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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!

Dev Notes and Small Tools

https://news.ycombinator.com/user?id=oliversant
3•freyamar•6m ago•2 comments

Rocky Linux Creator Built a New 'Not Linux' Kernel in 11 Days Using AI

https://github.com/gmkurtzer/ginux
2•signa11•7m ago•0 comments

Reliably aligning LLMs is impossible in principle

https://www.seangoedecke.com/alignment-is-impossible/
2•random42•8m ago•0 comments

Small Tools and Dev Notes

https://news.ycombinator.com/user?id=sofia84
3•tomasfelix•10m ago•2 comments

The Smartest People in AI Believe This Is the Most Important Chart

https://www.wsj.com/tech/ai/ai-anthropic-rsi-recursive-self-improvement-bff4e815
2•fortran77•14m ago•1 comments

Kairos: Open-source, real-time fraud and risk decisioning

https://github.com/finic-ai/kairos
2•citguru•16m ago•0 comments

Dialogic Systems Without a Truth Criterion: Epistemology, Regulatory Strategy

https://medium.com/@smoking2man/dialogic-systems-without-a-truth-criterion-epistemology-regulator...
2•Aldus551•16m ago•0 comments

Show HN: Open-sourced alternatives to every SaaS tool

https://www.saasalternatives.online
2•macgirlt•24m ago•0 comments

Auth0 Alternatives: 6 Options Compared (Including Open Source)

https://seliseblocks.com/blog/auth0-alternatives-6-options-compared-including-open-source
1•meherabhossain•25m ago•0 comments

TrustSlot – A marketplace for independent website ad slots

https://trustslot.app
1•markriplabs•33m ago•0 comments

The Bottlenecks for AI-Driven System Design: why Principals are not yet obsolete

https://maheshba.bitbucket.io/blog/2026/07/22/agentdesign.html
1•porridgeraisin•35m ago•0 comments

Amazon plans to start selling Trainium AI chips outside AWS

https://twitter.com/wallstengine/status/2115933466361753652
3•krembo•37m ago•0 comments

GDPx: The General Agentic Benchmark

https://gdpx.semianalysis.com/
1•giuliomagnifico•40m ago•0 comments

FreeToken: Datacenter-class intelligence on the hardware you own

https://arxiv.org/abs/2608.16157
2•lioeters•43m ago•1 comments

We have lift off: building a Gemini server in Python

https://www.willmunn.xyz/gemini/python/2026/10/16/we-have-lift-off.html
1•will_munn•46m ago•0 comments

9 dead after Learjet crashes in Florida

https://nypost.com/2026/11/01/us-news/2m-learjet-60-crashes-near-palm-beach-florida/
2•metadat•49m ago•0 comments

Show HN: AI System Design Primer

https://github.com/daneb/ai-system-design-primer/
1•danebalia•54m ago•0 comments

Resolving 3-SAT in Linear Time via Macro-Switch Implication Graphs

https://zenodo.org/records/23855969
1•RudraCS•1h ago•0 comments

Future of Software

https://blog.ianhsiao.me/future-of-software-ii
2•_mad_eye_•1h ago•0 comments

Httpd 2.4

https://downloads.apache.org/httpd/CHANGES_2.4
1•lsferreira42•1h ago•0 comments

My first open-source service reached its first 20 stars on GitHub

https://github.com/embedcatalog/embedcatalog
1•aanthonymax•1h ago•1 comments

The Little Book of Semaphores

https://greenteapress.com/wp/semaphores/
2•dboon•1h ago•0 comments

What Does Your Data Reveal About Sports Betting Apps? Help ProPublica Find Out

https://projects.propublica.org/sports-betting-uploader/
2•toomuchtodo•1h ago•0 comments

Midgarth Quest. Browser-Playable Mmorpg Written by AI

https://midgarth.quest/
1•anacrolix•1h ago•1 comments

Show HN: Wikihack – HackerTube, but for Wikipedia articles mentioned on HN

https://wikihack.netlify.app
8•aizk•1h ago•0 comments

Why Don't We Live in an Art Nouveau World?

https://asteriskmag.com/issues/16/why-don-t-we-life-in-an-art-nouveau-world
1•shcallaway•1h ago•0 comments

CEPO: General Framework for Improving Prompt Optimization in Multi-Agent Systems

https://arxiv.org/abs/2610.34722
2•matt_d•1h ago•0 comments

Chambers

https://chambers.gross.is
2•endtwist•1h ago•0 comments

Linux Plumbers Conference

https://lpc.events/
1•gregsadetsky•1h ago•0 comments

GPT-6.1 Terra vs. Claude Opus 5.5: Cheaper and faster in three tests at max

https://thenewstack.io/gpt-6-1-terra-vs-claude-opus-5-5/
1•runwithdata•1h ago•0 comments