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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!

Growing bread queues in Gaza as Israel restricts fuel, flour imports

https://www.aljazeera.com/news/2026/5/18/growing-bread-lines-gaza-israel-restricts-fuel-flour
1•hebelehubele•3m ago•0 comments

How Socialism Could Work

https://confrontingcapitalism.substack.com/p/how-socialism-could-really-work
1•avidphantasm•6m ago•1 comments

Iran invites CNN to show "a call to arms", arming and training 7-8 year olds

https://www.cnn.com/2026/05/18/world/video/iran-tehran-call-to-arms-chance-intldsk
1•spwa4•9m ago•0 comments

Rust: Project Goals Update

https://blog.rust-lang.org/2026/05/18/project-goals-2026-04/
1•f311a•9m ago•0 comments

Bito's AI Architect Boosts Claude Opus's task success rate by 35%

https://bito.ai/benchmarks/swe-bench-pro-evaluation/
1•Sushrutkm•16m ago•0 comments

All the a Trading Zone, and All the Languages Merely Pidgins

https://everythingstudies.com/2017/04/29/all-the-worlds-a-trading-zone/
1•paraschopra•17m ago•0 comments

How to Lose a Fight (skillfully) (2011)

https://expertboxing.com/how-to-lose-a-fight-skillfully
2•nephihaha•17m ago•0 comments

Hunting orphan objects: 45% off our ClickHouse storage bill and a near data-loss

https://www.tinybird.co/blog/how-we-deal-with-cloud-orphan-objects
1•gnzjgo•19m ago•0 comments

A detailed introduction to Kakoune for the aspiring power user

https://ficd.sh/blog/kakoune-is-a-text-editor/
1•birdculture•22m ago•0 comments

Collect as many lottery tickets as you can (2022)

https://adayeo.substack.com/p/collect-as-many-lottery-tickets-as
1•itzlambda•22m ago•0 comments

Open-Source Agentic QA Harness with Memory

https://github.com/vostride/agent-qa
13•pranshuchittora•25m ago•4 comments

I built a free Open Sourced, local audio stem separation

https://github.com/stemdeckapp/stemdeck
2•thclpr•26m ago•0 comments

More Tagged Union Subsets with Comptime in Zig

https://sinclairtarget.com/blog/2026/05/18/even-more-tagged-union-subsets-with-comptime/
1•xngbuilds•27m ago•0 comments

The small sample trap in A/B testing

https://hadid.dev/posts/averages-lie/
1•mustaphah•28m ago•0 comments

Secure Boot Certificate Expiry (Windows and Linux)

https://www.youtube.com/watch?v=_AwzaZmRNsI
1•nullpwr•31m ago•0 comments

The Windows DLL loader lock: how a Rust thread can hang your JVM

https://questdb.com/blog/windows-dll-loader-lock-rust-jni-deadlock/
2•bluestreak•32m ago•0 comments

Prejudice and truth about the effect of testosterone on bargaining behaviour

https://www.nature.com/articles/nature08711
1•mpweiher•36m ago•0 comments

MCP Tool Routing Has a Security Problem Nobody Is Talking About

https://medium.com/@will.jh75/the-hidden-flaws-of-mcp-routing-and-why-we-need-to-talk-about-them-...
1•rogueparticle•36m ago•0 comments

Show HN: Blog post and slideshow automatic generator

https://slidio.xyz/
1•oyaa52•38m ago•0 comments

Bournegol???

https://oldhome.schmorp.de/marc/bournegol.html
1•greyface-•45m ago•0 comments

Blog post: why and how we built local-first with Zero (prev. Replicache)

https://ano.chat/blog/why-we-built-ano-on-zero
1•bill-cupid•46m ago•0 comments

What changes when AI reads you first

https://onomeokajevo.substack.com/p/stop-telling-ai-to-sound-like-you
1•snoren•47m ago•0 comments

One Mars spacecraft, two senators, and a cloud of questions

https://arstechnica.com/space/2026/05/one-mars-spacecraft-two-senators-and-a-cloud-of-questions/
1•rbanffy•47m ago•0 comments

Do you value tight machining in everyday carry knives?

https://www.paragon-knives.com/
1•bgzlsxaz•47m ago•0 comments

Show HN: Resilient, A composable async resilience toolkit for rust

https://github.com/resilient-rs/resilient
2•yofabr•48m ago•0 comments

Extensy – turn any prompt into a monetizable browser extension in 2 minutes

https://extensy.dev/
5•truetemir•51m ago•1 comments

Unprecedented 19 Day Type IV Radio Burst as a Corotating Electron Reservoir

https://iopscience.iop.org/article/10.3847/2041-8213/ae5537
1•fodmap•56m ago•0 comments

Social Media Zero (2017)

https://leejo.github.io/2017/09/27/social_media_zero/
2•chistev•56m ago•0 comments

The US space enterprise is desperately waiting for Starship–will it deliver?

https://arstechnica.com/space/2026/05/the-us-space-enterprise-is-desperately-waiting-for-starship...
2•rbanffy•57m ago•1 comments

I've created a platform where sites get paid not to show ads

https://medium.com/@laurynas.karvelis_95228/is-monetising-your-site-possible-without-serving-ads-...
2•luggage_bazooka•59m ago•0 comments