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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•8mo 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!

Elon Musk floats idea of buying Ryanair after calling CEO 'an idiot'

https://www.theguardian.com/technology/2026/jan/20/elon-musk-buying-ryanair-ceo-tesla-michael-ole...
1•cycomanic•1m ago•0 comments

I rejected "Scalability" to build a logistics nightmare (works)

https://www.indiehackers.com/post/why-i-rejected-scalability-to-build-a-logistics-nightmare-that-...
1•rosiehong•4m ago•0 comments

I Burned $160k Trying to Solve "Online Tailoring"

https://www.indiehackers.com/post/how-i-burned-160-000-trying-to-solve-online-tailoring-the-engin...
1•rosiehong•5m ago•0 comments

Sam Altman's reply to Elon Musk's tweet telling people not to use ChatGPT

https://twitter.com/sama/status/2013703158459978076
2•thunderbong•8m ago•1 comments

Scientists in Dreamland

https://theamericanscholar.org/scientists-in-dreamland/
1•Hooke•11m ago•0 comments

Show HN: X Post Analyzer – Score posts using X's open-source algorithm

https://x.kano.codes
1•tonkotsuboy_com•11m ago•0 comments

App Store and Apple TV Experiencing Outage

https://www.macrumors.com/2026/01/20/app-store-apple-tv-down/
2•hughmandeville•12m ago•0 comments

Is PSA airlines network down anywhere besides DCA?

1•DubDouble•14m ago•0 comments

Ask HN: How are you sandboxing your coding agents?

2•kwar13•20m ago•4 comments

Are there laws of history? (2020)

https://aeon.co/essays/if-history-was-more-like-science-would-it-predict-the-future
1•Ariarule•21m ago•0 comments

Anthropic's original take home assignment open sourced

https://github.com/anthropics/original_performance_takehome
3•myahio•26m ago•1 comments

Mike Rowe 464: Palmer Luckey–The Department of War Has a Mullet

https://music.youtube.com/podcast/csmQqaSHJrw
2•nradov•40m ago•0 comments

Vitruvius Basilica found after 500 years

https://www.thearchaeologist.org/blog/italy-uncovers-basilica-designed-by-vitruvius-the-father-of...
2•adeltoso•41m ago•1 comments

RSS.Social – the latest and best from small sites across the web

https://rss.social/
2•Curiositry•44m ago•0 comments

Building a JavaScript runtime in one month

https://themackabu.dev/blog/js-in-one-month
2•alexinavar•44m ago•1 comments

Carney says old world order 'is not coming back'

https://www.bbc.com/news/articles/cly3d28p4p8o
7•kwar13•46m ago•2 comments

Blade Runner Costume Design (2020)

https://costumedesignarchive.blogspot.com/2020/12/blade-runner-1982.html
1•exvi•46m ago•0 comments

Yes, I Love Ops: Because We Do Not Fear Production

https://mollysheets.com/2023/04/15/yes-i-love-ops/
2•mooreds•48m ago•0 comments

Chinese EVs Blow Past Tesla and Tariffs En Route to Global Reign

https://www.wsj.com/business/autos/china-cars-tariffs-byd-tesla-fa18066f
3•JumpCrisscross•49m ago•0 comments

Wasabi Raises $70M in New Equity

https://wasabi.com/company/newsroom/press-releases/wasabi-raises-70m-in-new-equity-to-power-the-n...
1•marc__1•49m ago•0 comments

Macaronis and the New Romantics: Making my 18th Century 'Macaroni' wig (2015)

https://revolutionarycostumes.blogspot.com/2015/03/making-18th-century-macaroni-wig.html
1•exvi•51m ago•0 comments

SubtleCrypto: GenerateKey() Method

https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/generateKey
4•mooreds•52m ago•1 comments

Humans in the Loop

https://robbyonrails.com/articles/2026/01/20/humans-in-the-loop/
2•mooreds•53m ago•0 comments

Show HN: Wearable data and meal pics → a real coach adjusts plan every week

https://helloformafit.com/
1•nemath•55m ago•0 comments

How long do you think? I give it 3 years

4•hmokiguess•55m ago•3 comments

Humans&

https://humansand.ai/
2•flinner•56m ago•0 comments

AI startup Humans& raises $480M at $4.5B valuation in seed round

https://www.reuters.com/business/ai-startup-humans-raises-480-million-45-billion-valuation-seed-r...
2•flinner•57m ago•0 comments

"AI has taught us that people are excited to replace human beings"

https://www.theguardian.com/technology/2026/jan/19/ed-zitron-on-big-tech-backlash-boom-and-bust-a...
2•Brajeshwar•57m ago•0 comments

Outliner

https://outliner.com/
1•handfuloflight•58m ago•0 comments

Australia criminalises hurting feelings [video]

https://www.youtube.com/watch?v=VskqOgr1OtU
1•hekkle•1h ago•0 comments