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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•11mo 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!

AI agent for querying and understanding Git activity in real time

https://gitmore.io
1•ahmedktata•50s ago•0 comments

Canopy Fracturing System

https://twitter.com/i/status/2043646152457998710
1•Michelangelo11•1m ago•0 comments

Ultrasonic Welding of Garnet Solid Electrolytes to Lithium Metal

https://dx.doi.org/10.1002/sstr.202500866
2•PaulHoule•2m ago•0 comments

AI Changed How We Build. It Did Not Change What Matters

https://piljoong.dev/posts/ai-changed-how-we-build/
1•piljoong•3m ago•1 comments

A back end where you never need migrations or authorization code

https://www.monsterwriter.com/building-linkedrecords.html
1•WolfOliver•3m ago•0 comments

Who's Been Impersonating This ProPublica Reporter?

https://www.propublica.org/article/impersonating-propublica-reporter
1•hn_acker•4m ago•0 comments

Data on over 100 companies hiring remote software engineers

https://github.com/simoncrowe/remote-tech-companies
1•corvus-cornix•4m ago•1 comments

Ask HN: Cryptocurrency (Monero) payment provider recommendations?

1•BrunoBernardino•4m ago•0 comments

Show HN: Open-source strategy that placed #2 in a prediction market challenge

https://github.com/octavi42/prediction-market-maker
1•tav1•5m ago•0 comments

US pharma firm gets €922M "innovation" tax break in NL

https://www.dutchnews.nl/2026/04/us-pharma-firm-gets-e922-million-innovation-tax-break-in-nl/
1•sixhobbits•5m ago•0 comments

Microwave Cruicble

https://hackaday.com/2025/02/12/diy-microwave-crucibles/
1•user070223•5m ago•1 comments

RemoteYeah: 100% remote engineering jobs, back-end, front-end, full-stack

https://remoteyeah.com
1•sevcikdev•6m ago•0 comments

Pokemon Evolution vs Darwinian Evolution

https://superheroetc.wordpress.com/2017/05/31/pokemon-evolution-vs-darwinian-evolution/
1•barbazoo•6m ago•0 comments

The Cox Shock: A Tectonic Shift or Just a Tremor?

https://blog.ericgoldman.org/archives/2026/04/the-cox-shock-a-tectonic-shift-or-just-a-tremor-gue...
1•hn_acker•7m ago•0 comments

Linux rules on using AI-code: Copilot is OK, humans to take full responsibility

https://www.techradar.com/pro/linux-rules-on-using-ai-generated-code-copilot-is-ok-but-humans-mus...
1•losgehts•7m ago•0 comments

With Massachusetts v. Meta, Congress Doesn't Need to Repeal Section 230

https://blog.ericgoldman.org/archives/2026/04/with-opinions-like-this-congress-doesnt-need-to-rep...
2•hn_acker•7m ago•1 comments

Lean proved this program was correct; then I found a bug

https://kirancodes.me/posts/log-who-watches-the-watchers.html
2•gopiandcode•9m ago•0 comments

Missouri town fires half its city council over data center deal

https://www.politico.com/news/2026/04/13/missouri-city-council-data-center-00867259
2•impish9208•9m ago•0 comments

An AI that researches the web before generating images

https://firethering.com/gen-searcher-open-source-image-generation/
1•steveharing1•10m ago•0 comments

Roblox to introduce age-based accounts in latest effort to shore up safety

https://www.cbsnews.com/news/roblox-age-based-accounts-kids-safety-controls/
2•rolph•10m ago•0 comments

To flexibly organize thought, the brain makes use of space

https://picower.mit.edu/news/flexibly-organize-thought-brain-makes-use-space
1•geox•10m ago•0 comments

Booking.com warns reservation data may have checked out with intruders

https://www.theregister.com/2026/04/13/bookingcom_breach/
1•Bender•10m ago•0 comments

Meta spins up AI version of Mark Zuckerberg to engage with employees

https://arstechnica.com/ai/2026/04/meta-spins-up-ai-version-of-mark-zuckerberg-to-engage-with-emp...
1•Bender•11m ago•0 comments

OpenStickies – Free Sticky Notes App for Windows, Linux and macOS

https://openstickies.com/
1•lsferreira42•11m ago•0 comments

I'm building an AI agent that learns from every task

https://github.com/prathyushnallamothu/nexus
1•prathyush27•12m ago•0 comments

iMessage for Agents for free with 2 CLI commands

https://twitter.com/nikita_builds/status/2037220813888176563
1•coozamano2•13m ago•0 comments

Show HN: Girlfriend in CLI – AI-native persona harness for social training

https://github.com/NomaDamas/girlfriend-in-cli
1•minsingjin•14m ago•0 comments

See how your website ranks with AI and Google

https://arlocmo.site
2•decentrowe•15m ago•0 comments

Income tax will be dead within five years as AI jobs crisis grows

https://www.lbc.co.uk/article/income-tax-dead-five-years-ai-jobs-crisis-5HjdXdg_2/
3•01-_-•15m ago•0 comments

All Radar, No Compass - On Performing, Being, and the "Minds" We're Building

https://outofdesk.blog/all-radar-no-compass
2•ggauravr•15m ago•0 comments