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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!

The Best Sandwich in Every State (2021)

https://www.foodandwine.com/travel/restaurants/best-sandwich-america-every-state
1•mooreds•1m ago•0 comments

Don't Get in a Crash in a Cybercab

https://schwarztech.net/snippets/dont-get-in-a-crash-in-a-cybercab
2•speckx•2m ago•0 comments

Show HN: PromptSign – Sigstore signing and verification for AI instruction files

https://promptsign.ai/
1•sergey_v•3m ago•0 comments

The Magic Behind Cubacadabra

https://andrewarrow.dev/2026/moon/2/day/19/the-magic-behind-cubacadabra/
2•andrewfromx•4m ago•0 comments

AgentLaws – Govern Agents Through Prompts Organized Like Law

https://github.com/shrsv/AgentLaws
1•atomicnature•4m ago•0 comments

Show HN: Raiders at the Gate – tower defense web game

https://games.chrisbeach.co.uk/raiders-at-the-gate/
1•cbeach•9m ago•0 comments

In search of the hypothetical iPhone Duo buyer

https://manualdousuario.net/en/iphone-duo-who-buys-foldable-phones/
1•rpgbr•10m ago•0 comments

Show HN: Ecommerce Search comparisson across 5 independent engines, all public

https://github.com/quissly/search-benchmark
1•tazo-lezhava•10m ago•1 comments

Custom AMOLED Wearable Makes Great Icebreaker

https://www.scd31.com/posts/defcon-choker
1•SamuraiLion•12m ago•0 comments

What Happened at the White House That Marc Andreessen Says Sent Him to Trump

https://www.politico.com/news/magazine/2026/09/10/marc-andreessen-trump-biden-ai-opinion-01045516
3•mmayberry•13m ago•1 comments

Linus's Law

https://en.wikipedia.org/wiki/Linus%27s_law
1•gchamonlive•13m ago•1 comments

Study: A burst of "pink noise" may lead to more restorative sleep

https://news.mit.edu/2026/pink-noise-burst-may-mean-more-restorative-sleep-0909
2•giuliomagnifico•13m ago•0 comments

ChatGPT for Financial Services

https://openai.com/index/introducing-chatgpt-financial-services/
1•skogstokig•14m ago•1 comments

Life as a Terrorist: Uncovering my FBI file (2013)

https://harpers.org/archive/2013/09/life-as-a-terrorist/
2•cocacola1•15m ago•0 comments

Mischievous AIs

https://www.strangeintelligence.ai/mischievous-ais
2•randomparticlez•15m ago•0 comments

Study confirms permanent loss of Canada's last Arctic epishelf lake

https://news.ubc.ca/2026/09/study-confirms-permanent-loss-of-canadas-last-arctic-epishelf-lake/
1•rdmuser•19m ago•1 comments

Show HN: Biff 2.0 (Clojure web framework)

https://biffweb.com
1•jacobobryant•20m ago•0 comments

X-HBM – 16X more bandwidth or 10x higher density than traditional HBM (2025) [pdf]

https://neosemic.com/wp-content/uploads/2025/09/X-HBM_Brochure.pdf
1•peter_d_sherman•20m ago•0 comments

Oslo bans smart glasses in schools

https://www.thelocal.no/20260910/oslo-bans-smart-glasses-in-schools
3•vinni2•21m ago•0 comments

How do you keep up HN post with more than 2K comments?

1•pablogancharov•22m ago•3 comments

An Engineer's Guide to Surviving a Layoff

https://spectrum.ieee.org/how-to-survive-a-layoff
1•Brajeshwar•22m ago•0 comments

Stabilization Progress of Rust Allocators

https://cetra3.github.io/blog/state-of-allocators-2026-part-2/
1•fanf2•24m ago•0 comments

Ask HN: Would you pay to have your favorite AI agents in one app?

1•balgeman•24m ago•0 comments

What Comes After Git

https://ersc.io/blog/what-comes-after-git
9•steveklabnik•24m ago•0 comments

Bad Vibes Coding

https://spectrecollie.com/2026/09/05/bad-vibes-coding/
1•BrunoBernardino•25m ago•0 comments

Runnable – CI That Speaks Actions (Entire and GitHub)

https://runnable.cloud
1•melkor7•25m ago•0 comments

Writing in 2026: Wherein Claude Voice infects the universe

https://craigmod.com/roden/118/
1•decimalenough•25m ago•0 comments

People's Old Saves Kinda Make Me Sad

https://blog.absurdpirate.com/peoples-old-saves-kinda-make-me-sad/
2•speckx•25m ago•0 comments

OpenAI's research is too important to be turned into propaganda

https://www.modelrepublic.org/articles/openai-research-propaganda
1•cdrnsf•26m ago•0 comments

We Managed an Engineering Reliability Crisis

https://theengineeringmanager.substack.com/p/code-yellow-code-red
1•AntonZ234•26m ago•0 comments