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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!

What It's Like to Lead an Engineering Org: Thoughts on "CTO in the Loop"

https://www.mooreds.com/wordpress/archives/3745
2•mooreds•4m ago•0 comments

Some writing keeps traveling and I can't predict which

https://www.tsoon.com/posts/writing-that-travels/
1•mooreds•4m ago•0 comments

Cloudflare Internal DNS is now generally available – The Cloudflare Blog

https://blog.cloudflare.com/internal-dns/
1•corvad•8m ago•0 comments

DOJ Probes Harvard Financial Aid, Alleging China Donor Influence

https://www.bloomberg.com/news/articles/2026-07-20/doj-probes-harvard-financial-aid-with-focus-on...
2•petethomas•10m ago•0 comments

OpenAI Appears to Be Missing Its Sales Goals by a Margin

https://futurism.com/artificial-intelligence/openai-ad-revenue-ai-advertising-financial-projection
4•enraged_camel•13m ago•0 comments

GPT-5.6 Sol vs. Kimi K3 Speedrunning Kerbal Space Program Live

https://www.twitch.tv/vals_ai
8•huwng•17m ago•1 comments

Fast UTF-8 handling for modern C++ with support for legacy C

https://developforperformance.com/FastUtf8.html
1•kirk_krauss•18m ago•1 comments

Received a Vivek Shah CIPA Demand Letter? Don't Pay Yet

https://www.jdsupra.com/legalnews/received-a-vivek-shah-cipa-demand-7982240/
2•richartruddie•23m ago•1 comments

Fretengine: Visualize chord and scale relationships on the guitar fretboard

https://app.fretengine.com/
1•leftoaklabs•25m ago•1 comments

Can AI agents use ur site?

https://github.com/Open-Ingress/OpenIngress
5•manupareekk•29m ago•9 comments

Liviu Librescu

https://en.wikipedia.org/wiki/Liviu_Librescu
2•stmw•30m ago•0 comments

'More stable than real estate': How software's reliable revenue started to crack

https://www.9fin.com/insights/more-stable-than-real-estate
1•petethomas•30m ago•0 comments

Disabling Siri

https://www.coryd.dev/posts/2026/disabling-siri
1•cdrnsf•31m ago•0 comments

I rid myself of short form media

https://tcotc.dev/weekly/2026-w28/
1•willx86•32m ago•0 comments

Show HN: CheapStack – affordable dev starter kits and boilerplates

https://cheapstack.dev
2•makbar890•36m ago•0 comments

Algorithm Aversion

https://en.wikipedia.org/wiki/Algorithm_aversion
2•cainxinth•36m ago•0 comments

Claude Fable is stylistically closer to Kimi K3 than Claude Opus

https://slopidx.com/models/claude-fable-5
1•zetrk•36m ago•1 comments

US administration considering ban on Chinese open source AI models

https://www.axios.com/2026/07/20/ai-us-china-open-source-kimi
6•anigbrowl•36m ago•1 comments

OpenAI Appears to Be Missing Its Sales Goals by a Vast Margin

https://futurism.com/artificial-intelligence/openai-ad-revenue-ai-advertising-financial-projection
2•pier25•37m ago•0 comments

The Messy Reality of AI Transformation

https://seasonedleadership.substack.com/p/the-messy-reality-of-ai-transformation
1•mooreds•45m ago•0 comments

Jan – Open-Source ChatGPT Replacement

https://www.jan.ai/
1•jantissler•46m ago•1 comments

The Cartel Olympics

https://www.theatlantic.com/magazine/2026/05/mexico-cartel-la-union-tepito/686453/
2•cdrnsf•46m ago•0 comments

Donation Controversy

https://mullvad.net/en/blog/donation-controversy
13•Cider9986•48m ago•8 comments

US imposes new 50% tariffs on some Canadian products

https://www.reuters.com/business/us-imposes-new-50-tariffs-canadian-products-2026-07-20/
14•JumpCrisscross•50m ago•3 comments

You're not ambitious enough with Claude

https://twitter.com/christinexzhu/status/2074847461588267466
1•gmays•53m ago•0 comments

Pregnant Womans Roadside Death Triggers Push to Reopen Mississippi DeltaHospital

https://kffhealthnews.org/rural-health/rural-mississippi-delta-hospital-desert-pregnant-woman-die...
5•Jimmc414•53m ago•0 comments

Tell HN: TIL accessing old.reddit.com now requires accounts

5•nanis•54m ago•3 comments

Designing an Ethernet Switch ASIC

https://essenceia.github.io/projects/ethernet_switch_asic/
1•random__duck•56m ago•0 comments

Show HN: Seek – Ctrl+F for Videos

https://seekapp.cc
2•surprisefox•56m ago•1 comments

Parsifal and The Muppet Movie are the only two genuine Gesamtkunstwerke

https://morbidcuriosity.substack.com/p/enthullet-die-rainbow-connection
1•pnwpnw•56m ago•0 comments