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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!

ShowHN: Xata, open-source Postgres platform with copy-on-write branches

https://github.com/xataio/xata
1•tudorg•40s ago•0 comments

Gemini can now create personalized AI images by digging around in Google Photos

https://arstechnica.com/ai/2026/04/gemini-can-now-create-personalized-ai-images-by-digging-around...
1•gpi•1m ago•0 comments

Claude Code injects hidden prompts into file reads to stop malware tweaks

https://twitter.com/adrian_cooney/status/2044827025379123597
1•adriancooney•2m ago•0 comments

Many-Step Sequences in Go

https://lesiw.dev/go/step/
1•zimpenfish•4m ago•0 comments

How to burn $30M on a JavaScript framework [video]

https://www.youtube.com/watch?v=ReAnFFqvCeA
1•PaulHoule•4m ago•0 comments

I Didn't Have the Markdown Editor I Wanted So I Vibecoded One in a Weekend

https://app.clarus.page/s/ead7fca03a9c40d2a4134cb8536f0332
3•jimjeffers•4m ago•1 comments

Nyquest – Open-source LLM token compression proxy in Rust (15–75% savings)

https://github.com/Nyquest-ai/nyquest-rust-fullstack-pub
1•256kmagic•6m ago•0 comments

What Are Skiplists Good For?

https://antithesis.com/blog/2026/skiptrees/
2•tanelpoder•6m ago•0 comments

Stop Using Toilet Paper

https://www.nytimes.com/2020/04/03/opinion/toilet-paper-hoarding-bidets.html
1•Anon84•7m ago•0 comments

Bypassing the kernel for 56ns cross-language IPC

https://github.com/riyaneel/Tachyon/tree/main/docs/adr
1•riyaneel•7m ago•0 comments

An Investor Dared Him to Quit School. Now He's Building a $1.5B AI Startup

https://www.wsj.com/tech/ai/an-investor-dared-him-to-quit-school-now-hes-building-a-1-5-billion-a...
2•kstrauser•7m ago•0 comments

Is Carbon Removal in Trouble?

https://www.technologyreview.com/2026/04/16/1135928/carbon-removal-microsoft/
1•Brajeshwar•7m ago•1 comments

Newton Diameters

https://www.johndcook.com/blog/2026/04/16/newton-diameters/
2•ibobev•7m ago•0 comments

Where the DOGE Operatives Are Now

https://www.wired.com/story/where-the-doge-operatives-are-now/
5•droidjj•7m ago•0 comments

Codex for Almost Everything

https://openai.com/index/codex-for-almost-everything/
29•mikeevans•8m ago•2 comments

Clojure on Fennel part two: immutable.fnl optimizations

https://andreyor.st/posts/2026-04-15-clojure-on-fennel-part-two-immutablefnl-optimizations/
2•ibobev•8m ago•0 comments

How to Automate Screenshot Naming on macOS Using AI

https://asleepace.com/blog/how-to-automate-screenshot-naming-macos/
2•asleepace•9m ago•1 comments

Pointer-Stable Dynamic Arrays

https://vectrx.substack.com/p/pointer-stable-dynamic-arrays
1•ibobev•9m ago•0 comments

Digital Tap AI: OSS agents to detect and stop idle cloud clusters

https://github.com/CruiseAI/digitaltap-oss
1•digitaltap•9m ago•0 comments

The People's Clock: A Timepiece Made of People

https://kottke.org/26/04/the-peoples-clock
2•evo_9•9m ago•0 comments

"Relative State" Formulation of Quantum Mechanics (1957)

https://web.archive.org/web/20111027191052/http://www.univer.omsk.su/omsk/Sci/Everett/paper1957.html
1•bookofjoe•9m ago•0 comments

AI that breaks, writes down why, and fixes itself by morning

https://duncangwood.substack.com/p/ai-that-breaks-writes-down-why-and
1•duncanwood•10m ago•0 comments

Agile Case Study: Designing Large-Scale Software for Reuse with an Auto Company

https://www.aptiv.com/en/insights/article/designing-large-scale-software-for-reuse-with-an-automo...
1•ohjeez•11m ago•0 comments

The iPhone Air was set up to fail, but it's still my favorite phone

https://starikov.co/iphone-air/
2•iusevim•12m ago•0 comments

Mastodon: Don't use "Mastodon" or "mstdn" in domain names

https://github.com/mastodon/mastodon/discussions/22785
3•kenniskrag•15m ago•2 comments

Making AI operational in constrained public sector environments

https://www.technologyreview.com/2026/04/16/1135216/making-ai-operational-in-constrained-public-s...
1•joozio•17m ago•0 comments

Show HN: Blades CSS – Framework-agnostic, class-light CSS⁺ kit inspired by Pico

https://github.com/anyblades/blades
1•anydigital•18m ago•0 comments

How GitHub uses eBPF to improve deployment safety

https://github.blog/engineering/infrastructure/how-github-uses-ebpf-to-improve-deployment-safety/
1•chmaynard•19m ago•0 comments

Music Millennium Cancels Listening Party After AI Backlash

https://www.wweek.com/music/2026/04/14/music-millennium-cancels-listening-party-after-ai-backlash/
3•cdrnsf•20m ago•0 comments

My experience with Claude and Codex on a system architecture bug

https://swaranga.dev/posts/claude-vs-codex-on-a-system-architecture-bug/
1•swaranga•20m ago•0 comments