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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!

New

1•bebaeshetu•1m ago•0 comments

Show HN: Dropshot – built a browser tool for animated product shots

https://www.usedropshot.com/
1•antoninkus•2m ago•1 comments

Live Translation, Running in the Browser

https://artisincode.com/essays/live-translation-right-in-the-browser/
1•parentheses•3m ago•1 comments

How HN: YouDeserveNow – An AI enabler that rationalizes your impulse buys

https://www.youdeservenow.com
1•oneprofiledev•3m ago•0 comments

The Vercel breach: OAuth attack exposes risk in platform environment variables

https://www.trendmicro.com/en_us/research/26/d/vercel-breach-oauth-supply-chain.html
3•queenelvis•3m ago•0 comments

Ibuilt a tiny Unix‑like 'OS' with shell and filesystem for Arduino UNO (2KB RAM)

https://github.com/Arc1011/KernelUNO
1•Arc1011•3m ago•0 comments

FastVLA – Training 7B Robotics Policies for $0.48/HR on Nvidia T4/L4

https://github.com/BouajilaHamza/fastvla
1•hamzabouajila•4m ago•0 comments

Show HN: TickerDB – pre-computed market context for agents

https://tickerdb.com/playground
1•wolfman1•4m ago•0 comments

Work with the Garage Door Up

https://notes.andymatuschak.org/Work_with_the_garage_door_up
1•jxmorris12•4m ago•0 comments

Long-term cigarette butts' decomposition over 10 years

https://www.sciencedirect.com/science/article/abs/pii/S0269749126003143
1•PaulHoule•5m ago•0 comments

Mind the van Emden Gap

https://blog.fogus.me/llm/van-emden.html
1•adityaathalye•7m ago•0 comments

Resolution Challenge

https://rico.ibs.fr/helixplorer/resolution/
1•ray__•8m ago•0 comments

SpaceX president Shotwell earned $85M last year, document shows

https://www.reuters.com/world/spacex-president-shotwell-earned-85-million-last-year-document-show...
2•1vuio0pswjnm7•9m ago•0 comments

Ordering with the Starbucks ChatGPT app was a true coffee nightmare

https://www.theverge.com/ai-artificial-intelligence/915821/starbucks-chatgpt-app-testing
1•mattas•9m ago•0 comments

The Simpsons Hit and Run Ported to WebAssembly and WebGL

https://shar-wasm.cjoseph.workers.dev/?skipfe&l1&m1&autostartmission
1•calebj0seph•9m ago•1 comments

Musk bought $1.4B SpaceX shares last year, The Information reports

https://www.reuters.com/technology/musk-bought-14-billion-spacex-shares-last-year-information-rep...
1•1vuio0pswjnm7•10m ago•0 comments

The largest randomized controlled trial of leading longevity drug is underway

https://www.gethealthspan.com/research/article/human-rapamycin-trial-longevity-evidence
3•dtawfik1•10m ago•0 comments

The Download: turning down human noise, and LA's subway upgrade

https://www.technologyreview.com/2026/04/21/1136246/the-download-human-noise-la-subway-upgrade/
1•joozio•10m ago•0 comments

Show HN: GBS Music – web based, open source Game Boy music editor/tracker

1•chrismaltby•10m ago•0 comments

Show HN: Hands-on x86-64 page table walk:finding a flag in physical RAM with GDB

https://github.com/jazho76/page_table_walk
1•jazho76•10m ago•0 comments

Flow Control Is an Architectural Decision (Not a Performance Optimization)

https://www.synadia.com/blog/nats-edge-event-architecture-4-flow-control-is-an-architectural-deci...
1•jonzu•11m ago•0 comments

More than 20 organic compounds found on Mars – many for the first time

https://www.chemistryworld.com/news/more-than-20-organic-compounds-found-on-mars-many-for-the-fir...
1•crescit_eundo•11m ago•1 comments

Ask HN: How much are you making?

1•downbad_•11m ago•1 comments

The Wharton Blueprint for AI Agent Adoption

https://knowledge.wharton.upenn.edu/special-report/wharton-blueprint-ai-agent-adoption/
1•gmays•12m ago•1 comments

A Fast Quicksort for Modern CPUs with Threads and Branch‑Avoidant Partitioning

https://easylang.online/blog/threaded_sorting
1•signa11•12m ago•0 comments

Show HN: A static website that looks and feels as a shell

https://github.com/jazho76/shellwebsite
1•jazho76•12m ago•0 comments

In-situ electron microscopy probes how atoms adsorb on surfaces at solid–liquid

https://www.chemistryworld.com/news/in-situ-electron-microscopy-probes-how-atoms-adsorb-on-surfac...
1•crescit_eundo•12m ago•2 comments

'People still remember it 40 years later': the making of Chuckie Egg

https://www.theguardian.com/games/2026/apr/21/in-my-mind-it-was-just-tall-birds-wandering-around-...
1•stevekemp•14m ago•0 comments

The Vercel and Context AI breach: an AI supply chain attack, step by step

https://www.reco.ai/blog/vercel-context-ai-breach
1•llmacpu•14m ago•0 comments

Kill Your MCP Servers

https://anonjon.substack.com/p/kill-your-mcp-servers
1•An0n_Jon•15m ago•0 comments