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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!

Red Teaming Would Fix Liberalism's Crisis

https://www.bloomberg.com/opinion/articles/2026-03-27/red-teaming-could-save-liberalism-from-its-...
2•petethomas•2m ago•0 comments

US Tech Companies Must Be Liable for Facilitating Persecution and Torture Abroad

https://www.eff.org/press/releases/us-tech-companies-must-be-accountable-us-courts-facilitating-p...
1•hn_acker•3m ago•1 comments

Mount any SEC EDGAR filer's complete filing history as a virtual filesystem

https://github.com/sampagon/edgar-mount
1•sampagon•4m ago•0 comments

CrackArmor: Critical AppArmor Flaws Enable Local Privilege Escalation to Root

https://blog.qualys.com/vulnerabilities-threat-research/2026/03/12/crackarmor-critical-apparmor-f...
1•type0•6m ago•0 comments

Moats, or castles in the air?

https://www.wsj.com/finance/investing/moats-or-castles-in-the-air-c6de3e56
1•hhs•7m ago•0 comments

Malicious IoliteLabs VSCode Extensions Target Solidity Developers with Backdoor

https://www.stepsecurity.io/blog/malicious-iolitelabs-vscode-extensions-target-solidity-developer...
2•kurmiashish•8m ago•0 comments

Alan Cache – the best caching library? (Part 1)

https://medium.com/alan/alan-cache-the-best-caching-library-part-1-e9e68ecf39dd
1•damsieboy•9m ago•0 comments

Show HN: Echoes of Deception

https://deception.madoke.org/
1•madoek•10m ago•0 comments

Building a Firewall via Endpoint Security?

https://objective-see.org/blog/blog_0x86.html
1•sashk•10m ago•0 comments

Researchers use quantum biosensors to peer into the inner workings of cells

https://artsci.washu.edu/ampersand/washu-researchers-use-quantum-biosensors-peer-inner-workings-l...
1•hhs•11m ago•0 comments

Post reporters called the White House. Their phones showed 'Epstein Island.'

https://www.washingtonpost.com/style/power/2026/03/27/white-house-google-database-epstein/
1•doener•13m ago•0 comments

Google warns quantum computers could hack encrypted systems by 2029

https://www.theguardian.com/technology/2026/mar/26/google-quantum-computers-crack-encryption-2029
1•doener•14m ago•0 comments

Exact Geometric Resolution of Cosmological Constant Problem: The Flat 3-Torus

https://zenodo.org/records/19241283
1•avonmach•19m ago•0 comments

Sashiko agentic Linux kernel code review system

https://github.com/sashiko-dev/sashiko
1•_____k•21m ago•0 comments

Engineers do get promoted for writing simple code

https://www.seangoedecke.com/simple-work-gets-rewarded/
1•aidenn0•21m ago•0 comments

SlopCodeBench: Benchmarking How Coding Agents Degrade over Long-Horizon Tasks

https://arxiv.org/abs/2603.24755
1•FiberBundle•26m ago•0 comments

Show HN: Show the ancestry of your code changes visually

https://www.codeboarding.org/diagrams
1•brovatten•26m ago•1 comments

Weak models excel at long context tasks

https://www.together.ai/blog/plan-divide-conquer
1•zagwdt•26m ago•0 comments

Both radiologists and AI struggle to identify 'deepfake' X-rays

https://radiologybusiness.com/topics/artificial-intelligence/both-radiologists-and-ai-struggle-id...
2•hhs•26m ago•0 comments

Ssereload(1) Introduction

https://timmarinin.net/2026/ssereload/
1•birdculture•27m ago•0 comments

Show HN: Multiplayer Local-First OpenClaw Native Mac App

https://clawcoda.com/
1•EthOptimist•28m ago•0 comments

Claude's popularity is forcing it to hit the brakes on users

https://www.businessinsider.com/claude-usage-caps-changes-popularity-anthropic-2026-3
1•almog•29m ago•0 comments

Software Performance Engineering: The Ideas I Keep Coming Back To

https://ricomariani.medium.com/software-performance-engineering-the-ideas-i-keep-coming-back-to-6...
1•cdrnsf•29m ago•0 comments

Dokis – Runtime RAG provenance enforcement without an LLM call

https://github.com/Vbj1808/dokis
1•Vbj1808•31m ago•0 comments

What if CRDTs for version control worked at entity granularity instead of lines?

1•rs545837•32m ago•0 comments

YouTube video uses the Klingon audio track to provide a Side B

https://www.youtube.com/shorts/I87xXqkbXMA
1•simonjgreen•34m ago•1 comments

Chat with multiple AI models at once

https://99helpers.com/tools/ai-chat
1•nickk81•37m ago•1 comments

Are We Approaching an Unprecedented Energy Crisis?

https://thedispatch.com/newsletter/dispatch-energy/iran-war-energy-crisis-hormuz/
1•simonebrunozzi•37m ago•0 comments

Sycophantic AI decreases prosocial intentions and promotes dependence

https://www.science.org/doi/10.1126/science.aec8352
1•salkahfi•38m ago•0 comments

The 24-year-old who wants to save the world in a home built prototype

https://www.topgear.com/car-news/interview/meet-24-year-old-who-wants-save-world-a-home-built-pro...
1•rmason•39m ago•0 comments