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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!

Everyone has ADHD because we made it up

https://neubroscience.substack.com/p/everyone-has-adhd-because-we-made
1•bushwart•53s ago•0 comments

EU parliament compromises in Chat Control, mass search of private messages [pdf]

https://www.patrick-breyer.de/wp-content/uploads/2026/09/st13158_en26.pdf
1•miohtama•1m ago•0 comments

NOTE4 – a $55 ESP32 S3 e-ink task display with open API's

https://zectrix.com/en/note4.html
1•abdullahalharir•3m ago•0 comments

Carp in Glamorous Toolkit

https://blog.veitheller.de/Carp_in_Glamorous_Toolkit.html
2•hellerve•3m ago•0 comments

Lean formalization of the Hamilton-Perelman proof of the Poincaré conjecture

https://github.com/qinz1yang/differential-geometry
1•nill0•5m ago•1 comments

Understanding LLMs with an Interactive Tutorial

https://thousandmiles-ai.github.io/open-the-black-box-how-llms-actually-work.html
3•vrnithinkumar•5m ago•0 comments

Nodd – Tiny, use-case-specific decision models that can run in browser

https://michaljach.github.io/nodd/
1•yaszko•7m ago•0 comments

The Extinction Risk from Artificial Intelligence [pdf]

https://www.rand.org/content/dam/rand/pubs/research_reports/RRA3000/RRA3034-1/RAND_RRA3034-1.pdf
1•djoldman•7m ago•0 comments

The operating system for your service business

https://www.syniqsolutions.co.za/business-os
1•mikhaila•8m ago•0 comments

Kubernetes Security Best Practices

https://mobilestuff2026.blogspot.com/2026/09/linux-server-hardening-best-practices.html
1•techGuardpro•12m ago•0 comments

Tesla workers balk at training Optimus humanoid robots as replacements

https://arstechnica.com/ai/2026/09/tesla-workers-balk-at-training-optimus-humanoid-robots-as-repl...
1•pseudolus•12m ago•0 comments

Six Selfish Reasons to Have Kids

https://kevinkelly.substack.com/p/six-selfish-reasons-to-have-kids
1•yarapavan•12m ago•0 comments

2026 in LLMs (So Far)

https://simonwillison.net/2026/Sep/27/2026-in-llms-so-far/
1•lumpa•15m ago•0 comments

Rails World 2026 Closing Keynote – Aaron Patterson [video]

https://www.youtube.com/watch?v=t0knYnEYBRo
2•sinnsro•15m ago•0 comments

Falsehoods programmers believe about time and time zones

http://www.creativedeletion.com/2015/01/28/falsehoods-programmers-date-time-zones.html
2•ghassenfaidi•16m ago•0 comments

Controversial Sydney data centre project pulled amid community anger

https://www.abc.net.au/news/2026-09-28/lane-cove-ai-data-centre-plans-abandoned-by-goodman-group/...
1•Alien1Being•17m ago•1 comments

What Would a Serious AI Product Look Like?

https://blog.glyph.im/2026/09/serious-ai-product.html
1•lumpa•17m ago•0 comments

Who's liable when AI agents go rogue?

https://www.technologyreview.com/2026/09/28/1145197/whos-liable-when-ai-agents-go-rogue/
1•joozio•17m ago•0 comments

"We clearly handled that responsibility poorly": Paradox ban Discord profile

https://www.rockpapershotgun.com/we-clearly-handled-that-responsibility-poorly-paradox-ban-discor...
2•Tomte•18m ago•0 comments

Natural Selection Favors AIs over Humans (2023)

https://arxiv.org/abs/2303.16200
1•throw0101a•18m ago•1 comments

It's Time to Investigate the AI Labs

https://calnewport.com/its-time-to-investigate-the-ai-labs/
2•tolugenius•18m ago•0 comments

Show HN: Cafca – a synthetic face dataset with 1.75M images

https://syntec-research.github.io/Cafca/cafca_dataset.html
1•mcbuehler•22m ago•0 comments

Scuola

2•ArthurFischerp•23m ago•0 comments

I benchmarked a TDD-enforcing Claude Code plugin. It didn't write better code

https://www.maxtaylor.me/articles/i-benchmarked-tdd-guard-it-didn-t-write-better-code
1•max-t-dev•23m ago•0 comments

TimeLord: Choose Your Random Future

https://github.com/frazerpearce/TimeLord
1•wrxd•24m ago•0 comments

Robots Have No Voice

https://randsinrepose.com/archives/robots-have-no-voice/
1•speckx•25m ago•1 comments

Philbin: The safest (and fastest) AEGIS library

https://val.markovic.io/articles/philbin-the-safest-and-fastest-aegis-library
1•syncontrol•26m ago•0 comments

The systems that no one will test

https://blog.christianperone.com/2026/09/the-systems-that-no-one-will-test/
1•perone•27m ago•0 comments

Guide to Investigating Tech and AI in Modern Warfare

https://gijn.org/resource/investigate-tech-ai-modern-warfare/
3•robtherobber•28m ago•0 comments

Show HN: Yaystack.ch, check whether AI answer engines can see your website

https://yaystack.ch/
1•shipcraft•29m ago•0 comments