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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!

Anthropic launches $150M Claude Corps nonprofit fellowship program

https://qz.com/anthropic-claude-corps-fellowship-nonprofits-150-million-061126
1•01-_-•2m ago•0 comments

Ivanti Sentry pre-auth RCE (CVE-2026-10520) – CVSS 10.0, public PoC, CISA KEV

https://hellorecon.com/blog/cve-2026-10520
2•slvnx•4m ago•0 comments

Building a Personal RAG Chatbot in a Few Days

https://e-mahmoudi.me/blog/building-a-personal-rag-chatbot-in-a-few-days-learning-by-engineering/
1•jeyem•7m ago•1 comments

Show HN: A habit tracker for people who keep quitting their hobbies

https://streakup.pro/
1•mark_ka•7m ago•0 comments

How Diana Ross' 1994 opening ceremony penalty gaffe came about

https://www.telegraph.co.uk/football/2026/06/11/america-world-cup-opening-ceremony-diana-ross-pen...
1•austinallegro•8m ago•1 comments

When Weight-Loss Drugs Don't Work

https://www.nytimes.com/2026/03/12/well/weight-loss-drugs-response-wegovy-zepbound.html
1•paulpauper•8m ago•0 comments

Rust Programming Language learning roadmap

https://forwardevery.day/2024/03/26/rust-programming-language-learning-roadma/
1•mahirsaid•9m ago•0 comments

Building Hollywood Motion Capture from Scratch [video]

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

Several things I like about macOS 27 Golden Gate that have nothing to do with AI

https://arstechnica.com/gadgets/2026/06/five-things-i-like-and-one-thing-i-still-want-in-the-maco...
1•rbanffy•9m ago•0 comments

When we ask how to help

https://sheets.works/data-viz/how-to-help
1•structuredPizza•10m ago•0 comments

Please, Use a Link

https://idiallo.com/blog/use-a-link-please
3•foxfired•10m ago•0 comments

An Introduction to Quantitative Spatial Economics

https://nicholasdecker.substack.com/p/an-introduction-to-quantitative-spatial
2•paulpauper•14m ago•0 comments

Ekbatan – Java persistence framework for event-driven systems

https://zyraz-io.github.io/ekbatan/
2•unikzforce•14m ago•0 comments

Only Law Can Prevent Extinction

https://www.lesswrong.com/posts/5CfBDiQNg9upfipWk/only-law-can-prevent-extinction
2•paulpauper•14m ago•0 comments

California woman sentenced to 4 years in deadly OnlyFans fetish encounter

https://ktla.com/news/california/escondido-death-case-involuntary-manslaughter-plea/
2•Bender•15m ago•0 comments

ITScape: Guest-to-Host Escape in KVM/ARM64 (CVE-2026-46316)

https://seclists.org/oss-sec/2026/q2/877
2•Wingy•15m ago•0 comments

Watch seller robbed during SoCal Facebook Marketplace meetup

https://ktla.com/news/california/simi-valley-facebook-marketplace-robbery/
2•Bender•18m ago•0 comments

Canadian Privacy Commissioner Findings on X.ai/Grok CSAM Deepfake Violations

https://www.priv.gc.ca/en/opc-actions-and-decisions/investigations/investigations-into-businesses...
3•bparsons•18m ago•0 comments

Who Runs the Ransomware Group 'The Gentlemen?'

https://krebsonsecurity.com/2026/06/who-runs-the-ransomware-group-the-gentlemen/
3•Bender•19m ago•0 comments

Building a Deep Research Agent That Survives Its Own Failures

https://steel.dev/blog/durable-researcher
2•nkko•19m ago•0 comments

Kina, Kubernetes but Apple Containers

https://github.com/vinnie357/kina
2•cohix•20m ago•0 comments

Toward Generalist Autonomous Research via Hypothesis-Tree Refinement

https://huggingface.co/papers/2606.11926
1•laxmena•20m ago•0 comments

Agents-Container Running AI Agents Safely in Docker-in-Docker with GVisor

https://github.com/gni/agents-container
1•opensecurity•20m ago•0 comments

AI Coding Skill That May Make Your Coding Sessions 44% More Productive

https://vmysla.substack.com/p/ai-coding-skill-that-may-cut-your-ai-coding-costs-by-30-45-percent
1•vmysla•21m ago•0 comments

Best Composio Alternatives for MCP Gateway

https://www.arcade.dev/blog/composio-alternatives/
1•manveerc•21m ago•0 comments

Vector thinking for Max Profit (2022)

https://iabdb.me/2022/01/17/vector-thinking-for-max-profit/
1•tosh•24m ago•0 comments

UC to consider reinstating SAT after faculty say students are deficient in math

https://www.latimes.com/california/story/2026-06-11/uc-sat-act-test-requirement-admissions-recons...
3•apparent•25m ago•0 comments

Cheap Reward Hacking Detection

https://arxiv.org/abs/2606.08893
1•steven_pareto•27m ago•0 comments

Working in Glass

https://www.asimov.press/p/glass
1•bookofjoe•27m ago•0 comments

Poland to jail online streamers of violent crimes and cruelty for up to 5 years

https://www.reuters.com/business/media-telecom/poland-jail-online-streamers-violent-crime-rape-cr...
3•1659447091•28m ago•1 comments