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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•9mo 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!

Show HN: CRTX – AI code gen that tests and fixes its own output (OSS)

https://github.com/CRTXAI/CRTX
1•johnnycash926•31s ago•0 comments

US 500 Excluding Artificial Intelligence Enablers Price Return Index

https://www.google.com/finance/quote/SPXXAI:INDEXCME
3•mattas•5m ago•0 comments

Show HN: Check iOS Cert Status via our easy to use API

https://novadev.vip/api/
2•SuperGamer474•6m ago•0 comments

A war foretold:how the CIA and MI6 got hold of Putin's Ukraine plans and why

https://www.theguardian.com/world/ng-interactive/2026/feb/20/a-war-foretold-cia-mi6-putin-ukraine...
2•geoka9•9m ago•0 comments

The coding agent is dead

https://ampcode.com/news/the-coding-agent-is-dead
2•ElasticBottle•11m ago•0 comments

Klarna's shift to AI agents threatens traditional SaaS valuations

https://roundly.io/blog/klarna-ai-agents-replacing-saas
2•roundly_io•14m ago•1 comments

Show HN: YAML-schema-router – content-based schema routing for yaml ls

https://github.com/traiproject/yaml-schema-router
2•drLuca•19m ago•1 comments

Show HN: TypstMe – Build ATS-proof resumes using Typst and WASM

2•yoangilliand•21m ago•0 comments

Ask HN: Can RAG be used for recommendation system?

2•pinner•25m ago•0 comments

Ask HN: What happens to all the hardware when data centers upgrade?

3•givemeethekeys•25m ago•0 comments

CSLib: A Focused Effort on Formalizing Computer Science in Lean

https://www.cslib.io/
2•md224•26m ago•0 comments

Steve Webber on Multics

https://www.youtube.com/watch?v=0gzjrF9r6QA
2•twoodfin•27m ago•0 comments

Unlocking full-body human motor learning at scale

https://amathislab.github.io/mm-blog/
2•moatmoat•27m ago•0 comments

A Bollywood Spy Thriller Crosses the India-Pakistan Divide

https://www.bloomberg.com/news/articles/2026-02-20/bollywood-epic-dhurandhar-breaks-records-in-in...
2•petethomas•28m ago•0 comments

Show HN: Velo – Open-source, keyboard-first email client in Tauri and Rust

3•Espired•36m ago•0 comments

If Chatbots Can Replace Writers, It's Because We Made Writing Replaceable

https://thewalrus.ca/if-chatbots-can-replace-writers-its-because-we-made-writing-replaceable/
4•eon01•36m ago•0 comments

What Is OAuth?

https://leaflet.pub/p/did:plc:3vdrgzr2zybocs45yfhcr6ur/3mfd2oxx5v22b
9•cratermoon•36m ago•0 comments

Napkin Math

https://github.com/sirupsen/napkin-math
3•fagnerbrack•37m ago•0 comments

The Rise and Fall of Scala: A Love Letter to the Language That Broke My Heart

https://medium.com/@naveensky/the-language-that-made-me-feel-like-a-genius-until-it-didnt-my-brea...
3•b-man•40m ago•0 comments

Cord: Coordinating Trees of AI Agents

https://www.june.kim/cord
12•gfortaine•42m ago•0 comments

Heaven Has a Physical Location, a Physicist Claims

https://www.popularmechanics.com/science/a70423234/location-of-heaven/
3•nikolay•44m ago•3 comments

Facebook Is Doing A-Okay

5•givemeethekeys•45m ago•2 comments

Show HN: Share Your Ideas with the Community

https://novadev.vip/share/
2•SuperGamer474•46m ago•0 comments

Precise exceptions in relaxed architectures [video]

https://www.youtube.com/watch?v=JkNgZz4bu1E
2•matt_d•52m ago•1 comments

An Archaeological Dig Through the Extropian Archives

https://mtabarrok.com/extropia-archaeology
2•jdkee•52m ago•0 comments

India's Sarvam 105B LLM tops OCR benchmarks

https://timesofindia.indiatimes.com/technology/tech-news/explained-what-is-indias-sarvam-ai-model...
2•dyauspitr•53m ago•0 comments

Show HN: I created a beautiful number animation library for React Native

https://number-flow-react-native.awingender.com/
2•WingenderA•54m ago•0 comments

Correcting the Financial Times Report about AWS, Kiro, and AI

https://www.aboutamazon.com/news/aws/aws-service-outage-ai-bot-kiro
2•nonfamous•55m ago•0 comments

Show HN: I built a 55K-word email marketing knowledge base and Claude Code skill

https://www.emailmarketingskill.com/
3•cosmoblk•1h ago•0 comments

Little PAIPer – Learn computer science through Peter Norvig's teachings

https://lilpaiper.ai
2•vismit2000•1h ago•0 comments