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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•10mo 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!

Tell HN: Reddit Seems to Be Down

1•forlorn•53s ago•0 comments

The Edwardian builder who had changed how we keep time

https://www.bbc.com/news/articles/cd9vxg95ze2o
1•speckx•1m ago•0 comments

Scientists identify 'neural fingerprint' of psychedelic drugs in the brain

https://www.theguardian.com/science/2026/apr/06/scientists-identify-neural-fingerprint-of-psyched...
1•tmnvix•1m ago•0 comments

Refactoring Untested Code

https://yusufaytas.com/refactoring-untested-code/
3•kakerane•2m ago•0 comments

Open AI to give up to $100k and up to $1M in API credits

https://openai.com/index/industrial-policy-for-the-intelligence-age/
2•ageofattention•6m ago•0 comments

Poolside hunts data centre partners after CoreWeave deal falls through

https://www.ft.com/content/24168508-e2a1-447d-b1a0-44a0be0c0550
1•MasterScrat•6m ago•1 comments

Building an AI Companion with Perfect Memory

https://cortexdb.ai/blog/building-ai-companion
1•prmalik•8m ago•0 comments

Dupes vs. Originals: CT Scans Reveal What's Inside

https://www.lumafield.com/scan-of-the-month/dupes
2•viasfo•8m ago•1 comments

Some Contemporary Heresies

https://kevinkelly.substack.com/p/some-contemporary-heresies
1•jger15•11m ago•0 comments

Isaac Asimov on 1984

https://redsails.org/asimov-on-1984/
1•cybersoyuz•11m ago•0 comments

Netflix launches new gaming app for kids called Netflix Playground

https://www.latimes.com/entertainment-arts/business/story/2026-04-06/netflix-playground-expands-f...
1•andsoitis•12m ago•0 comments

Pacific West (Reno, NV or Remote) – Systems / Software Architect (Exploratory)

https://pacificwestcompanies.com/
1•philhow•13m ago•1 comments

No on-site doctor: Dental student died in ICU overseen by remote tele-health MD

https://lawandcrime.com/lawsuit/no-on-site-doctor-dental-student-died-in-icu-overseen-by-remote-t...
3•randycupertino•17m ago•1 comments

A local LAN radio station that gives you ambient audio awareness of your agents

https://radioagent.live/
1•nmelo•17m ago•0 comments

Londoners are sick of viral videos telling lies about their city

https://www.londoncentric.media/p/london-crime-viral-videos-crime
2•pseudolus•18m ago•0 comments

The Cult of Vibe Coding Is Insane

https://bramcohen.com/p/the-cult-of-vibe-coding-is-insane
13•drob518•19m ago•0 comments

A visual guide to Iran's coastline and strategic islands

https://interactive.aljazeera.com/aje/2026/iran-coastline-islands/
1•atlasunshrugged•20m ago•1 comments

Jaguar: We Will Be 'Exclusively Electric'

https://www.motor1.com/news/792058/jaguar-rawdon-glover-interview/
2•randycupertino•20m ago•0 comments

China stands to benefit most from the war-driven energy crisis

https://www.washingtonpost.com/world/2026/04/06/iran-war-china-renewable-energy/
2•CamelCaseCondo•20m ago•1 comments

Agent Retro: post-session retrospectives for coding agents

https://github.com/giannimassi/agent-retro
1•tidymince•21m ago•0 comments

Orca – moving beyond prompt-based agents

https://github.com/gfernandf/agent-skills
1•gfernandf1•22m ago•0 comments

Bored of Scrolling ChatGPT and Gemini

https://www.trydraft.app/
1•0xNishchit•22m ago•0 comments

AI helps add 10k more photos to OldNYC

https://www.danvk.org/2026/03/08/oldnyc-updates.html
3•evakhoury•26m ago•0 comments

The Sales Learning Curve (2006)

https://hbr.org/2006/07/the-sales-learning-curve
1•wslh•28m ago•0 comments

Suno is a music copyright nightmare

https://www.theverge.com/ai-artificial-intelligence/906896/sunos-copyright-ai-music-covers
1•cdrnsf•29m ago•0 comments

Nvidia Pascal Turns 10

https://videocardz.com/newz/nvidia-pascal-turns-10-the-architecture-that-gave-us-geforce-gtx-1080-ti
2•LorenDB•29m ago•0 comments

Antibacterial properties of birch tar and its medicinal use in the Pleistocene

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0343618
2•PaulHoule•29m ago•0 comments

The Legal and Policy Fallout from Data Center Strikes in the Middle East War

https://www.techpolicy.press/the-legal-and-policy-fallout-from-data-center-strikes-in-the-middle-...
2•rbc•30m ago•0 comments

VibeFocus – An open source portfolio manager for too many vibe-coded projects

https://vibefocus.ai
1•ericblue•30m ago•0 comments

Teardown of unreleased LG Rollable shows why rollable phones aren’t a thing

https://arstechnica.com/gadgets/2026/04/teardown-of-unreleased-lg-rollable-shows-why-rollable-pho...
1•LorenDB•30m ago•0 comments