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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•10mo 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!

Everyone is building the same thing (a generalist agent)

https://twitter.com/nichochar/status/2039739581772554549
1•nichochar•4s ago•0 comments

Analyzing 38,000 Dota games to see if this item helps [video]

https://www.youtube.com/watch?v=wYE3RUyzHlE
1•marysminefnuf•9m ago•0 comments

Cc-plugin-audit: Defensive supply-chain security analysis on plugin auto-update

https://github.com/STRML/cc-plugin-audit
1•Sottilde•10m ago•0 comments

The College Student–and His Cat Meme–Who Hunted the Biggest Cyberweapon

https://www.wsj.com/tech/kimwolf-hack-residential-proxy-networks-a712ab59
2•lakoshi•14m ago•0 comments

Change your Google Account username in a few simple steps

https://blog.google/products-and-platforms/products/workspace/google-account-username-change/
3•brie22•16m ago•0 comments

CDC Pauses Testing for Rabies and Pox Viruses

https://www.nytimes.com/2026/04/01/health/cdc-rabies-mpox-tests-paused.html
5•detaro•16m ago•1 comments

Being the Adult in the Room

https://tailscale.com/blog/adult-in-the-room
4•bumbledraven•20m ago•0 comments

Backblaze updated Terms of Service (2026)

https://www.backblaze.com/company/policy/terms-of-service-2026
3•anonred•21m ago•1 comments

US-Israeli bombing destroys oldest medical research center in Iran

https://www.egyptindependent.com/us-israeli-bombing-destroys-oldest-medical-research-center-in-ir...
12•OutOfHere•24m ago•1 comments

AI Applications and Vertical Integration

https://www.tanayj.com/p/ai-applications-and-vertical-integration
2•gmays•30m ago•0 comments

DropSmith – MCP server for structured NPC dialogue generation

https://github.com/holmesclaw-hash/dropsmith
3•dropsmith•35m ago•0 comments

Science confirms torpedo [baseball] bat works as well as regular bat

https://news.wsu.edu/press-release/2026/04/02/science-confirms-torpedo-bat-works-as-well-as-regul...
2•Magi604•37m ago•0 comments

Microsoft wants Edge to automatically open by default at Windows 11 boot

https://www.windowscentral.com/microsoft/windows-11/microsoft-wants-edge-to-automatically-open-by...
4•tech234a•37m ago•2 comments

EmDash Feedback

https://ma.tt/2026/04/emdash-feedback/
6•batuhanicoz•46m ago•0 comments

Any-GPU: my AMD 5700 XT OC can EARN IT's rent using Debian Trixie+Vulkan

https://github.com/cochranblock/any-gpu
2•cochranblock•47m ago•0 comments

Show HN: Procfile-compatible tool with hot reload, readiness, dependencies, etc.

https://github.com/alecthomas/proctor
2•alecthomas•48m ago•0 comments

Expi – Media Converter

https://getexpi.app
3•philematic•48m ago•0 comments

Trump administration sues 3 states over attempts to regulate prediction markets

https://www.npr.org/2026/04/02/nx-s1-5771635/trump-cftc-kalshi-polymarket-lawsuits
6•razorbeamz•50m ago•1 comments

Fine-Tuning Large Language Models LLMs with a Production-Grade Pipeline (2023)

https://alex000kim.com/posts/2023-09-08-finetune-llm-pipeline-dvc-skypilot/
2•teleforce•54m ago•0 comments

Leapstack-vn-data-breach-approximately-100-GB-of-health-insurance-claims

https://medium.com/@infosec_chu/leapstack-vn-data-breach-approximately-100-gb-of-health-insurance...
2•tryee•56m ago•0 comments

The Technocracy Movement of the 1930s

https://donotresearch.substack.com/p/welcome-to-the-technocracy
3•lazydogbrownfox•57m ago•0 comments

Period – 11M params car parking model

https://therefore.sh/projects/period
2•LorenDB•57m ago•0 comments

Untaxed Wealth of Richest 0.1% Is More Than Assets of World’s Poorest Half

https://www.commondreams.org/news/global-tax-havens-inequality
12•ZunarJ5•1h ago•2 comments

EPA Targets Microplastics and Drugs in Drinking Water

https://www.nytimes.com/2026/04/02/climate/microplastics-maha-epa.html
2•lxm•1h ago•0 comments

Jobs Being Created by AI

https://www.wsj.com/tech/ai/wanted-head-of-human-ai-solutions-the-new-jobs-being-created-by-ai-87...
3•Jimmc414•1h ago•0 comments

Ask HN: Can I say, "Thank You"?

4•ghastmaster•1h ago•0 comments

A tool to help product write better specs

https://www.clearspec.dev
2•mikopiko•1h ago•0 comments

The Unreasonable Effectiveness of Cash Transfers

https://nicholasdecker.substack.com/p/the-unreasonable-effectiveness-of
3•paulpauper•1h ago•0 comments

How to Mirror from Sourcehut to GitHub

https://timharek.no/blog/mirror-sourcehut-to-github/
3•netule•1h ago•0 comments

Every dependency you add is a supply chain attack waiting to happen

https://benhoyt.com/writings/dependencies/
5•signa11•1h ago•0 comments