.dev/dns/propagation
1•vojtechrichter•15m ago•0 comments

Special-Use Domain 'home.arpa.' (2018)

https://www.rfc-editor.org/rfc/rfc8375.html
1•rdpintqogeogsaa•16m ago•0 comments

OpenClaw Got Safer in Public

https://openclaw.ai/blog/openclaw-security-in-public
1•jacobtomlinson•20m ago•0 comments

Forget Ambition: A Case for Hopeless Creativity

https://www.youtube.com/watch?v=JdlagZ2iDgU
2•stuaxo•21m ago•0 comments

China Planted 78B New Trees Affecting Its Water Cycle

https://www.popularmechanics.com/science/environment/a71126116/china-reforesting-changes-hydrology/
3•kaptain•22m ago•0 comments

My local agentic dev setup today

https://willemvandenende.com/blog/engineering/my-local-agentic-dev-setup-today
2•ColinEberhardt•32m ago•0 comments

Exclusive eBook: Inside the stealthy startup that pitched brainless human clones

https://www.technologyreview.com/2026/04/30/1136684/exclusive-ebook-inside-the-stealthy-startup-t...
2•joozio•33m ago•0 comments

Lightweight OpenCode profile for routine dev work with focused agents

https://github.com/gc-victor/supersimple
1•gcv•36m ago•0 comments

I Built GeoGuesser but for Guns

https://gunguesser.com
2•salad-vr•37m ago•3 comments

Show HN: Parse your chat exports to find restaurants, trips, and activity ideas

https://github.com/DocSpring/chat_to_map
1•nathan_f77•39m ago•0 comments

Ubuntu / Canonical Launchpad Down

https://status.canonical.com/
2•tankenmate•40m ago•1 comments

'Completely horrible': UK job hunters share frustration with AI interviews

https://www.theguardian.com/technology/2026/may/01/uk-job-hunters-frustration-ai-interviews
5•beardyw•43m ago•1 comments

SlothDB a 5X Faster Alternative to DuckDB, ClickHouse DB

1•souravroy78•44m ago•0 comments

RLS sounds great until it isn't

https://planetscale.com/blog/rls-sounds-great-until-it-isnt
1•ksec•45m ago•0 comments

Languages: We must save dying tongues (2014)

https://www.bbc.com/future/article/20140606-why-we-must-save-dying-languages
3•downbad_•47m ago•1 comments

Ask HN: Bedrock,Vertex AI etc. Support Anthropic Models

1•nethi•47m ago•0 comments

Rats free each other from cages (2011)

https://www.nature.com/articles/nature.2011.9603
3•downbad_•48m ago•1 comments

Mike Stonebraker on Disagreeing with Google, Postgres, Future Problems [video]

https://www.youtube.com/watch?v=YPObBOwIrHk
1•tosh•50m ago•0 comments

Norway: The Supreme Court dismisses all accusations against Jw

https://hrwf.eu/norway-the-supreme-court-dismisses-all-accusations-against-jehovahs-witnesses/
2•janandonly•53m ago•0 comments

Claude Code Connected to Apple Car Play and Android Auto [video]

https://www.youtube.com/shorts/edA00WNhNwM
2•johnkg003•57m ago•1 comments

Are you richer than your neighbor?

https://brokeorrich.com/
1•Mawenzi•1h ago•1 comments

It’s Toasted

https://yadin.com/notes/toasted/
19•dryadin•1h ago•9 comments

The AI supply crunch is here

https://www.economist.com/leaders/2026/04/30/the-ai-supply-crunch-is-here
3•pingou•1h ago•1 comments

Barbara Liskov on Dijkstra, Abstraction, Distributed Systems [video]

https://www.youtube.com/watch?v=T9CGjbPZeaM
1•tosh•1h ago•0 comments

U.S. Seizes $15B in Bitcoin in Crypto 'Scam' Crackdown

https://www.forbes.com/sites/martinacastellanos/2025/10/14/us-seizes-15-billion-in-bitcoin-sancti...
1•maxloh•1h ago•2 comments

Monopoly Concepts in Microeconomics: De Beers and Diamond Industry

https://www.studocu.com/in/document/university-of-johannesburg/microeconomic-issues-in-developmen...
1•cathrinea•1h ago•0 comments