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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!

AI has granted America new power

https://www.economist.com/leaders/2026/06/18/ai-has-granted-america-vast-new-power
1•andsoitis•16s ago•0 comments

Finally MCP's Tool Poisoning Gap Solved: A Protocol-Level Defense

https://github.com/modelcontextprotocol/modelcontextprotocol/discussions/2913
1•Raj_Sidwadkar•7m ago•0 comments

From Dream Job to 'The Gulag': Inside Staff Revolt Zuckerberg's Brutal AI Push

https://www.inc.com/bruce-crumley/from-dream-job-to-the-gulag-inside-the-meta-staff-revolt-over-z...
1•1vuio0pswjnm7•7m ago•0 comments

Datasette-apps: Apps that live inside Datasette

https://github.com/datasette/datasette-apps
2•doppp•15m ago•0 comments

Meta's AI agent for WhatsApp Business is now available globally

https://techcrunch.com/2026/06/03/metas-ai-agent-for-whatsapp-business-is-now-available-globally/
1•doppp•16m ago•0 comments

Datasette Apps: Host custom HTML applications inside Datasette

https://simonwillison.net/2026/Jun/18/datasette-apps/
8•lumpa•24m ago•1 comments

Observation is the layer under taste. We built it for AI runtime

https://twitter.com/damnventures/status/2067394719756251468
14•Cherepukhin•28m ago•0 comments

How to Build ChatGPT from Scratch: Understanding LLMs Step by Step

https://nextweekai.com/blog/build-chatgpt-from-scratch-guide/
1•javatuts•33m ago•0 comments

AI Governance Cannot Be a Tool Call

https://tenureai.dev/writing/ai-governance-cannot-be-a-tool-call/
4•jflynt76•37m ago•0 comments

Captcha audio going nuts (concerning) [video]

https://www.youtube.com/shorts/lbPwZyNsCR0
1•threaderr•37m ago•1 comments

What I Learned from Being Burned Alive

https://www.wsj.com/lifestyle/what-i-learned-from-being-burned-alive-95e91c88
3•Anon84•46m ago•1 comments

Meta lobbies Congress for protection from child-harm lawsuits

https://www.reuters.com/world/meta-lobbies-congress-protection-child-harm-lawsuits-2026-06-18/
7•jethronethro•48m ago•0 comments

1992 view of the problems of computer programming in 1992

https://blog.plover.com/2026/06/18/#fortran-i
3•tjwds•49m ago•0 comments

AI Holdouts in Tech Face 3 Times Higher Layoff Odds, Gallup Finds

https://finance.yahoo.com/technology/ai/articles/ai-holdouts-tech-face-3-095310222.html
3•littlexsparkee•56m ago•1 comments

Teen summer employment is headed for its worst year since 1948

https://fortune.com/2026/06/18/teen-summer-jobs-record-low-2026/
4•cheschire•57m ago•2 comments

Did Massachusetts Legalize Haggis?

https://www.cbsnews.com/boston/news/haggis-massachusetts-legal-scotland/
2•speckx•1h ago•0 comments

Writing Postcards with a 3D Printer

https://severinbucher.com/posts/writing-postcards-with-a-3d-printer/
3•typesafeJ•1h ago•0 comments

The Job Market Is Thawing

https://www.theatlantic.com/newsletters/2026/06/job-market-hiring-may/687640/
7•littlexsparkee•1h ago•1 comments

How Meter Pricing Is Testing the Economics of AI

https://www.bloomberg.com/news/articles/2026-06-18/ai-costs-what-shift-from-flat-rate-to-token-pr...
2•1vuio0pswjnm7•1h ago•0 comments

Mae vs. MSE: more than just the mean vs. median debate

https://idlemachines.co.uk/essays/mae-vs-mse
1•smaddrellmander•1h ago•0 comments

Show HN: Flashback – an agent skill that references 127 years of design trends

https://toby.github.io/flashback/
3•tobypadilla•1h ago•0 comments

Show HN: Drydock – VM Sandboxes for macOS Autonomous Coding Agents

https://github.com/sricola/drydock
1•sricola•1h ago•0 comments

Standout Startups from YC's Demo Day, According to VCs

https://techcrunch.com/2026/06/18/the-11-standout-startups-from-ycs-demo-day-according-to-vcs/
3•simonpure•1h ago•0 comments

College students are swapping coding for healthcare: Goldman Sachs

https://finance.yahoo.com/economy/article/college-students-are-swapping-coding-for-healthcare-gol...
2•gbourne1•1h ago•1 comments

GitLab 19.1

https://docs.gitlab.com/releases/19/gitlab-19-1-released/
3•ilreb•1h ago•0 comments

Waymo Recalling 3,800+ Robotaxis over Risk of Entering Construction Zones

https://www.wsj.com/business/autos/waymo-recalling-more-than-3-800-robotaxis-over-risk-of-enterin...
3•1vuio0pswjnm7•1h ago•0 comments

HN Returning "Sorry."

2•christopher8827•1h ago•2 comments

Can LLMs change the hiring economics of legacy engineers?

https://exhaustedmind.substack.com/p/ask-hn-can-llms-change-the-hiring
2•Psychoterapist•1h ago•0 comments

Show HN: AA-Briefcase: a frontier knowledge work evaluation

https://artificialanalysis.ai/articles/aa-briefcase
11•declanjackson•1h ago•2 comments

The effect of worked examples on learning solution steps and knowledge transfer

https://www.tandfonline.com/doi/full/10.1080/01443410.2023.2273762
1•indigodaddy•1h ago•0 comments